【作者】 王胜华； 汪饶饶； 王小平； 张晓辉；

【Author】 WANG Sheng-hua, WANG Rao-rao,WANG Xiao-ping,ZHANG Xiao-hui.(School of Stomatology, Tongji University.Shanghai 200072;The Affiliated 10th People’s Hospital, Tongji University. Shanghai 200072;Company of 3M China Limited.Shanghai 200233,China)

【机构】 同济大学口腔医学院； 同济大学附属第十人民医院； 3M中国有限公司；

【摘要】 目的:评价冷热循环对纳米填料树脂FiltekTM Supreme(FS)剪切强度的影响,为临床选择树脂材料提供参考依据。方法: 选用3M公司产F2000 Compomer(FT)、FiltekTM Z250(ZT)和FiltekTM Supreme(FS),采用该公司同种粘接剂(Adper Prompt)与人类离体第三磨牙近中面牙本质粘接,试件(每组10个,共6组)在37℃生理盐水中24h经2000次冷热循环(5℃和55℃)后,以 1mm／min的速度做剪切强度测试并比较冷热循环前后的剪切强度。结果:冷热循环前3种材料剪切粘接强度差异无显著性(P> 0．05),冷热循环后3种材料剪切强度大小差异有显著性(P<0．05),冷热循环测试前后,FS与其他各组的剪切强度差异有显著性,FT和ZT组分别与其他各组剪切强度差异无显著性。结论:冷热循环对FiltekTM Supreme的剪切强度有影响。更多还原

【Abstract】 PURPOSE: To evaluate the influence of thermal cycling on shear bond strength of the nanofill composite (Filtek?Supreme). METHODS: Three dental restorative materials F2000 Compomer (FT) ,FiltekTM Z250(ZT) and Filtek?Supreme (FS) were selected, bonded with the same self-etch adhesive systems (Adaper prompt), configured in blocks on the medial surface of human molars in vitro. according to manufacturer’s instructions.All specimens(six groups, ten specimens in each group) were conditioned at 37℃ for 24hrs. Ten specimens in each group were thermocycled at 2000 cycles (at 5℃ and 55℃) with a dwell time of 60s and bonds blocks were tested in shear at a rate of 1.0 mm/ min until failure. Data were collected and analyzed by one-way ANOVA and Student-Newman-Keuls rank test (alpha =0.05). RESULTS: Bond strengths among FT, ZT and FS,prior to thermocycling were not significantly different (P>0.05). After thermal cycling, the bond strengths of FT,ZT FS respectively was FT: 13.52MPa±4.59MPa,ZT: 15.32MPa±6.17MPa and FS: 7.88MPa±1.47MPa.The bond strength of nanofill composite significantly reduced after thermal cycling was performed, as compared with the other two groups (P<0.05). And significant differences were found in FS between prior to thermocycling and after thermocyeling. CONCLUSIONS: Thermal cycling had obvious negative effect on the bond strength of FS.更多还原