Block P L
J Prosthet Dent. 1987 Jun;57(6):683-9. doi: 10.1016/0022-3913(87)90363-5.
The indiscriminate placement of the margins of dental restorations into the gingival crevice for the purpose of esthetics or protection from decay can no longer be considered good practice. The junctional epithelium and the supracrestal fibers, together, have been called the biologic width, which is considered to have a length of 2 mm. A more accurate term for the biologic width, one that expresses the function and diversity of the component tissues while avoiding reference to dimension, is the "subcrevicular attachment complex." The most accurate anatomic structure from which to take measurements for margin placement is the healthy, stable gingival margin. It is clinically visible, unlike the biologic width, and should replace the latter as the landmark of choice for placing dental margins. Surgical crown lengthening will be necessary when restorations will end at or below the alveolar crest.
为了美观或防止龋齿而将牙齿修复体边缘随意置于龈沟内的做法，已不再被视为良好的操作。结合上皮和龈嵴上纤维共同构成了所谓的生物学宽度，其长度被认为是2毫米。对于生物学宽度，一个更准确的术语是“龈沟下附着复合体”，它在表达组成组织的功能和多样性的同时，避免了提及尺寸。用于确定边缘位置的最准确解剖结构是健康、稳定的牙龈边缘。与生物学宽度不同，它在临床上是可见的，应取代生物学宽度作为确定牙齿边缘位置的首选标志。当修复体止于牙槽嵴或其下方时，需要进行外科冠延长术。
