Pell and Gregory classification (Impacted 3rd mola...
Class A maxilla 3rd molar impaction: The occlusal plane of the impacted tooth is at the same level as the adjacent tooth.
Class A
Class A mandible 3rd molar impaction: The occlusal plane of the impacted tooth is at the same level as the adjacent tooth.
Class B
Class B maxilla 3rd molar impaction: The occlusal plane of the impacted tooth is between the occlusal plane and the cervical line of the adjacent tooth.
Class B
Class B mandible 3rd molar impaction: The occlusal plane of the impacted tooth is between the occlusal plane and the cervical line of the adjacent tooth.
Class C
Class C maxilla 3rd molar impaction: The occlusal plane of the impacted tooth is apical to the cervical line of the adjacent tooth.
Class C
Class C mandible 3rd molar impaction: The occlusal plane of the impacted tooth is apical to the cervical line of the adjacent tooth.
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