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- 2018
CAD/CAM一体成型纤维桩核对修复下颌前磨牙漏斗状根管的桩核适合性及抗折性能的影响
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Abstract:
摘要 目的 对比计算机辅助设计与制作一体成型纤维桩核和预成纤维桩联合树脂间接法制备桩核,对修复下颌前磨牙漏斗状根管的桩核适合性及抗折能力的影响.方法 将22 颗大小相近的单根下颌前磨牙统一制备为漏斗状根管,用随机数表法随机平均分成两组:A组用计算机辅助设计与制作一体成型纤维桩核;B组用预成纤维桩联合树脂间接法制备桩核,两组统一铸造金属全冠修复.每组中随机抽取 1 颗以垂直样本牙长轴方向制成牙切片于扫描电镜下观察两组样本牙不同部位横断界面的桩核适合性;其余样本牙包埋后通过万能试验机,以速度1.00 mm/min对30°倾斜牙体功能尖进行加载并记录试件断裂时的最大载荷与折裂方式.结果 A组桩核根颈部、根中部、根尖部3个部位的根管适合性均显著优于B组;两组最大抗折载荷相比,A组(530.50±43.59)N>B组(351.10±38.88)N,有显著差异(F=94.34,P<0.001).结论 计算机辅助设计与制作一体成型纤维桩核修复下颌前磨牙漏斗状根管具有较好的根管适合性和较高的抗载荷性能.
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