Hunter A J, Hunter A R
J Prosthet Dent. 1990 Nov;64(5):548-52. doi: 10.1016/0022-3913(90)90125-v.
The terms bevel, chamfer, and shoulder are widely used to describe crown margin designs. However, as no clear definition of the essential feature(s) of each design has been universally accepted, the same term often describes margins of widely differing width and/or configuration. Similarly "bevel angles" are not consistently defined. While tradition favors the use of thinner marginal designs, many of the reasons advanced for their superiority are questionable in the light of contemporary research. Use of marginal widths beyond the absolute minimum demanded of the material may contribute to overcoming some of the persistent problems identified with fixed prosthodontic replacement of natural teeth. These include overcontour, porcelain debonds, poor esthetics, and fit. It is suggested that the problems associated with underpreparation and the potential advantages of wider preparations need reemphasis.
斜面、倒角和肩台这些术语被广泛用于描述牙冠边缘设计。然而，由于每种设计的基本特征尚无被普遍接受的明确定义，同一个术语常常用于描述宽度和/或形态差异很大的边缘。同样，“斜面角度”也没有统一的定义。虽然传统观念倾向于使用较薄的边缘设计，但根据当代研究，许多支持其优越性的理由都值得怀疑。使用超出材料绝对最小要求的边缘宽度可能有助于克服一些在天然牙固定义齿修复中一直存在的问题。这些问题包括外形过大、瓷层脱粘、美观性差和贴合度不佳。有人提出，与预备不足相关的问题以及更宽预备的潜在优势需要再次强调。
