To study the curative effect of the posterior teeth with longitudinal fracture by temporary fixation of plastic crown, the posterior teeth with longitudinal fracture was fixed with instant crown of selfcuring crylic resin, following root canal treatment and then replaced with cast crown. 为探讨塑料冠暂时固定纵折后牙的疗效,采用自凝塑料冠固定纵折后牙,牙合面钻孔行根管治疗后铸造金属全冠修复。
The results showed that the curative effect of the posterior teeth with longitudinal fracture fixed by the plastic crown was better than that by the tiny steel wire, and the method is simple. 塑料冠固定纵折后牙比单纯金属丝固定效果好,且制作简便。
Preservative Therapy of the Posterior Teeth with Longitudinal Fracture by Plastic Crown Temporary Fixation 塑料冠暂时固定纵折后牙的保存治疗
The three-dimensional plastic deformations of strip were analyzed by using the stream surface strip element method, the elastic deformations of the rolls were analyzed by using the influence coefficient method, the analyzing and computing models of shape and crown were established by combining them. 用流面条元法分析带材的三维塑性变形,用影响系数法分析辊系的弹性变形,将两者耦合,建立了四辊轧机板形和板凸度的分析计算模型。