A survey of 3874 routine full mouth radiographs. A study of impacted teeth; J Oral Maxillofac Surg
- SF Dachi, FV Howell
- N % Females
Aim: The aim is to investigate the frequency of third molar agenesis, impactions, their angular positions and pathologic changes associated with it. Objective: Third molar agenesis is due to genetic changes as well as modification of skull sizes in the course of evolution. This is also the reason for third molar impaction due to lack of space for eruption into the oral cavity. Sometime it lies horizontally over the preceding second molar tooth causing infection in it as well. The angular positions of third molar can be mesioangular, distoangular, vertical or horizontal. Also long term retained impacted third molars can be potentially pathologic. This study will determine the frequency of agenesis and impactions. Materials and methods: The sample consists of 122 orthopantomograms of patients in which the pattern of third molar eruption and position were evaluated. Results : Agenesis of third molar is less (8%). Impaction is most commonly seen in mandible. Mesioangular is the commonest pattern of impaction.