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Tooth impaction

Tooth impaction is a dental condition in which a tooth fails to fully erupt into its proper position within the dental arch, becoming embedded in the surrounding soft tissues or jawbone due to physical obstruction or insufficient space.^[1] This phenomenon most commonly affects the third molars (wisdom teeth), with it estimated that more than 70% of adults have at least one impacted wisdom tooth, though it can also involve other teeth such as canines or premolars.^[2] Impacted teeth may remain asymptomatic for years or lead to various oral health issues if untreated.^[3] Impactions occur in 16.7% to 68.6% of the population globally, varying by region, population, and tooth type, with mandibular third molars being the most frequently affected and a slightly higher incidence in females.^[4]

Introduction

Definition and Overview

Tooth impaction is defined as a pathological condition in which a tooth fails to erupt into its normal functional position within the expected developmental timeframe, resulting in the tooth remaining partially or fully embedded in the jawbone or surrounding soft tissue.^[5] This failure disrupts the normal eruption process, where teeth typically emerge from the alveolar bone into the oral cavity to align properly in the dental arch.^[6] The basic mechanism of tooth impaction involves interference with the eruption pathway, often due to a physical barrier such as insufficient space in the dental arch, obstruction by adjacent teeth or dense bone, or an abnormal developmental trajectory that leads to the tooth becoming entrapped.^[1] These barriers prevent the tooth from moving vertically and horizontally as required for proper alignment, potentially causing it to tilt, rotate, or remain submerged.^[7] Impaction most commonly affects third molars, also known as wisdom teeth, which are expected to erupt between the ages of 17 and 25 years.^[8] It can also occur with maxillary canines, typically scheduled to erupt around 11 to 12 years, and second premolars, anticipated between 11 and 13 years.^[1] These examples illustrate how impaction disrupts the sequential eruption of permanent teeth, which generally occurs from ages 6 to 13 for most, except third molars.^[9]

Epidemiology

Tooth impaction, particularly of third molars, affects a substantial portion of the global population. A systematic review and meta-analysis of 98 studies involving 183,828 subjects reported a pooled prevalence of impacted third molars of 36.9% [95% CI: 33.1–40.7%] per subject and 46.4% [95% CI: 36.7–56.1%] per tooth.^[10] Among impacted third molars, mandibular impactions are more common, comprising approximately 57-72% of cases compared to 26-43% for maxillary ones, with odds of mandibular impaction being 1.9 times higher than maxillary.^[11]^[12] Demographic factors significantly influence the occurrence of third molar impaction. It is more prevalent in females, with an odds ratio of 1.173 [95% CI: 1.021–1.347], potentially attributable to smaller jaw sizes relative to tooth dimensions.^[10] The condition peaks in late adolescence to early adulthood, typically between 17 and 25 years, aligning with the typical eruption period for third molars.^[10] Ethnic and geographic variations exist, with higher prevalence in Asian populations (43.1% [95% CI: 34.6–51.7%]) compared to Europeans (24.5% [95% CI: 16.1–32.9%]).^[10] Impaction is less common in other teeth, such as maxillary canines, with prevalence estimates around 0.92-2.2%.^[13] Globally, recognition of tooth impaction has increased in developing regions owing to enhanced diagnostic imaging and dental access, but epidemiological data from studies through 2023 show no substantial shifts in prevalence rates following the 2020 pandemic.^[10]^[14]

Etiology and Risk Factors

Primary Causes

Tooth impaction primarily arises from developmental and anatomical constraints that prevent the normal eruption of teeth into the oral cavity. One of the most common underlying causes is insufficient space within the dental arch, which has been linked to the evolutionary reduction in human jaw size relative to tooth dimensions over millennia. This mismatch, observed in modern populations compared to ancestral hominids, results in crowding that hinders the eruption of posterior teeth, particularly third molars.^[15]^[16] Obstruction by adjacent teeth further contributes to impaction, where an erupting tooth is physically blocked by a neighboring one, such as the second molar impeding the path of the third molar. This mechanical interference disrupts the sequential eruption process, leading to the permanent tooth remaining embedded in the jawbone.^[17]^[5] Anatomical factors also play a significant role, including dense overlying bone that resists tooth migration during development, excessive soft tissue coverage that envelops the crown without allowing breakthrough, and abnormal positioning of the tooth follicle, which can deviate from the expected eruption pathway. These structural barriers alter the biomechanical forces required for eruption, often resulting in partial or complete impaction.^[17]^[18]^[19] Genetic influences, though less common, can predispose individuals to multiple impactions through inherited syndromes; for instance, cleidocranial dysplasia, caused by mutations in the RUNX2 gene, leads to delayed eruption, supernumerary teeth, and widespread impactions due to defective bone and dental development. Other syndromes, such as Gardner syndrome, can also lead to multiple impactions due to abnormalities in tooth development and jaw structure.^[20]^[21]^[6] Developmental anomalies during childhood, such as the premature loss of primary teeth, can cause adjacent teeth to drift and close off available space, thereby blocking the eruption of underlying permanent successors and promoting impaction. This space loss alters the arch alignment and prevents the natural guidance of erupting teeth.^[22]^[23]

