论文部分内容阅读
桩核冠是临床中经常应用的一种桩核与冠的复合修复体,它的使用使一些残根、残冠得以保留,同时使一些牙列缺损的固定修复得以实现。但是,在临床实际应用中却会出现一些错误,使修复失败。笔者在进行了380例桩核冠修复治疗的临床观察后,从桩核的设计、牙体及牙体边缘的预备以及在适应证的选择等方面出现错误导致的修复失败加以分析。 1 桩核的设计不合理 1.1 桩核的直径设计有误:①根桩直径太细,与根管壁接触面积减少,摩擦力下降,根桩受到的拉应力较大,受侧向力时,固位不良,临床上常见的一
Post-core crown is a kind of composite prosthesis with post-core and crown, which is often used in clinical practice. Its use keeps some residual roots and residual crowns and at the same time enables the fixation and repair of some dentition defects. However, there are some mistakes in clinical practice that make the repair fail. After carrying out the clinical observation of 380 cases of post-core crown restoration, the author analyzed the failure of repair caused by the design of post-core, preparation of the edge of tooth body and tooth, and the selection of indications. 1 The design of the post and core is unreasonable 1.1 The design of the diameter of the post and core is wrong: ① The diameter of the root post is too thin, the contact area with the root canal wall is reduced, the frictional force is decreased, and the tensile stress to the root post is larger, Poor retention, a common clinical