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External Invasive Resorption. Periapical radiographs showing examples of the four stages of this type of resorption, according to Heithersay (1999b). (A) Class 1—mesial surface of tooth 36 and distal surface of tooth 35; (B) Class 2—distal and labial surfaces of tooth 23; (C) Class 3—palatal surface of tooth 13; (D) Class 4 mesial, buccal and lingual surfaces of tooth 34
