Ohm E, Silness J
J Oral Rehabil. 1978 Oct;5(4):371-5. doi: 10.1111/j.1365-2842.1978.tb01256.x.
The bucco-lingual and mesio-distal convergence angles in vital and rootfilled teeth prepared for complete crowns were measured microscopically on 190 stone dies. In vital teeth the mean convergence angles varied between approximately 19 and 27 degrees. In rootfilled teeth the mean angles varied between 12 and 37.
在190个石膏模型上,用显微镜测量了为全冠修复制备的活髓牙和根管充填牙的颊舌向及近远中向聚合角度。活髓牙的平均聚合角度在约19度至27度之间变化。根管充填牙的平均角度在12度至37度之间变化。