摘要
目的:比较循环加载对Fuji I(FUI)、Fuji Cem(FUC)、RelyXTMUnicem(RXU)和RelyXTM ARC(RXA)4种水门汀材料与玻璃纤维桩的粘固性能影响。方法:选取80个新鲜拔除的无龋损单根管人前磨牙,常规根管充填和桩道预备后随机分为4组(n=20),分别用4种不同水门汀将直径为1.9 mm的玻璃纤维桩粘固于相应组的根管内;分别于循环加载前和循环加载10万次后检测各组粘结试件的拉出强度,扫描电镜(SEM)观察其粘结界面的微观形貌。结果:循环加载前各组的即刻拉出强度以RXA组最高(277.500±26.072)N,随后依次为RXU(218.570±12.366)N、FUC(104.300±23.112)N和FUI组(73.150±8.187)N,各组间两两相比P<0.05;循环加载后FUI、FUC组的拉出强度显著增高(P<0.05),RXA组拉出强度显著降低(P<0.05),RXU组变化不显著(P>0.05);SEM观察显示:循环加载前后FUI和FUC两组粘结界面较加载前更致密,而RXA和RXU两组较加载前更为松散。结论:不同水门汀材料对玻璃纤维桩的粘固性能存在显著差异,循环加载可增强FUI、FUC与玻璃纤维桩的粘结耐久性。
AIM： To study the bond strength of Fuji I （FUI）, Fuji Cem （FUC）, RelyXTM Unicem （RXU） and RelyXTM ARC （RXA） to glass fiber posts before and after cyclic loading. METHODS： 80 freshly extracted sound single-rooted-canal human premolars were used. After root canal treatment and post space preparation, they were randomly divided into 4 groups（ n = 20）. Then the 4 different cements were used respectively to bond fiber posts with the diameter of 1.9 mm. Specimens of every group were prepared for immediate Pull-out test with a universal testing ma- chine and observed by scanning electron microscopy （SEM） before and after cyclic loading for 100000 times. RESULTS： The immediate bond strength（N） of RXA, RXU, FUC and FUI group was 277. 500 ± 26. 072, 218. 570 ±12. 366, 104. 300 ±23.112 and 73. 150 ± 8. 187 respectively （between each 2 groups, P 〈 0.05 ）. After cyclic loading the bond strength （N） of the 4 groups were 224.450 ± 18. 305 （ vs immediate, P 〈 0.05 ）, 212. 150 ± 10. 063 （ vs immediate, P〉0.05） , 176. 625 ± 30. 946 （ vs immediate, P〈0.05 ） and 107. 350 ± 22. 878 （ vs immediate, P 〈 0.05 ） respectively. SEM observation indicated that a more intense bonding interface was achieved in FUI and FUC groups, while a looser one appeared in the other 2 groups. CONCLUSION： Different cements have different effects on the bonding properties of glass fiber posts. Cyclic loading may increase the bonding durability of FUI or FUC with glass fiber posts.
出处
《牙体牙髓牙周病学杂志》
CAS
北大核心
2013年第12期783-787,共5页
Chinese Journal of Conservative Dentistry
基金
国家自然科学基金资助项目(81130078
81170985)
陕西省科技攻关项目(2011K12-04-03)
关键词
纤维桩
根管牙本质
拉出实验
循环加载
fiber post
root eanal dentin
pull out test
eyelie loading
