预氧化对钛-瓷结合影响的实验研究

Effect of pre-oxidation on bonding strength of titanium to porcelain

目的探讨预氧化处理对2种钛/瓷系统结合强度及钛瓷结合界面的影响。方法对钛表面采用喷砂及喷砂加预氧化2种不同方法处理后,表面分别采用Duceratin(Degudent),Vita titankeramik(Vita)2种钛瓷进行烧结。根据ISO9693标准,对钛/瓷间的三点弯曲结合强度进行测试,并对钛/瓷结合界面进行SEM观察。结果预氧化组的钛/Duceratin瓷结合强度与未预氧化组相比在统计学上具有显著差异(P<0.05);预氧化组的钛/Vita瓷结合强度与未预氧化组相比在统计学上无显著差异(P>0.05)。预氧化组的钛/Duceratin瓷界面瓷与钛基体结合紧密,无明显裂隙;对照组的钛/Duceratin瓷界面间可见不连续的裂隙;预氧化钛/Vita瓷界面瓷与钛基体结合较紧密,只在局部区域存在少量的孔隙,但瓷内有大量气泡、孔隙存在。对照组钛/Vita瓷界面存在较连续的线状裂隙。结论钛表面预氧化可有效地提高钛/Duceratin瓷的结合强度,但对钛/Vita ti-tankeramik瓷的结合强度无显著影响。

Objective：To evaluate the effect of preoxidation on the bonding strength of titanium to porcelain. Method： 12 titanium plates （ 25 mm × 3 mm× 0.5 ram） were pre-oxidated according to usual preoxidation procedure and 12 without preoxidation were used as the controls. The samples（6 in each group） were then bonded with bonding porcelain, opaque porcelain,dentin porcelain and glaze of Duceratin（Degussa） or Vita titankeramik（Vita） respectively. The bonding strength of Ti/poreelain was evaluated using three-point bending test according to ISO 9693 1990 standard. The interface of Ti/poreelain bonding was observed by SEM. Results：Bonding strength（MPa） of Ti/Duceratin preoxided group and the corresponding control was 41. 910 ± 2. 778 and 33. 097 ±5. 297 （ P 〈 0.05 ）, that of Ti/Vita titankeramik preoxided group and corresponding control 19. 388 ± 0.588 and 20. 172 ± 0. 898 （ P 〉 0.05 ）, respectively. SEM observation showed inter-lock and tight bonding of Ti/poreelain in pre-oxidated interface, more cracks and gaps between Ti and porcelain in non-pre-oxidated interface. Conclusion： Pre-oxidation may improve bonding strength of Ti/ Duceratin system, while has no significant effect on bonding strength of Ti/Vita titankeramik system.