Tooth preparations for complete crowns: An art form based on scientific principles
Tooth preparations for complete crowns: An art form based on scientific principles
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DOI：
10.1067/mpr.2001.114685
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发表时间：
2001-04-01
影响因子：
4.6
通讯作者：
Aquilino, SA
中科院分区：
文献类型：
--
作者：
Goodacre, CJ;Campagni, WV;Aquilino, SA
问题的陈述。最近没有文献回顾当前关于全覆盖牙预备的科学知识。目的。本文追溯了全覆盖牙齿预备的历史演变，并确定了科学牙齿预备的指南。材料和方法。回顾了涵盖 250 年临床实践的文献，重点是过去 50 年获得的科学数据。 MEDLINE 搜索和广泛的手动搜索均用于查找过去 50 年来用英文撰写的相关文章。结果。牙齿应准备好，使其表现出以下特征：总咬合收敛度为 10 至 20 度，磨牙的最小咬合颈尺寸为 4 毫米，其他牙齿的最小咬合颈尺寸为 3 毫米，咬合颈与面舌尺寸之比为 0.4 或更大。应尽可能保留面近端和舌端线角度。当缺少上述特征时，应使用辅助阻力特征（例如轴向凹槽或盒子）对牙齿进行修改，最好是在近端表面上。终点线的选择应基于牙冠/保持器的类型、美观要求、形成的难易程度和个人经验。最近的研究无法验证对某些终点线增强边缘拟合的期望。审美要求和牙齿状况决定了相对于牙龈的终点线位置，其中龈上位置更可接受。线角应该是圆角的，并且需要合理的表面光滑度。结论。已制定九项科学原理，确保全覆盖修复体的牙齿预备在机械、生物和美学方面取得成功。
Statement of the problem. No recent literature has reviewed the current scientific knowledge on complete coverage tooth preparations.Purpose. This article traces the historic evolution of complete coverage tooth preparations an identifies guidelines for scientific tooth preparations.Material and methods. Literature covering 250 years of clinical practice was reviewed with emphasis on scientific data acquired during the last 50 years. Both a MEDLINE search and an extensive manual search were used to locate relevant articles written in English in the last 50 years.Results. Teeth should be prepared so that they exhibit the following characteristics: 10 to 20 degrees of total occlusal convergence, a minimal occlusocervical dimension of 4 mm for molars and 3 mm for other teeth, and an occlusocervical-to-faciolingual dimension ratio of 0.4 or greater. Facioproximal and linguoproximal line angles should be preserved whenever possible. When the above features are missing, thee teeth should be modified with auxiliary resistance features such as axial grooves or boxes, preferably on proximal surfaces. Finish line selection should be based on the type of crown/retainer, esthetic requirements, ease of formation, and personal experience. Expectations of enhanced marginal fit with certain finish lines could not be validated by recent research. Esthetic requirements and tooth conditions determine finish line locations relative to the gingiva, with a supragingival location being more acceptable. Line angles should be rounded, and a reasonable degree of surface smoothness is desired.Conclusion. Nine scientific principles have been developed that ensure mechanical, biologic, and esthetic success for tooth preparation of complete coverage restorations.