Bartha K, Dobó N C, Bernáth M, Szabó J
Semmelweis Orvostudományi Egyetem, Konzerváló Fogászati Klinika, Budapest.
Fogorv Sz. 1995 Jun;88(6):199-204.
If extracted human teeth are used for comparative study of root canal preparatory instruments the selection of roots into homogeneous test groups is decisive step of the experiment. On the basis our pilot USDA it is necessary not only to consider the Schneider angle and the length of root canal curvature but the surface area of root canals on the mesio-distal and oro-vestibular radiographs showing the projected view of the canals.
如果将拔除的人牙用于根管预备器械的对比研究，那么将牙根选入同质试验组是实验的关键步骤。基于我们初步的美国农业部研究，不仅有必要考虑施奈德角和根管弯曲长度，还需考虑在近远中及口前庭X光片上显示根管投影的根管表面积。
