Evaluation of a ceramics dowel-core system

把一个陶瓷销钉芯系统粘在模型上。在正中面切断并测量骨水泥膜厚度。作为核心和边缘的测量结果是最小5 μm最大90 μm。尖缘型根管口与瓷核的吻合性差，最大粘固剂膜厚度为200 μm。桩端骨水泥膜厚度为5-50 μm。桩尖部分的粘固剂膜厚度为50 μm和8μm。使用Superbond将陶瓷桩核系统胶合到模型上，并使用万能试验机从120.8°角度进行抗压强度测试。陶瓷桩核系统的平均最大断裂载荷为27.4°kgf（SD：9.2），预制桩复合核（对照）的平均最大断裂载荷为30.2kgf（SD：8.8）。陶瓷桩核系统和对照组在载荷作用下均发生了牙体边缘和牙冠边缘的断裂。尽管如此，所有样本的断裂类型没有显著差异。此外，在陶瓷核或现有根管桩与陶瓷核之间的连接处未检测到断裂和开裂。这些结果表明，陶瓷桩核系统的有用性相当于或高于对照。

Glued a ceramic dowel core system to a model. Cut off at median plane and measured a cement film thickness. As a result of measuring of a core and a margin was minimum 5 μm maximum 90 μm. The fitting of root canal orifice wihich was a sharp edge and a ceramics core were bad, and the maximal cement film thickness was 200 μm. The cement film thickness of a post-part was 5-50 μm. The cement film thickness for a part of apex of post was 50 μm and 8μm. The ceramic dowel core system were glued to a model using Superbond, and a compressive strength was conducted from an angle of 120.8°using a universal testing machine. The average maximum fracture load was 27.4°kgf(SD : 9.2) for the ceramic dowel core system and 30.2kgf(SD : 8.8) for the prefabricated post ＆ composite core (the control). Fracture occurred at the tooth margin and the crown edge on the side to which the load was applied in the ceramics post-core system and the control. Nonetheless, the type of fracture did not differ significantly among all specimens. In addition, fracture and cracking were not detected in the ceramic core or at the joint between the existing root-canal post and the ceramic core. These findings suggest that the usefulness of the ceramic dowel core system is equivalent to or higher than that of the control.