纤维桩表面处理对其修复后牙根抗折裂强度的影响

Effects of surface treatment on the fracture resistance of teeth restored with fiber posts and core system

目的评价不同的纤维桩表面处理方法对纤维桩修复后牙根抗折裂性能的影响。方法将24根纤维桩平均分为喷砂组、过氧化氢酸蚀组和未处理组(对照组),分别将其黏固于24颗经过桩道预备的离体牙内,树脂成核,然后行金属全冠修复。模拟口腔环境将样本进行冷热循环和循环加载,然后置于电子万能实验机上测试其抗折裂强度,记录样本折裂时的力值以及折裂模式。结果纤维桩表面处理组的牙根抗折裂强度均大于未处理组(P<0.05),而喷砂和过氧化氢处理组之间的牙根抗折裂强度的差异无统计学意义(P>0.05)。各组的折裂模式均以根颈1/3处折裂为主。结论喷砂和过氧化氢酸蚀处理均能提高纤维桩加树脂核修复后的牙根的抗折裂强度。

Objective To evaluate the effects of different surface treatment on the fracture resistance of teeth res-tored with fiber posts and core system.Methods 24 fiber posts were divided into three groups according to different surface treatment techniques,including sandblasting,etching with hydrogen peroxide,and no treatment performed（the control group）.All fiber posts were luted with a composite resin luting agent in the canal roots.The teeth were res-tored with composite resin cores and metal crowns.After cementation,the teeth were subjected to simulated aging conditions consisting of mechanical loading cycles and thermal cycles.All teeth were loaded in a mechanical testing machine,and the fracture load and fracture mode of each teeth were recorded.Results The fracture resistances of sandblasting and hydrogen peroxide groups were higher than the control group（P0.05）,while the fracture resistances of two test groups had no significant differences（P0.05）.Fracture modes of all fiber post groups were nearer to the coronal third of the root.Conclusion Sandblasting and etching with hydrogen peroxide can improve the fracture re-sistance of teeth.