根管内壁酸蚀处理对桩核冠修复后牙根抗折性能影响的体外实验研究  

In vitro study of the fracture resistance of teeth restored with cast post and core with acid etched root canal wall surfaces

作　　者：马晓妮[1] 高旭[1] 徐欣[1] 

机构地区：[1]山东大学口腔医院种植中心,山东省口腔生物医学重点实验室,山东济南250012

出　　处：《口腔医学》2014年第3期178-180,共3页Stomatology

摘　　要：目的研究铸造桩表面酸蚀处理对牙根抗折性能的影响。方法 32颗近期拔除的单根第一前磨牙,根管治疗后于釉牙骨质界冠方1.5 mm截冠,铸造桩核及金属全冠修复,随机分为4组。实验组根管内表面酸蚀分别酸蚀10、30、60 s,对照组不作处理。所有样本处理完成后均以磷酸锌水门汀粘固。试件包埋于丙烯酸树脂块中,在电子万能实验机上进行测试。结果实验组牙根折裂强度分别为(2.981±0.102)kN、(3.097±0.084)kN、(3.128±0.071)kN,对照组牙根折裂强度为(2.699±0.445)kN,各实验组与对照组间差异均具有统计学意义(P<0.05)。结论对根管内表面进行酸蚀处理可以提高桩核冠修复后牙根的抗折强度。Objective An in vitro study was conducted to measure the fracture resistance of teeth restored with casting post and core with acid etched surfaces. Methods Thirty-two recently extracted single root first premolars were endodontically treated and randomly divided irlto four groups. Crown truncation was performed at cemento-enamal junction 1.5 rum coronally. All of the specimens received casting post and core and metal all crowns. In the testing groups,root canal walls were acid etched respectively for 10 s,30 s and 60 s, while root canal walls in the control group were not. Each specimen was cemented with zinc phosphate cement, embedded in acrylic resin,and tested in a universal material testing machine. Results The fracture loads of roots were （2. 981 ± 0. 102 ） kN, （3. 097 ± 0. 084） kN, （3. 128 ± 0.071 ） kN in testing groups and （2. 699 ± 0. 445 ） kN in control group. There was statistical difference between all testing groups and control group （ P 〈 0.05 ）. Conclusions Acid etching on root canal walls results in significantly higher fracture resistance of roots after post-core and crown restoration.

关 键 词：铸造桩 抗折性能 酸蚀 

分 类 号：R783.3[医药卫生—口腔医学]