Predisposing Factors

Poor nutrition during childhood, particularly diets lacking in essential nutrients like vitamin D and consisting predominantly of soft foods, can impair jaw growth and increase the risk of tooth impaction. Soft diets reduce masticatory forces necessary for proper mandibular development, leading to smaller jaw sizes that contribute to dental crowding and subsequent impaction of permanent teeth.^[24] Vitamin D deficiency can affect bone mineralization, potentially contributing to developmental issues in the alveolar bone.^[25] Habits such as prolonged thumb-sucking and mouth breathing further predispose individuals to impaction by altering arch development. Thumb-sucking beyond early childhood applies uneven pressure on the palate and teeth, narrowing the maxilla and promoting anterior open bites or crowding that hinder eruption paths.^[26] Mouth breathing, often due to nasal obstruction, positions the tongue low in the mouth, restricting transverse maxillary growth and leading to narrower arches prone to ectopic eruptions and impactions.^[27] In dental history, premature loss of primary teeth without subsequent space maintenance significantly elevates impaction risk through space loss and arch discrepancies. Early extraction of deciduous molars allows adjacent teeth to drift, reducing the available space by 1 to 4 mm per side in the dental arch, depending on the specific tooth and duration without intervention, and causing permanent tooth impaction or ectopic positioning.^[28]^[29] The absence of space maintainers fails to preserve leeway space, exacerbating crowding and increasing the likelihood of impacted canines or molars.^[30] Socioeconomic factors, including limited access to orthodontic care, compound these risks in underserved populations. Lower socioeconomic status correlates with delayed preventive interventions, allowing modifiable factors like crowding to progress untreated and heighten impaction incidence.^[31] Disparities in oral health equity mean that children from low-income families often lack timely orthodontic monitoring, perpetuating environmental and habitual contributors to impaction.^[32]

Classification

By Tooth Type

Tooth impactions are categorized by the specific tooth affected, with distinct patterns of frequency, bilateral occurrence, and clinical implications arising from their anatomical positions and roles in occlusion. Third molars, also known as wisdom teeth, represent the vast majority of impactions, accounting for approximately 90-95% of all cases across various populations.^[33] Their high prevalence stems from limited space in the posterior jaw as the dentition matures, often resulting in bilateral impactions in up to 75% of affected individuals.^[34] Due to their distal location, impacted third molars frequently lead to inflammatory complications such as pericoronitis or cyst formation, necessitating prophylactic removal in many cases to prevent recurrent infections or damage to adjacent second molars.^[35] Maxillary canines are the second most commonly impacted teeth, with a prevalence of 1-2% in the general population, while mandibular canines are rarer at about 0.2%.^[36] These impactions often arise from discrepancies in arch length or abnormal eruption paths during mixed dentition, and they are more frequently unilateral than in third molars. Untreated maxillary canine impactions can cause significant aesthetic concerns due to their prominent role in smile esthetics, as well as functional issues like midline shifts or occlusal interferences, often requiring combined orthodontic-surgical intervention to guide eruption or extract if irretrievable.^[37] Premolar impactions are uncommon, occurring in roughly 0.5% of cases, with mandibular second premolars being the most affected among this group at about 0.08-0.3%.^[38] Incisor impactions are even rarer, typically below 0.1%, and are frequently associated with genetic syndromes such as cleidocranial dysplasia or Gardner syndrome, where multiple teeth including central incisors fail to erupt due to underlying skeletal or developmental anomalies.^[39] In contrast to posterior impactions, anterior teeth like canines and incisors predispose patients to orthodontic challenges and potential root resorption of neighboring teeth, whereas posterior types such as third molars and premolars heighten risks of localized infections or periodontal pathology from their proximity to soft tissues and bone.^[40]

By Position and Angulation

Tooth impaction is classified by position and angulation based on the orientation of the impacted tooth's long axis relative to the adjacent erupted tooth, typically assessed using panoramic radiographs or orthopantomograms to measure the angle formed between their longitudinal axes.^[41] This classification, notably Winter's system, aids in predicting surgical challenges and treatment planning, with angulation influencing the degree of operative difficulty.^[42] The primary angulation types include vertical, where the impacted tooth aligns nearly parallel to the adjacent tooth's long axis (angle of 10° to -10°), indicating a normal eruption path obstructed by space limitations or soft tissue.^[41] Mesioangular impaction features a forward tilt toward the anterior (11° to 79°), representing the most common pattern for mandibular third molars at approximately 36-45% of cases.^[41]^[7] Distoangular impaction involves a backward tilt away from the anterior (-11° to -79°), while horizontal impaction shows a near-perpendicular orientation (80° to 100°), often complicating access during extraction.^[41] Less frequent variants include buccolingual (or buccoversion/linguoversion) angulation, where the crown and roots appear superimposed on radiographs due to tilting toward the cheek or tongue, obscuring precise measurement.^[41] Inverted impaction, a rare orientation where the tooth is upside down (often exceeding 100° or under "other" categories in extended classifications), further deviates from normal alignment and is typically seen in complex cases.^[43]^[41] Clinically, horizontal and distoangular impactions elevate surgical complexity, often scoring higher on difficulty indices (e.g., 3-4 on scales like the Pernambuco or Sammartino), due to increased proximity to the inferior alveolar nerve and greater bone removal requirements.^[42] In contrast, mesioangular and vertical types generally pose moderate difficulty, facilitating less invasive approaches.^[42]

