Hisamitsu H, Iwaku M, Fusayama T
J Dent Res. 1978 Mar;57(3):484-94. doi: 10.1177/00220345780570031601.
The dimensional factors of the cervical undercut of the human teeth were measured. The facial and lingual undercuts showed considerable deviations in depth, width, and inclination to the crown axis and the food stream. The proximal undercuts showed a uniform depth of 1 +/- 0.3 mm with some deviations in width and inclination.
测量了人类牙齿颈部倒凹的尺寸因素。颊侧和舌侧倒凹在深度、宽度以及与牙冠轴和食物流的倾斜度方面存在显著差异。邻面倒凹的深度均匀,为1±0.3毫米,宽度和倾斜度有一些差异。