In young adults ,surgical intervention of the removal of the third molar is very common in the field of dentistry. According to the literature ,tooth impaction is a common phenomenon .But there is significant variation in the prevalence and distribution of impacted teeth in various region of the jaw. Major factors that affect the prevalence encompass selected age group and timing of dental eruption as well.Many investigators questioned the removal of third molar though being very common if the patient is free from symptoms or pathologies related to it. According to a research by Dr Shetty, 300 college students varying in age from 17-24 years were randomly selected for the study .The number of males were 1583 and of females were 1417.oral examination was conducted for varying age group using calibrated dental examiners. Whether the third molar was present or absent in the sample together with their eruption status was recorded at a specific time . They were further categorized as Erupted(E):Completely erupted tooth crown at occlusal plane level .Non erupted(NE):Tooth was invisible in oral cavity or only a single cusp of the tooth crown was visible.
The result of the above examination was further divided into sections consisting of different people with similar age .The study by Dr Devicharan Shetty shown that maximum sample with 0 molars belonged to age 18 years with 1 molar erupted belonged to age group of 17 years . sample in 22 years of age group had maximum 2 molars erupted .
Out of twenty follicular tissues obtained from asymptomatic extraction,seven of them showed definite changes such as proliferation, squamous metaplasia and to a certain extent mucous metaplasia was also observed in the lining of otherwise flat cells. If there is any disease that is associated with the third molar teeth then it is considered as an indication for its removal on which both dentist and dental specialist are in agreement with. Prophylactic removal sill remains controversial. However the question of removing asymptomatic third molar is still a topic of debate even though it has been shown that number of serious sequelae of retention of these teeth is small by several cross sectional studies.
Follicular swelling of impacted third molars is another serious concern in the literature because if such cystic variations develop ,the management of the pathological lesion becomes difficult.The prevalence of advancing size of pericoronal space more than 4 mm in impacted third molar is approximately 1%.