By Depth and Relationship to Adjacent Structures

Tooth impaction is classified by depth based on the vertical position of the impacted tooth relative to the occlusal plane of the adjacent erupted tooth and the horizontal relationship to the anterior border of the mandibular ramus or maxillary tuberosity. The Pell and Gregory classification, introduced in 1933, provides a foundational system for mandibular third molars, dividing impactions into three classes according to their anteroposterior relation to the ramus: Class 1, where the distal aspect of the second molar is positioned anterior to the anterior border of the ramus, allowing sufficient space for eruption; Class 2, where the second molar overlaps the ramus border, indicating partial obstruction; and Class 3, where the impacted tooth lies entirely or mostly posterior to the ramus border within the ramus itself, representing the deepest and most challenging impactions.^[44] This system emphasizes how increasing class depth correlates with greater surgical complexity due to limited access and higher risk of bone removal.^[41] Within the Pell and Gregory framework, vertical depth is further subdivided into positions A, B, and C relative to the occlusal plane of the second molar: Position A, where the highest point of the impacted tooth aligns with or is above the occlusal plane, facilitating easier exposure; Position B, where it lies between the occlusal plane and the cervical line of the second molar, requiring moderate bone reduction; and Position C, where the entire crown is below the cervical line, often necessitating extensive surgical intervention.^[44] For maxillary third molars, analogous depth assessments consider proximity to the maxillary tuberosity, with deeper positions increasing the risk of tuberosity fracture during extraction.^[45] These depth metrics, commonly evaluated via panoramic radiography, help predict operative difficulty, as Position C impactions are associated with prolonged procedure times and elevated complication rates.^[46] The relationship of the impacted tooth to adjacent structures further refines classification and risk stratification, particularly for mandibular impactions near the inferior alveolar nerve (IAN) or adjacent tooth roots, and maxillary cases involving the maxillary sinus. In mandibular third molars, Class 3 or Position C impactions heighten the likelihood of close IAN proximity, where the mandibular canal may overlap the roots, raising the incidence of neurosensory disturbances post-extraction to up to 5-10% in high-risk cases; radiographic signs such as darkening of the root apex or interruption of the canal white line on panoramic views indicate such relationships.^[47]^[48] For maxillary third molars, deeper impactions (equivalent to Position C) often position roots adjacent to or protruding into the maxillary sinus floor, with studies showing over 40% of such teeth having root apices within 1-2 mm of the sinus membrane, predisposing to oroantral fistulas or sinusitis during removal.^[45]^[49] Proximity to adjacent roots, common in mesially positioned mandibular impactions, can lead to external root resorption, observed in approximately 20-30% of cases with overlapping depths.^[50] Assessment of depth and structural relationships relies primarily on radiographic imaging to guide treatment planning and minimize risks. Panoramic radiographs provide initial two-dimensional evaluation of depth classes and positions, while cone-beam computed tomography (CBCT) offers three-dimensional precision for delineating IAN or sinus proximity, especially in Class 3/Position C cases where surgical access is compromised by overlying bone or vital structures.^[41]^[51] This imaging informs flap design, osteotomy extent, and potential need for nerve monitoring, with deeper impactions generally requiring more invasive approaches to avoid iatrogenic damage.^[46]

Clinical Presentation and Diagnosis

Symptoms

Tooth impaction often presents with a range of symptoms stemming from the tooth's failure to erupt properly, leading to pressure on surrounding tissues or partial exposure that traps debris. Common signs include pain or discomfort in the jaw, particularly during attempts at eruption, as the impacted tooth exerts force on adjacent structures. Swelling and tenderness in the gums around the affected area are frequent, often accompanied by redness or bleeding upon brushing. Food impaction in the partially erupted crown can occur, fostering bacterial growth and resulting in bad breath or an unpleasant taste in the mouth.^[8]^[3]^[52] In severe cases, symptoms may escalate to trismus, or difficulty opening the mouth, due to inflammation or muscle spasm in the jaw. Prolonged jaw aches or headaches can arise from referred pain, while swollen lymph nodes in the neck may signal underlying infection. Notably, many impactions, especially fully embedded teeth, remain asymptomatic in early stages, with no noticeable discomfort until secondary issues develop.^[3]^[52]^[3] Symptom variations depend on the impacted tooth type. For third molars, pericoronal inflammation—such as pericoronitis—commonly causes localized pain, swelling, and infection around the partially erupted crown. Impacted canines, by contrast, may lead to discomfort in the anterior jaw, gum tenderness, and misalignment of nearby teeth, potentially resulting in visible gaps or shifts in the dental midline.^[53]^[52]^[54] Onset is typically gradual, with mild discomfort emerging during adolescence or early adulthood as the tooth attempts to erupt, and symptoms often worsening with age if untreated due to progressive pressure or complications like cyst formation.^[8]^[3]

