牙体剩余量对纤维桩核全冠修复体折裂模式的影响

发布时间：2018-05-06 00:30

本文选题：桩核技术 + 牙冠(假体)　；参考：《中国组织工程研究》2015年43期

【摘要】：背景:研究表明,桩的植入和牙体剩余量的不同会改变残根内牙本质的应力分布模式,并对桩核修复体的折裂模式产生影响。目的:评价进行纤维桩复合树脂核全冠修复时,在斜向加载条件下牙体剩余量对牙根折裂模式的影响。方法:获取正畸拔除的人单根前磨牙40颗,行根管预备及填充后随机均分为4组,以通过颊侧和舌侧釉质牙骨质界中点并垂直于牙体长轴的平面为参照平面,使得牙体剩余量分别为0,1,2,3 mm,行纤维桩复合树脂核金属全冠修复。修复后进行速率为1 mm/min的45°斜向加载,记录牙根出现折裂时的折裂模式和加载-位移曲线。结果与结论:0 mm组多发生牙颈部折裂,其余3组多发生根中部折裂,0 mm组的总折裂模式与其余3组比较差异有显著性意义(P0.05),1,2,3 mm组间总体折裂模式比较差异无显著性意义(P0.05)。在斜向加载条件下,当剩余牙体较少时,修复体易发生牙颈部折裂,纤维桩对牙根起到了保护作用,但临床失败概率增加;随着牙体剩余量的增加,折裂模式发生改变,从颈缘向根方转移。表明临床上对残根行纤维桩核冠修复时,应尽量保留冠部较多的牙体组织。
[Abstract]:Background: it has been shown that the stress distribution pattern of dentin in residual root will be changed and the fracture mode of post and core prosthesis will be affected by the difference between post implantation and residual amount of tooth. Objective: to evaluate the effect of residual amount of teeth on root fracture mode in the restoration of fiber post composite resin core crown under oblique loading. Methods: forty human premolars extracted by orthodontic treatment were randomly divided into 4 groups after root canal preparation and filling. The residual amount of the tooth was 0 ~ 1 ~ 2 ~ 2 ~ 3 mm, respectively, and the composite resin core metal crown was used to repair the tooth. After restoration, 45 掳oblique loading at the rate of 1 mm/min was carried out, and the fracture mode and load-displacement curve of the root were recorded. Results and conclusion the cervical fracture of teeth was more common in the 0 mm group than in the other three groups. There was no significant difference in the total fracture pattern between the 0 mm group and the other three groups. There was no significant difference in the total fracture pattern between the two groups. Under the condition of oblique loading, when the residual teeth are less, the restoration is prone to fracture in the neck, and the fiber post has a protective effect on the root, but the probability of clinical failure increases, and the fracture pattern changes with the increase of the residual amount of the tooth. Transfer from the cervical margin to the root. It is suggested that more teeth should be preserved in the restoration of the residual root with fibrous post and core crown.
【作者单位】：中山大学附属第一医院口腔科;广东省中医二院口腔科;
【基金】：广东省科技厅社会发展项目(2011B080701010;2012B061700066)~~
【分类号】：R783.3

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