Mack P J
J Oral Rehabil. 1980 May;7(3):255-65. doi: 10.1111/j.1365-2842.1980.tb00443.x.
The minimum angles of taper that can in theory be formed to various preparations were established for representative dental preparations and operating distances. These values were compared with the taper of dental preparations formed both under laboratory conditions and in clinical practice, the latter by measurement of taper on the dies of clinically successful crowns and inlays. A possible explanation for the discrepancy noted between recommended degrees of taper and the tapers produced under clinical conditions was considered to be due to the requirement by a dental surgeon to avoid forming undercuts to the line of withdrawal of a cast intracoronal or extracoronal retainer.
针对典型的牙体预备和操作距离，确定了理论上可形成的针对各种预备体的最小锥度角。将这些值与在实验室条件下以及临床实践中形成的牙体预备锥度进行了比较，临床实践中的锥度是通过测量临床成功的冠和嵌体的代型来确定的。临床条件下产生的锥度与推荐的锥度之间存在差异，一种可能的解释被认为是由于牙科医生需要避免在铸造的冠内或冠外固位体的就位道上形成倒凹。