Diagnostic Techniques

Diagnosis of tooth impaction typically begins with a thorough clinical examination to identify physical signs suggestive of an unerupted tooth. Visual inspection may reveal asymmetry in dental eruption patterns or the absence of an expected tooth bulge in the alveolar ridge by the typical eruption age, such as around 11-12 years for permanent canines. Palpation of the buccal and lingual mucosa using the index fingers of both hands allows assessment of the tooth's position; a palpable bulge is normally detectable 1-1.5 years prior to eruption, and its absence after age 10 often indicates potential impaction or ectopic positioning.^[55] Additionally, evaluation of adjacent teeth for mobility or displacement can signal pressure from the impacted tooth, aiding in early detection during routine exams.^[56] Radiographic imaging is essential for confirming clinical suspicions and characterizing the impaction's location, orientation, and relationship to surrounding structures. Panoramic radiographs serve as the standard initial modality, offering a comprehensive two-dimensional overview of the dentition, jaws, and sinuses to visualize unerupted teeth and basic angulation.^[57] For more precise evaluation, particularly in complex cases involving proximity to vital structures like the inferior alveolar nerve or maxillary sinus, cone-beam computed tomography (CBCT) has become the preferred method since the early 2010s, providing three-dimensional reconstructions with lower radiation doses than traditional CT while accurately assessing depth, position, and potential root resorption of adjacent teeth.^[58] These images also facilitate the application of classification systems, such as those based on angulation or depth, to guide treatment planning. Advanced imaging techniques play a supplementary role in select scenarios. Ultrasound may be employed for non-invasive evaluation of soft tissues overlying potential impaction sites, helping to differentiate soft tissue barriers from bony obstructions without radiation exposure.^[59] Magnetic resonance imaging (MRI) is rarely utilized due to cost and availability but offers radiation-free, high-contrast three-dimensional visualization of impacted teeth and their volumetric morphology, particularly beneficial in pediatric cases requiring repeated imaging.^[60] Differential diagnosis is crucial to rule out conditions mimicking impaction, integrating clinical and radiographic findings. Ankylosis, characterized by direct fusion of the tooth to alveolar bone without a periodontal ligament, can be distinguished by the lack of mobility on percussion and radiographic evidence of absent radiolucency around the root, often confirmed via CBCT.^[56] Similarly, odontogenic tumors or cysts associated with unerupted teeth may present as radiolucent lesions encompassing the crown, necessitating biopsy or advanced imaging for differentiation from simple impaction.^[61]

Complications

Inflammatory and Infectious Issues

Tooth impaction, particularly of third molars, can lead to inflammatory and infectious complications due to the entrapment of bacteria and food debris in the pericoronal tissues. Pericoronitis, the most common such issue, involves inflammation of the soft tissue flap (operculum) overlying a partially erupted tooth, primarily mandibular third molars, resulting from bacterial proliferation in this inaccessible area.^[62]^[63] The condition arises when normal oral flora, including species like Streptococcus milleri, Actinomyces, and Prevotella, accumulate under the operculum, exacerbated by mechanical trauma from opposing teeth during mastication.^[62]^[63] Symptoms of pericoronitis typically include localized pain, swelling, purulent discharge, fever, halitosis, trismus (limited mouth opening), and dysphagia, which can significantly impair daily function.^[62]^[63] It affects approximately 6% to 9% of emergency dental patients annually, with over 95% of cases linked to mandibular third molars, and is most prevalent in individuals aged 20 to 29 during the typical eruption period.^[63] Poor oral hygiene is a key risk factor, as it promotes plaque buildup and bacterial overgrowth in the pericoronal pocket.^[62] Beyond pericoronitis, untreated impactions can progress to more severe infections such as localized abscesses or spreading cellulitis, where inflammation extends into adjacent fascial spaces of the neck, potentially leading to Ludwig's angina or airway compromise if not addressed promptly.^[62]^[63] These complications are more frequent in young adults with impacted third molars due to the anatomical challenges of eruption and hygiene maintenance in this demographic.^[62] Initial management often involves irrigation, debridement, incision and drainage of pus, and systemic antibiotics such as amoxicillin (500 mg every 8 hours for 5 days), with definitive resolution typically achieved following extraction of the impinged tooth.^[62]

