喷砂对不同树脂与纯钛粘结抗剪强度及粘结耐久力的影响

目的探讨喷砂处理对不同树脂与纯钛粘结抗剪强度及粘结耐久力的影响。方法用牙科铸钛的方法制作φ5 mm×5 mm及φ4 mm×2 mm的圆柱形钛段各96个,两种规格的钛段配对(共96对)。分成实验组和对照组。实验组钛粘接表面用50μm Al2O3喷砂,对照组钛表面不做处理。分别用Super-Bond C&B(SB)、Panavia F(PF)和Rely X Unicem(RU)按生产厂商提供的要求将大、小钛段成对粘接。分为SB未喷砂、SB喷砂、PF未喷砂、PF喷砂、RU未喷砂、RU喷砂6组(每组16对)。将以上每组中的一半样品(每组8对)置于37℃水浴箱内24 h,,另一半样品水储24 h后再进行5 000次冷热循环。将样品固定于MTS测试机上进行剪切强度的测试,计算粘结抗剪强度值。不同粘结剂组的粘结抗剪强度采用考虑交互作用的两因素方差分析进行统计学分析。结果冷热循环前,RU未喷砂组的粘接抗剪强度最低,SB喷砂组粘接抗剪强度最高,为(28.03±8.40)MPa,5 000次冷热循环后,PF喷砂组粘接抗剪强度最高,为(27.12±8.68)MPa,RU未喷砂组最低。冷热循环前,SB喷砂组和SB未喷砂组,RU喷砂组和RU未喷砂组的粘接抗剪强度值差异有统计学意义(P<0.05)。5 000次冷热循环后,RU喷砂组和RU未喷砂组的粘接抗剪强度值差异有统计学意义(P<0.05)。SB未喷砂组、SB喷砂组5 000次冷热循环前、后的粘接抗剪强度值差异有统计学意义(P<0.05)。其余各组5 000次冷热循环前、后的粘接抗剪强度值差异没有统计学意义(P>0.05)。结论喷砂能显著提高铸造纯钛与SB、RU的粘接抗剪强度及粘结耐久力,但不是和所有树脂与纯钛的粘接抗剪强度及粘结耐久力成正相关关系。

Effect of sandblasting on the shear bond strength and durability of three resin cements bonded to titanium

Objective To evaluate the effect of sandblasting on the shear bond strength and durability of three resin cements bonded to titanium. Methods Titanium in two sizes (φ5 mm×5 mm, φ4 mm×2 mm) were fabricated with titanium casting technology for dentistry, each size consisted of 96 specimens, and the two sizes were paired up to 96 pairs. The paired specimens were divided into the experiment group and the control group. The experiment group was sandblasted with 50 μm Al2 O3 particle,the control group was untreated. The paired titanium specimens were bonded by Super-Bond C&B ( SB) , Panavia F ( PF) and Rely X Unicem ( RU) , ac-cording to manufacturer’ s recommendations. The specimens were divided into 6 groups ( SB sandblasted, SB un-sandblasted, PF sand-blasted, PF un-sandblasted, RU sandblasted, RU un-sandblasted) , each of which consisted of 16 pairs of specimens. 8 pairs of each group were immersed in water bath at 37 ℃ for 24 hours, the other 8 pairs were treated with 5 000 cycles of thermocycling after being immersed in water at 37℃ for 24 hours. The shear bond strength was evaluated by the MTS testing machine. The values of each group were compared by two- factor ANOVA with interaction analysis. Results Before thermocycling, the shear bond strength of RU un-sandblasted group was the lowest, and the highest results were obtained in SB sandblasted group (28. 03±8. 40) MPa. After thermocy-cling, the highest strengths were obtained in PF sandblasted group (27. 12±8. 68) MPa, and the lowest results were obtained in RU un-sandblasted group. Before thermocycling, the shear bond strengths of SB sandblasted and SB un-sandblasted groups were statistical-ly different (P<0. 05), which was also true for RU sandblasted and RU un-sandblasted groups. After thermocycling, the results of RU sandblasted and RU un-sandblasted were still different (P<0. 05). Thermocycling statistically affected the shear bond strengths in SB sandblasted and SB un-sandblasted groups (P<0. 05). Other results were not statistically different (P>0. 05). Conclusion Sand-blasting can significantly increase the shear bond strength and durability of SB and RU bonded to titanium, but it isn’ t positively corre-lated with the shear bond strength and durability of all resin cements bonded to titanium.