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铸造全冠固位力不仅受粘接介质力学性能的影响,还与预备体表面及修复体几何形态有关。本研究采用金钢砂针、碳化钨钢修整钻和带齿碳化钨钢钻对牙体进行预备,选用磷酸锌、玻璃离子和Panavia-EX树脂粘接剂进行粘接,考察牙面粗糙度对全冠固位力的影响。 选取90个拔除的、具有相似大小的完整磨牙,随机分为3组牙体预备,完成全冠试件。然后将每一组试件再随机分成3组,分别用磷酸锌、玻璃离子和Panavi
The casting crown retention force is not only affected by the mechanical properties of the bonding medium, but also with the preparation of body surface and restoration geometry. In this study, the preparation of dental caries was performed using a gold sand needle, a tungsten carbide steel dressing drill and a carotid tungsten carbide drill. Zinc phosphate, glass ions and Panavia-EX resin adhesive were used for adhesion. The tooth surface roughness Crown crown retention effect. Ninety intact molars of similar size were selected and randomly divided into three groups to prepare the whole crown. Then each group of specimens were randomly divided into three groups, respectively, with zinc phosphate, glass ions and Panavi