Structural and Developmental Complications

Dentigerous cysts represent a significant structural complication arising from tooth impaction, characterized as fluid-filled sacs that form around the crown of an unerupted tooth due to the accumulation of fluid between the reduced enamel epithelium and the tooth crown. These cysts are the most common type of developmental odontogenic cysts, accounting for approximately 15-25% of all odontogenic cysts in the jaws and frequently associated with impacted third molars and maxillary canines. The prevalence of dentigerous cysts specifically linked to impacted third molars is relatively low, with pathologic lesions occurring in about 2.5% of cases, of which dentigerous cysts comprise around 24%. When large, these cysts can lead to expansion and thinning of the cortical bone, potentially resulting in jaw swelling or pathological fracture if untreated.^[64]^[65]^[66]^[67] Root resorption of adjacent teeth is another critical structural issue induced by the mechanical pressure exerted by an impacted tooth against neighboring root structures, leading to gradual breakdown of cementum and dentin. This complication is rare but particularly serious when affecting anterior teeth such as incisors, where it can compromise tooth stability and necessitate extraction. Studies using cone-beam computed tomography (CBCT) report varying incidences, with root resorption occurring in 18.5% to 60% of cases involving impacted maxillary canines, most commonly affecting the lateral incisor at the apical or middle third of the root. The severity ranges from slight to severe, influenced by factors like the angulation of the impacted tooth, and can exacerbate structural integrity loss over time.^[68]^[69] Tooth impaction also contributes to broader developmental complications, including delayed eruption of adjacent permanent teeth due to spatial interference and obstruction of the eruption pathway. This delay can persist beyond the expected eruption timeline, often by 12 months or more, affecting overall dental arch development. Furthermore, impactions frequently worsen malocclusion by displacing neighboring teeth or altering occlusal relationships, leading to crowding, spacing anomalies, or misalignment that impacts masticatory function and aesthetics if not addressed early.^[70]^[71]^[72] Detection of these structural and developmental complications relies heavily on advanced imaging, with CBCT providing superior three-dimensional visualization compared to traditional radiographs for identifying cyst extent, root resorption depth, and positional relationships to adjacent structures. Untreated impactions can allow these issues to progress long-term, potentially amplifying bone alterations and eruption disturbances.^[73]^[74]

Long-term Health Risks

Untreated tooth impaction can contribute to the development of periodontal disease in adjacent teeth through increased bacterial accumulation and plaque retention, leading to deeper periodontal pockets and subsequent alveolar bone loss. Studies indicate that approximately 44% of impacted teeth are associated with periodontal bone loss, while 33% result in root resorption of neighboring teeth.^[75] The presence of impacted third molars, in particular, disrupts the periodontal ligament and periodontium of adjacent second molars, elevating the risk of chronic gingival inflammation and attachment loss.^[76] Impacted canines often exert prolonged pressure on surrounding dentition, inducing orthodontic shifts such as crowding or spacing irregularities in the anterior teeth. This misalignment arises as adjacent teeth migrate to compensate for the obstruction, potentially complicating future orthodontic interventions and altering occlusal harmony over time.^[77] Rare but significant long-term risks include the association between impacted teeth and ameloblastoma, a benign odontogenic tumor, with unicystic ameloblastomas showing the highest frequency of linkage to unerupted teeth, particularly mandibular third molars.^[78] Impacted teeth may also heighten the susceptibility to jaw fractures during trauma, as unerupted third molars weaken mandibular structural integrity at fracture-prone sites like the angle.^[79] Research has suggested that chronic inflammation from untreated dental infections, which can stem from impactions and resultant periodontal issues, may contribute to cardiovascular disease, with individuals experiencing such infections facing up to 2.7 times the likelihood of coronary artery disease compared to those with healthy oral conditions.^[80]^[81] Rarely, chronic irritation from impacted teeth may contribute to neoplastic changes, including odontogenic keratocysts or, exceptionally, malignant transformations like squamous cell carcinoma.^[82] Even asymptomatic impactions can progress silently, fostering gradual pathological changes without overt symptoms, underscoring the importance of routine radiographic monitoring to detect subclinical advancements.^[83]

Management and Treatment

Conservative Management

Conservative management of tooth impaction focuses on non-invasive monitoring and minor interventions to preserve the tooth when surgical extraction is not immediately warranted, particularly for asymptomatic cases or those with low complication risk. For impacted third molars, watchful waiting involves active clinical and radiographic surveillance to detect early signs of pathology without proactive removal. According to the American Association of Oral and Maxillofacial Surgeons (AAOMS), retention with regular monitoring is appropriate for disease-free, asymptomatic third molars, as many patients can remain unaffected lifelong if no issues arise.^[84] This approach emphasizes evaluation by a specialist before the mid-20s, when surgical risks increase with age, allowing informed decisions on observation versus intervention.^[84] Orthodontic strategies play a key role in conservative management, especially for impacted maxillary canines, where the goal is to guide eruption without full extraction. Treatment often includes creating space in the dental arch using nickel-titanium open coil springs between adjacent teeth, such as the lateral incisor and first premolar, to facilitate alignment prior to any exposure.^[77] Following space creation, surgical exposure may be performed minimally, with an orthodontic bracket bonded to the exposed tooth surface and a gold chain or elastic thread attached for gentle traction into the arch using light forces on a stainless steel wire.^[77] This closed eruption technique minimizes bone removal and supports optimal periodontal health, particularly for canines positioned in the middle third of the alveolus.^[77] Extraction of the primary canine can promote spontaneous eruption in up to 80% of palatally impacted cases in patients aged 10-13, provided the canine cusp does not cross the lateral incisor's long axis.^[77] Pain management and preventive hygiene are essential components to address symptomatic episodes, such as pericoronitis associated with partially erupted impacted teeth. Nonsteroidal anti-inflammatory drugs (NSAIDs), like ibuprofen, serve as the primary analgesic to reduce inflammation and discomfort, often supplemented by local anesthetic injections or topical agents if needed.^[62] Hygiene instructions include irrigating the pericoronal pocket with chlorhexidine or saline, mechanical debridement using periodontal instruments, and maintaining rigorous oral care through brushing, flossing, and antiseptic mouth rinses to lower bacterial accumulation and prevent recurrent infection.^[62] Indications for conservative management are limited to low-risk patients without active disease, such as asymptomatic impactions in non-growing adults where retention poses minimal threat of complications like caries or cyst formation.^[84] This strategy is unsuitable for growing adolescents with high-risk features, where proactive orthodontic guidance is preferred to avoid long-term alignment issues. Monitoring during conservative care should include periodic radiographic assessments to watch for potential complications, such as inflammatory changes.^[84]

