两种预成桩拉伸固位强度的体外研究  

In Vitro Comparison of Retention of Dental Cements to Prefabricated Posts

作　　者：李洪波[1] 李四群[1] 王贻宁[1] 

机构地区：[1]武汉大学口腔医学院修复科,湖北武汉430079

出　　处：《口腔医学研究》2006年第1期78-80,共3页Journal of Oral Science Research

摘　　要：目的:比较用树脂粘接剂粘接的纤维增强复合树脂预成桩与用磷酸锌粘固的不锈钢预成桩的拉伸固位强度。方法:选择40颗因正畸拔除的下颌前磨牙,用金刚砂片在距釉牙骨质界冠方1 mm处去除牙冠,随机均分为4组,用预成桩配套用车针预备9 mm深的桩腔。对于不锈钢桩组,桩腔预备的直径为1.25 mm,用磷酸锌粘固粉粘固。对于纤维增强复合树脂桩组,桩腔预备的直径分别为1.00 mm、1.25 mm、1.50 mm,用树脂粘接剂粘接。储存24 h后,置于拉伸强度检测机上测量各组样本预成桩的拉伸固位强度,加载速度为5.0mm/m in,对各组的测量结果进行统计学分析。结果:各组预成桩的平均固位强度在(43.9±10.4)kg至(19.9±5.7)kg之间,磷酸锌粘固的不锈钢桩组的拉伸固位强度显著高于所有纤维桩组,1.00 mm纤维增强复合树脂桩组的固位强度明显低于其它组。结论:在本实验的研究条件下,磷酸锌粘固的不锈钢桩组固位强度最高。Objective： To compare the tensile bond strength between composite fiber -reinforced dowels luted with a resin cement and stainless steel dowels luted with zinc phosphate cement. Methods： 40 extracted human mandibular premolars were removed clinical crown 1 mm coronal to the cementoenamel junction. The teeth were randomly divided into 4 groups. A post space was prepared in each specimen to a depth of 9 mm, using the drill supplied by the respective manufacturer. For the stainless steel post group, 1.25mm diameter posts were cemented with zinc phosphate cement. For the composite fiber reinforced groups, posts with diameters of 1.00, 1.25, and 1.50 mm were luted with a resin bonding system according to manufacturer specifications. The specimens were placed in a fixture of 801 Materials Test Systems machine, and loaded in tension at a rate of 5.0 mm/min until failure. Results ： The stainless steel post luted with zinc phosphate cement provided significantly greater tensile resistance than all composite fiber dowel groups. The retention of the 1.00mm composite fiber - reinforced post was significantly less than other groups. Conclusion： Under the conditions of this study, the stainless steel dowel luted with zinc phosphate cement provided significantly greater retention.

关 键 词：预成桩 粘接剂 拉伸固位强度 体外研究 

分 类 号：R783.3[医药卫生—口腔医学]