两种纤维桩表面处理方法对牙根抗折裂性能的影响

目的:对比分析不同纤维状表面处理方式对牙跟修复后抗折裂强度的影响,为临床纤维状表面处理提供参考依据。方法:将60个纤维桩按数字随机分为对照组20个、喷砂组20个和过氧化氢酸蚀组20个,将其固定于经过纤维桩道准备的离体牙内,采用相同树脂成核行全冠修复后,模拟口腔内部环境给予冷热等环境,经相同环境加载后于电子万能实验机上测试其抗折裂强度,并进行记录。结果:3组离体牙的牙齿长度、牙根长度、颈部颊舌径以及颈部近远中径军无显著差异,无论采用那种表面处理方式,离体牙受硬力后的断裂方式均以牙颈1/3处多见,说明断裂的部位和方式与纤维桩表面处理与否关系不大。喷砂组与过氧化氢酸蚀组的抗折裂强度均高于对照组(P＜0.05),但喷砂组与过氧化氢酸蚀组之间的抗折裂强度差异不大。无统计学意义。结论:喷砂与过氧化氢酸蚀的表面处理方式均能增加纤维桩的抗折裂强度,但两者之间抗折裂强度差异不大,表面处理与否与纤维桩的断裂方式无关。

Effect of Two Kinds of Fiber Post Surface Treatments on Root Fracture Resistance

Objective: To analysis different fiber post surface treatments on fracture strength of roots after restoration, and to provide a reference basis for clinical fiber post surface treatment. Methods: Sixty fiber post were randomly divided into three groups: control group, sandblasting group, and hydrogen peroxide acid group. All fiber posts were fixed in the roots in vitro using the same resin and restored with full crown. After treated with the same simulation environment with cold and hot, the flexural crack strength was tested. Results: There was no significant difference on the in vitro teeth length, root length, and neck buccolingual diameter and mesiodistal diameter of three groups, no matter surface treatment method. The most frequent fracture sites after loading was happened at cervical 1/3, which indicated no relationship existed between surface treatment and fracture location and mode. Sandblasting group and hydrogen peroxide treatment group had higher fracture strength than the control group (P<0.05), however, no difference between sandblasting group and hydrogen peroxide group. Conclusion: Sandblasting and hydrogen peroxide treatment can both enhance the fracture strength of fiber post. Surface treatment has no relationship with the fracture mode of fiber post.