Surgical Interventions

Surgical interventions for tooth impaction primarily involve extraction techniques tailored to the depth and position of the impacted tooth, with procedures selected based on radiographic classification to minimize trauma to surrounding structures.^[6] For soft tissue impactions, where the tooth is partially erupted but covered only by gingival tissue without significant bone involvement, simple extraction is often sufficient. This procedure employs dental elevators to loosen the tooth and forceps to grasp and remove it, typically performed under local anesthesia in an outpatient setting.^[85]^[86] In cases of partial or full bony impactions, surgical extraction is required, involving more invasive steps to access the tooth. A mucoperiosteal flap is raised to expose the overlying bone, which is then carefully removed using a surgical handpiece or bur to uncover the crown and roots. The tooth may be sectioned into smaller segments with a bur or saw to facilitate removal without excessive force, reducing the risk of fracture to adjacent teeth or jaws. Local anesthesia, such as lidocaine, is standard for pain control, while conscious sedation options like nitrous oxide or intravenous agents are used for patients with high anxiety to enhance comfort during the procedure.^[87]^[6]^[88] Advanced techniques address specific risks, such as proximity to the inferior alveolar nerve in mandibular third molar impactions. Coronectomy involves deliberate removal of only the crown of the impacted tooth, leaving the roots in place to avoid direct manipulation near the nerve, particularly in high-risk cases where radiographic evidence shows close root-nerve contact; this approach to prevent neurosensory deficits.^[89]^[90] Piezosurgery utilizes ultrasonic vibrations from a piezoelectric device to selectively cut bone with high precision, sparing soft tissues like nerves and vessels due to its selective action on mineralized structures, thereby improving safety and reducing postoperative swelling compared to traditional rotary instruments.^[91] Post-2020 developments have introduced minimally invasive endoscopy-assisted methods for impacted tooth extraction, employing small incisions and intraoral endoscopes for visualization, which allow precise bone removal and tooth sectioning while reducing tissue dissection and accelerating recovery times by minimizing postoperative pain and edema. Recent advances as of 2025 include the use of 3D imaging and virtual surgical planning to enhance precision in procedure planning, as well as platelet-rich fibrin (PRF) application to promote wound healing and reduce complications post-extraction.^[92]^[93]^[94]^[95]

Prognosis and Prevention

Treatment Outcomes

Surgical extraction of impacted teeth, particularly third molars, achieves high success rates, with resolution in approximately 90-95% of cases and low recurrence due to complete removal of the tooth.^[96] Complications occur in 5-10% of procedures, including dry socket (3.2%), inferior alveolar nerve injury (1.7%), and wound infection (1.4%), though most resolve within 6 months.^[97] Recovery following extraction typically spans 1-2 weeks for simple cases, with initial rest required for 3-5 days and peak pain or swelling around days 3-4; surgical interventions for deeply impacted teeth may extend this period, often necessitating a soft diet for the first week.^[98] Younger patients experience faster healing and fewer complications compared to older individuals, where bone density and tissue elasticity contribute to prolonged recovery.^[99] Long-term outcomes include enhanced oral health through reduced risks of pericoronitis, cyst formation, and adjacent tooth damage, with most patients reporting sustained improvement in function and aesthetics.^[98] For anterior impactions like canines, orthodontic follow-up is crucial, yielding alignment success rates of 90-96% and stable periodontal health when combined with surgical exposure.^[100] Meta-analyses up to 2024 indicate low-certainty evidence that prophylactic removal may benefit high-risk or symptomatic cases by preventing pathology, though insufficient data exists to definitively favor removal over retention for asymptomatic impactions, with risks including nerve damage.^[101]

