Fig. 1

Cracked 2nd mandibular molar diagnosed following the placement of an implant-supported rehabilitation in the adjacent area. a A mandibular left 2nd molar tooth at time of placement of a mesial implant. There were no clinical or radiographic signs of pathology. b After 14 months, the patient presented with pain and discomfort during mastication in the lower left quadrant. The mandibular left 2nd molar tooth was diagnosed with deep periodontal pockets, pulp necrosis, and apical periodontitis. c Following the removal of coronal restorations, a surgical operating microscope can be used to confirm the presence and extent of the crack