摘要
目的 研究不同修复方式对不同面积楔状缺损抗折强度的影响.方法 60 颗下颌第一前磨牙随机分成 6 组,制备两种缺损面积的蝶形缺损,其中A1、B1 组充填树脂作为对照,A2、A3 和B2、B3 按缺损面积在 1/3 以内、大于 1/3 小于轴角和桩核、桩核冠修复分组.进行 10000 次人工老化处理后,采用万能材料试验机垂直加载,记录最大载荷数值并分析折裂模式.结果 当缺损面积<1/3 时,A1(935.24±50.21)N与A2(950.53±61.23)N、A3(943.35±23.48)N抗折强度差异无统计学意义,当缺损面积>1/3 且小于轴角时,B1(867.38±45.79)N与B2(903.20±43.08)N,B3(920.52±82.98)N间差异有统计学意义,B2 与B3 间差异无统计学意义.除B2 与B1、B3 之间折裂模式有差异外,其余无差异.结论 当缺损面积<1/3 时,直接树脂充填即可,当缺损面积>1/3 小于轴角时,可增加纤维桩来进一步提高抗折强度.全冠修复可能会导致不可修复性折裂的发生,是否制作全冠应慎重决定.
Abstract
Objective To compare the effects of different repair methods on different types of wedge-shaped defects.Methods Sixty mandibular first premolars were divided into six groups.The fracture resistance and failure patterns after thermo-cycling(10000 times)were compared.Results There was no statistical differences in fracture resistance among group A1(935.24±50.21)N,A2(950.53±61.23)N and A3(943.35±23.48)N,but the differences among group B1(867.38±45.79)N,B2(903.20±43.08)N and B3(920.52±82.98)N were significant.There were significant differences in failure pattern among B2,B1 and B3.Conclusions When the wedge defect area is less than 1/3,direct resin filling can achieve good repair effect.when the wedge defect area is more than 1/3 but does not exceed the axial angle,fiber post can be added to further improve fracture resistance.
基金项目
河北省卫生健康委医学科学研究课题(20210097)
NETL
NSTL
万方数据