Preventive Measures

Early orthodontic monitoring plays a crucial role in reducing the incidence of tooth impaction, particularly for maxillary canines, which are among the most commonly affected teeth. The American Association of Orthodontists recommends that children undergo an evaluation by an orthodontist around age 7 to identify potential eruption issues, as this timing allows for interceptive measures before impaction occurs. For children aged 7 to 9 at higher risk due to familial patterns or early crowding, assessments can guide interventions like serial extractions or appliances to create space for proper eruption.^[102] In cases of premature primary tooth loss, space maintainers—such as band-and-loop appliances—are fitted to hold open the gap, preventing adjacent teeth from shifting and blocking permanent tooth eruption, thereby lowering impaction risk.^[103] Lifestyle factors supporting optimal jaw development can also mitigate impaction risks. A balanced diet rich in calcium, phosphorus, and vitamin D promotes healthy bone growth and tooth positioning, with research indicating that childhood vitamin D deficiency correlates with wider tooth roots and higher rates of third molar impaction.^[104] Incorporating firm, chewable foods like raw vegetables and fruits stimulates jaw muscle development and broader arch formation, reducing crowding that predisposes teeth to impaction.^[105] Additionally, discouraging habits such as prolonged pacifier use beyond age 3 prevents narrowing of the dental arches and anterior open bites, which can contribute to ectopic eruption paths.^[106] Routine dental care facilitates proactive prevention through consistent monitoring. Regular check-ups every 6 to 12 months, especially during adolescence, enable clinicians to track tooth development, with panoramic radiographs recommended as clinically indicated for high-risk individuals to visualize third molar positioning and intervene before full impaction develops.^[107] In families with a history of impaction, prophylactic orthodontics—such as early phase I treatment with expanders or headgear—can address genetic or developmental predispositions by optimizing space and alignment.^[108] Public health efforts emphasize education and emerging tools to curb impaction prevalence. Awareness campaigns highlight third molar risks, as studies show low public knowledge of associated complications like infection, prompting earlier dental visits among informed populations.^[109] Genetic screening for syndromes linked to multiple impactions, such as cleidocranial dysplasia involving RUNX2 mutations, enables early identification in at-risk families, allowing tailored preventive strategies before widespread eruption failures occur.^[110] As of 2025, advances in machine learning models for predicting impaction risk from radiographs and systematic reviews on genetic factors (e.g., identifying specific genes associated with impaction) offer promising tools for enhanced early detection and personalized prevention.^[111]^[38]

