Patel Paresh B, Wildgoose David G, Winstanley Raymond B
Department of Adult Dental Care, School of Clinical Dentistry, Claremont Crescent, Sheffield, UK.
Eur J Prosthodont Restor Dent. 2005 Sep;13(3):100-4.
This study compares the convergence angle of preparations for posterior gold crowns made by fourth/ fifth year undergraduate dental students, clinical teaching staff and general dental practitioners. Sixty dies were cast from impressions previously taken of clinical preparations by clinicians within each of the four groups. Each die was trimmed and sectioned in both mesio-distal and bucco-lingual planes before being projected using an overhead projector, thereby enabling the convergence angle silhouette to be measured. The results show the greatest convergence angle range to be produced by the least experienced students (10 degrees - 82 degrees). However, no significant difference (p > 0.05) was found when students with one further year of experience were compared to experienced staff. The degree of conformity to the ideal taper (4 degrees - 14 degrees) was no greater than 50% for any of the groups.
本研究比较了牙科本科四年级/五年级学生、临床教师和普通牙科医生制作的后牙金冠修复体的聚合角度。从四个组中每组临床医生之前采集的临床预备体印模上铸造出60个代型。每个代型在近远中面和颊舌面进行修整和切片，然后用投影仪进行投射，从而能够测量聚合角度轮廓。结果显示，经验最少的学生制作的修复体聚合角度范围最大（10度 - 82度）。然而，将多一年经验的学生与经验丰富的工作人员进行比较时，未发现显著差异（p > 0.05）。任何一组符合理想锥度（4度 - 14度）的程度均不超过50%。
