BIO Lecture Notes - Lecture 1: Prothrombin Time, Ecchymosis, Gingivectomy

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A tooth is said to be impacted only if the root formation is complete and yet it has not erupted fully upto the final position. Based on position of long axis of third molar in relation to long axis of second molar (winter"s classification) Classification of impacted mandibular third molars is based on (pell and. Gregory classification: relation of tooth to ramus of the mandible and second molar. Sufficient space to accommodate the mesiodistal diameter of crown. The space between distal surface of second molar and ramus is less than mesiodistal diameter of the crown of the third molar. The third molar is located within ramus: based on relative depth of the third molar: The highest portion of tooth at the level of occlusal line or above it. The highest portion of tooth is below occlusal line but above the cervical line of second molar. The highest portion of the tooth is below the cervical line of the second molar.

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