摘要
背景:纤维桩由于其弹性模量与牙本质相似,能有效分散应力,且具有良好的美学性能,被认为是金属桩的很好替代品,并广泛应用于临床。但是,纤维桩与树脂核界面经常会出现粘结失败,因此改进纤维桩的性能以避免这种粘结失败是非常有意义的。目的:比较纤维桩经3种不同表面处理后与树脂粘结材料的粘结强度。方法:20个下颌单根管离体牙截冠后行根管充填和桩道预备,随机分为4组,纤维桩表面在粘固前分别行硅烷化处理,喷砂处理和过氧化氢酸蚀处理,对照组不作任何处理。将处理后的纤维桩用粘结剂粘结于根管内并形成树脂核。实验牙进行循环加载和冷热循环后,将牙根切割为厚1mm的试件,用万能实验机测试其粘结强度。测试后的试件置于光学显微镜下观察断裂方式。结果与结论:喷砂处理组和过氧化氢酸蚀组的粘结强度明显高于对照组(P<0.05)。喷砂处理组和过氧化氢酸蚀组之间的粘结强度差异无显著性意义(P>0.05)。硅烷化处理组与对照组之间粘结强度差异无显著性意义(P>0.05)。各组粘结材料与纤维桩之间的粘接破坏为最主要的断裂方式。结果证实喷砂处理和过氧化氢酸蚀处理均能提高纤维桩与树脂粘结材料的粘结强度,而硅烷化处理并不能提高纤维桩在根管内的粘结强度。
BACKGROUND：Fiber posts are currently perceived as promising alternatives to cast metal posts,as their elastic modulus are similar to that of dentin,producing a favorable stress distribution and providing more esthetic outcomes for endodontically treated teeth.Failure of a fiber post and composite resin core often occurs at the junction between the two materials.This failure process requires better characterization.OBJECTIVE：To compare the bond strength of fiber posts after three surface treatments to a composite resin.METHODS：The coronal portions of 20 mandibular premolars with a single root canal were removed and were endodontically treated.After post space preparation,the roots were divided into four groups and the fiber posts and resin cores were lured.In the three testing groups,the surfaces of fiber posts were silaned,sandblasted or etched with hydrogen peroxide.In the control group,the surfaces of fiber posts were not treated.All specimens were exposed to cyclic loadings and thermal cycles.The roots were sectioned into slices with 1 mm thickness and their bond strengths were tested with a universal material testing machine.Test piece following testing was placed under optical microscope to observe the breakage method.RESULTS AND CONCLUSION：Stickiness strength was significantly greater in the sandblasted and hydrogen peroxide groups compared with the control group（P0.05）.No significant difference in stickiness strength was determined between the sandblasted and hydrogen peroxide groups（P0.05）.No significant difference in stickiness strength was detected between the silaned and control groups（P0.05）.The splicing destruction among each group was the main breakage method between materials and fiber posts.The surface treatment of fiber posts with sandblast or hydrogen peroxide significantly enhanced the bond strength of the composite resin tested.The surface treatment of fiber posts with silane did not enhance the bond strength of the composite resin.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2010年第3期457-460,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