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Jun 23, 2022 · The purpose of this study is to explore the associations of race and ethnicity on age of third molar extractions and complications.
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Prevalence, etiology, clinical features and management associated ...
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Prevalence and Pattern of Tooth Impaction: A Radiographic...
The aim of this retrospective study was to determine the prevalence and patterns of impacted third molars in a Trinidadian population.
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[PDF] On The Evolution of Human Jaws and Teeth: A Review | SleepClinic
According to Lieberman (59), this reduction in the size of maxilla and mandible also lead to the crowding of the teeth and tooth impactions, which could have ...<|separator|>
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Impacted wisdom teeth are defined as third molars that fail to erupt into their normal position due to obstruction by adjacent teeth, dense bone, ...
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Influence of odontogenic lesions on root development in impacted ...
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Impediments and Discretion During Management Perplexities in ...
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Early loss of primary molar may result in lack of space, development of ... anomalies, and, especially, impaction of the erupting permanent tooth and ...
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[PDF] Canine Impaction- A Review of the Prevalence, Etiology, Diagnosis ...
Introduction: An impacted tooth is defined as a tooth that fails to erupt after the normal development pattern is complete. Maxillary canines are the most ...
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Food texture and vitamin D influence mouse mandible form and ...
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Impact of Pacifiers & Thumb Sucking on Children's Teeth
While thumb sucking and pacifier use is a natural reflex for infants, prolonged sucking can exert pressure on their teeth and jaws, negatively impacting their ...
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The impact of mouth breathing on dentofacial development
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[PDF] Prevalence of Impacted Teeth and Related Pathologies
Dec 29, 2023 · The third molars were the most prevalent impacted teeth, with approximately 92% of all impacted teeth, followed by canines and supernumerary ...
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Prevalence and pattern of third molars impaction in a large Yemeni ...
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[PDF] Clinical Paper - AAOMS
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Comparing the prevalence of impacted teeth through radiographic ...
A tooth is considered impacted when it fails to erupt into its normal anatomical position beyond its expected chronological time (Archer, 1975). Several ...
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Impacted canines: Etiology, diagnosis, and orthodontic management
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The genetic basis of tooth impaction: a systematic review
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Idiopathic multiple impacted unerupted teeth: Case report and ...
Multiple impacted teeth are usually present in syndromes. The differential diagnoses in case of syndromes are Cleidocranial dysostosis, Gardners syndrome, ...
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Complications Following Surgery of Impacted Teeth and Their ...
Nerve injuries are mostly associated with removal of mandibular impacted teeth (third molars and premolars). The inferior alveolar nerve (IAN), lingual and ...<|control11|><|separator|>
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Radiographic Position of Impacted Mandibular Third Molars ... - NIH
Figure 4. Angulation of impaction according to the Winter's classification. (a) Vertical impaction: 10° to −10°. (b) Mesioangular impaction: 11° to 79°.
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Review of Difficulty Indices for Removal of Impacted Third Molars ...
Oct 3, 2020 · Third molars with an angle between 61 º and 90º were considered to be vertical. Third molars with an angle > 90º were considered distoangular.
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Winter's Classification The classification is based on the inclination of the impacted wisdom tooth (3rd molar) to the long axis of the 2nd molar.
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[PDF] Pell and Gregory Classification 1933
Class III impactions are those in which all or most of the third molar is in the ramus of the mandible. Position A. The highest portion of the.
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Relationship of maxillary third molar root to the maxillary sinus wall
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The Pattern of Mandibular Third Molar Impaction and Assessment of ...
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Assessment of the proximity between the mandibular third molar and ...
The inferior alveolar nerve (IAN) may be injured during extraction of the mandibular third molar, which often results in severe complications for patients [1].
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Classification of impacted mandibular third molars using cone beam ...
Anatomic relationship between impacted third mandibular molar and the mandibular canal as the risk factor of inferior alveolar nerve injury. Br J Oral ...
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Evaluation of the Maxillary Third Molars and Maxillary Sinus Using ...
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Impacted wisdom teeth (third molars) occur because of a lack of space, obstruction, or abnormal position. They can cause pain, swelling, and infection, and may ...
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A Review of Impacted Permanent Maxillary Cuspids — Diagnosis ...
Diagnosis of impacted cuspid teeth at age 8-10 years can significantly reduce serious ramifications, including surgical exposure and orthodontic alignment.
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A differential diagnosis for an impacted tooth is not possible without clinical assessment. However, an ankylosed tooth or a tooth with failure of its ...
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The diagnostic performance of impacted third molars in the mandible
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The diagnostic efficacy of cone beam CT for impacted teeth and ...
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Ultrasound is a non-invasive, cross-sectional imaging technique emerging in dentistry. It is an adjunct tool for diagnosing pathologies in the oral cavity.
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Three-dimensional localization of impacted teeth using magnetic ...
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Prevalence and characteristics of and risk factors for impacted teeth ...
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Dentigerous cyst with an impacted third molar obliterating complete ...
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A dentigerous cyst associated with bilaterally impacted mandibular ...
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The incidence of cysts and tumors associated with impacted third ...
In our study, the incidence of dentigerous cyst associated with impacted third molars was 24.1% ameloblastoma 15.7%, OKC - 14.3%, radicular cyst 5.7%, two ...
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Appearance can be deceptive: Dentigerous cyst crossing the midline
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Root Resorptions on Adjacent Teeth Associated with Impacted ...
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Treatment and genetic analysis of multiple supernumerary and ...
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The Use of Cone Beam Computed Tomography for the Evaluation of ...
CBCT can provide useful 3D information to aid in the surgical uncovering of the impacted tooth. External Root Resorption. In external root resorption, ...The Use Of Cone Beam... · Dentigerous Cyst · Mucous Retention Cyst...<|control11|><|separator|>
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A Retrospective Study: Do All Impacted Teeth Cause Pathology?
The pathology that was most commonly caused by impacted teeth was periodontal bone loss (44.4%), and respectively others were root resorptions (33.3%), cysts or ...
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The presence of impacted third molars adversely affects the periodontium of adjacent second molars as reflected in disruption of the periodontal ligament, root ...
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Orthodontic traction of impacted canines: Concepts and clinical ...
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The Medical Minute: Tooth trouble linked to heart trouble
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Patterns of Mandibular Third Molar Impactions and Its Association ...
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[PDF] Management of Third Molar Teeth - AAOMS
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An overview on the art of piezosurgery in the maxillofacial practice
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Endoscope-assisted Surgical Removal of an Ectopic Wisdom Tooth ...
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Removal of remotely displaced maxillary third molar via endoscopic ...
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Prevalence of and risk factors for postoperative complications after ...
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Removal of Impacted Wisdom Teeth - BAOMS
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Evaluating the success rates and effectiveness of surgical and ...
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Prophylactic third molar removal: are oral surgeons and ...
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[PDF] Surgical Extraction of Impacted Teeth – Dental Clinical Policy
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Early Detection and Interceptive Orthodontic Treatment of Impacted ...
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Childhood diet may contribute to impacted wisdom teeth, USask ...
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Relationship between Nutrition and Development of the Jaws in ...
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Pacifier Use and Its Influence on Pediatric Malocclusion - NIH
Conclusion: There is strong evidence linking pacifier use to negative dental developmental outcomes, particularly when use is prolonged or frequent. Early ...
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Orthodontic management of ectopic and impacted teeth
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Awareness of patients with impacted teeth about ... - PubMed Central
This study showed that although patients are aware of their existing impacted teeth, their level of knowledge about the risks it may pose is low.
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The genetic basis of tooth impaction: a systematic review - PMC
Sep 22, 2025 · Based on the “genetic theory” mutations in key developmental genes cause tooth impaction alongside with other genetic features like dental ...