Pattern of mandibular third molar impaction in the Indian population: A retrospective clinico-radiographic survey

Professor, Department of Oral and Maxillofacial Surgery, Dr. D. Y. Patil Dental College and Hospital, Padmashree Dr. D. Y. Patil University, Nerul, Navi Mumbai, India.
Oral surgery, oral medicine, oral pathology and oral radiology 07/2012; 116(3). DOI: 10.1016/j.oooo.2011.12.019
Source: PubMed


The objective of this study was to study incidence of type of impaction of mandibular third molars in the Indian population.

Study design:
Data of 1200 patients examined during a 5-year period were reviewed, which included status of mandibular third molar for inclination, emergence in oral cavity, and prevalence of caries. Radiographically, angulation of tooth, level of occlusal surface of third molar with respect to second molar, relationship between ascending ramus of mandible and distal surface of third molar, and proximity to inferior alveolar nerve were studied.

Of 1200 patient data reviewed, 620 (51.77%) were of men and 580 (48.3%) were women in the age group of 20 to 40 years (26.3 years). Mesioangular impaction was most prevalent followed by distoangular. A strong statistical significance was found between gender and ramus relationship. Fifty percent of cases showed proximity to the inferior alveolar nerve, which was more frequent in males (58.3%).

Our study highlights mesioangular impaction as the most frequently encountered angulation in impacted teeth.

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    • "commonly impacted teeth were mandibular 3rd molars (TableĀ 4). These findings are in concurrence with the findings from other studies [6,17,21,31]. The reasons for this occurrence have been explained by others [32,33]. "
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    ABSTRACT: Impacted teeth predispose to periodontal disease and dental caries of adjacent second teeth resulting in pain, discomfort and loss of function. This study analyzed the pattern of occurrence of impacted teeth, associated symptoms, treatment and complications of treatment in patients who presented at the Muhimbili National Hospital, Tanzania. This was a crossectional descriptive study which utilized notes and x rays of patients who were treated for impacted teeth at the Oral and Maxillofacial firm in Muhimbili National Hospital over five years, from January 2005 to August 2010. These records were retrieved and examined for the major complaint of the patient at presentation to hospital, demography, impacted tooth, type of impaction (for third molars), treatment offered and complications after treatment. Similar information was collected from all patients with impacted teeth attended in the same centre from 1st September 2010 to 31st August 2011. A total of 896 patients (496 males and 400 females) treated for complaints related to impacted teeth were recorded. The male to female ratio was 1.2:1, age range of 16 to 85 years and a mean age of 28.9 years (SD = 9.5).Slightly more than 84% of the patients presented with mandibular third molar impactions. Most (44.7%) of these patients had an impacted lower right third molar followed by those presenting with a lower left third molar impaction (39.7%). In 1.3% of the patients all the four third molars were impacted. Sixty nine (7.7%) patients had impacted upper 3rd molars while 2% had impacted upper canines. Of the mandibular 3rd molar impactions 738 (76%) were mesio-angular type, 87 (8.9%) horizontal type and 69 (7.1%) disto-angular.Patients presented with a variety of complaints. About 85% of the patients presented to hospital due to varying degrees of pain. In 4.9% the detection of the impacted tooth/teeth was coincidental after presenting to hospital for other reasons not related to the impaction.Majority of the patients with impacted mandibular third molars had carious lesions on the impacted teeth, neighbouring tooth or both. Four hundred and five (45.2%) patients had a carious lesion on one of the impacted teeth while 201(22.4%) patients had a carious lesion on the adjacent second molar. In 122 (13.6%) patients both the impacted third molar and the adjacent second molar were carious. In twelve patients who presented with a main complaint of fracture of the angle of the mandible there was an associated impacted 3rd molar. Eight hundred and fifteen (91%) patients with impacted teeth were treated by surgical removal. Among these only 15 (1.8%) had complications that ranged from excessive swellings, trismus and severe pain post operatively. One patient was reported to have fracture of the angle of the mandible sustained during surgical removal of an impacted 48. The majority of patients with impacted teeth were young with an almost equal sex distribution. The most commonly impacted teeth were mandibular third molars followed by the maxillary third molars. Patients with impacted teeth reported for health care predominantly because of pain due to dental caries or infection.There is a need of creating appropriate programmes that would further raise peoples' awareness to regular dental checkups so that appropriate measures are taken before complications arise.
    BMC Oral Health 08/2013; 13(1):37. DOI:10.1186/1472-6831-13-37 · 1.13 Impact Factor
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    ABSTRACT: Bilateral inverted third molar impaction is an extremely rare condition. We reported the case of a 50-year-old female patient with bilateral inverted and impacted maxillary third molars. Both were asymptomatic and pathology free clinically and radiographically. Surgical extraction of these inverted third molars with inaccessible positions requires an aggressive bone removal on the tuberosity bilaterally. Moreover, it contains a high risk of displacement of the inverted third molar into the maxillary sinus. Conservative management was the choice, with the patient's agreement, and the inverted third molars were left in situ. Key words:Bilateral inverted, maxillary third molar, upper impacted tooth.
    Journal of Clinical and Experimental Dentistry 07/2015; 7(3):e441-3. DOI:10.4317/jced.52389