Because of the difficulty in extraction of impacted 3rd, It was suggested that it is very important to make a classification for the impacted 3rd molar. 
Table of Contents
Introduction
Because of the difficulty in extraction of impacted 3rd, It was suggested that it is very important to make a classification for the impacted 3rd molar.
Usage of Classifications
- Classifications Helps in assessing the best method to go for surgical extraction
- Helps in determining the actual position of impacted 3rd molar
- Communication language / Facilitates communication between Surgeons.
Name of Classifications
- Pell & Gregory Classification
- Winter Classification
- Asanami & Kasazaki Classification
Pell & Gregory Classification
It is catecorized by 2 Relations:-
1- Relation of tooth to the ramus of the mandible and the second molar
Class I:
When there is sufficient space between the anterior part of ramus and posterior/distal part of the second molar and the space accommodate with mesio-distal diameter of the impacted 3rd molar.
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| Class I |
Class II:
When the space between the anterior part of ramus and posterior/distal part of the second molar is less than the mesio-distal diameter of the impacted 3rd molar.
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| Class II |
Class III:
When the most of mesio-distal impacted 3rd molar is located within the ramus.
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| Class III |
2- Relative depth of third molar in bone
Position A
When the highest part of the 3rd molar is on the level or above the occlusal plane.
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| Position A |
Position B
When the highest part of the 3rd molar is below the occlusal plane, but above the cervical line of the second molar.
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| Position B |
Position C
When the highest part of the 3rd molar is below the cervical line of the second molar.
Tags
oral-surgery