Noonan J E, Goldfogel M H
University of Colorado, School of Dentistry, Denver.
J Prosthet Dent. 1991 Nov;66(5):706-8. doi: 10.1016/0022-3913(91)90457-8.
This research report used a simple and accurate method of measuring the convergence of full veneer crown preparations. A random sample of 909 dies was selected from all dies of full veneer crown preparations done at the University of Colorado, School of Dentistry student clinic over a 6-year period. All preparations were accomplished by third- and fourth-year dental students under either normal clinic conditions or under special (proficiency) testing conditions. The mean convergence angles were 19 degrees (S.D. +/- 9.8 degrees) for nonexamination conditions and 15.7 degrees (S.D. +/- 5.5 degrees) for examination procedures. These angles are far in excess of those normally recommended in the fixed prosthodontic textbooks. The values obtained in this investigation agree with the findings of most of the current published studies on the subject.
本研究报告采用了一种简单且准确的方法来测量全冠修复体预备体的聚合度。从科罗拉多大学牙科学院学生诊所6年期间所做的全冠修复体预备体的所有模型中随机抽取909个模型。所有预备体均由三、四年级牙科学生在正常临床条件或特殊（熟练程度）测试条件下完成。非检查条件下的平均聚合角为19度（标准差±9.8度），检查程序下为15.7度（标准差±5.5度）。这些角度远远超过了固定义齿修复学教科书中通常推荐的角度。本调查中获得的值与当前关于该主题的大多数已发表研究结果一致。
