Shoulder preparations for collarless metal ceramic crowns: hand-planning as opposed to rotary instrumentation.
Shoulder preparations for collarless metal ceramic crowns: hand-planning as opposed to rotary instrumentation.
复制标题
无环金属陶瓷冠的肩部准备：手工规划而不是旋转器械。
DOI：
10.1016/0022-3913(89)90331-4
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
J. V. von Fraunhofer
中科院分区：
文献类型：
--
作者：
R. Zena;Z. Khan;J. V. von Fraunhofer
这项研究是为了确定手工刨平牙周面底部是否改善了无领金属烤瓷冠的整体适合性和边缘适合性。拔除的中切牙按常规方法制备。这颗牙齿用定制的托盘制作了不同的印模，并浇注在石头中。用硅胶印模材料作为粘固剂制作全冠。硅胶膜被捕获在石头中并切片。测量颊、舌面6个点的膜厚度。然后，通过手工刨边缘来修改牙齿，使其表面光滑、平整，并重复上述步骤。结果发现，对于手工刨削的边缘，以粘固膜厚度衡量的全冠适合性在面缘、面、舌侧切面和舌面均有显著改善(p<；0.05)。
This study was undertaken to determine whether hand-planing the gingival facial floor improved the overall fit and marginal adaptation of a collarless metal ceramic crown. An extracted central incisor was prepared conventionally. Separate impressions were made of the tooth with custom trays and poured in stone. Crowns were constructed and cemented with silicone impression material as the luting agent. The silicone film was captured in stone and sectioned. Film thickness was measured at six points on the buccal and lingual surfaces. The tooth was then modified at the gingival floor by hand-planing the margin to a smooth, flat finish, and the above procedures repeated. It was found that the fit of crowns as measured by the cement film thickness was significantly better (p< 0.05) at the facial margin, facial, lingual incisal, and lingual surfaces for the hand-planed margins.