Radiographic Position of Impacted Mandibular Third Molars and Their Association with Pathological Conditions

Figure 2

The impaction depth classified according to the Pell and Gregory classification with respect to the occlusal plane. Class A: the highest part of the mandibular third molar is located on the same level or above the occlusal plane of the adjacent second molar. Class B: the highest part of the mandibular third molar is located between the occlusal plane and the cervical line of the second molar. Class C: the highest part of the mandibular third molar is located below the cervical line of the second molar.