Ran SJ, Yang X, Sun Z, et al. - Using finite element analysis, researchers studied the stress distribution and tooth displacement of a maxillary central incisor with various apical root resection lengths and occlusal relationships. By MicroCT, a maxillary central incisor was scanned. Using finite element analysis, more than 6 mm of apical root resection led in a marked rise in stress distribution and tooth displacement in normal and increased overjet with deep occlusal overbite interactions. Significantly increased stress distribution and tooth displacement in increased overjets or deep overbites, over 5 mm or 4 mm, respectively.