This high-yield revision note on Impacted Third Molars: Winter’s & Pell-Gregory Classifications covers everything examiners typically test under Oral Surgery — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Classification | Basis | Categories |
|---|---|---|
| Winter's classification | Angulation of the impacted tooth relative to the long axis of the 2nd molar | Mesioangular (MOST COMMON, easiest to extract), Distoangular (MOST DIFFICULT), Vertical, Horizontal, Transverse, Inverted |
| Pell & Gregory - Class (space available) | Relationship of impacted tooth to the anterior border of the ramus | Class I (adequate space anterior to ramus), Class II (partial space), Class III (impacted mostly within ramus - most difficult) |
| Pell & Gregory - Position (depth) | Depth of impaction relative to occlusal plane of 2nd molar | Position A (level with occlusal plane), Position B (between occlusal plane and cervical line), Position C (below cervical line - most difficult, deepest) |
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