预处理工艺对SLM成型CoCr合金牙冠牙桥金瓷结合机制及性能的影响

The Effect of Pretreatment Process on the Metal-Porcelain Bonding Mechanism and Properties of CoCr alloy Dental Crown and Bridge Manufactured by SLM

摘要:

为了探究打磨喷砂预处理SLM成型CoCr合金基底对修复体的金瓷结合的影响机制，进而为SLM成型具有良好力学性能的CoCr合金牙冠牙桥修复体提供参考。采用SLM优化工艺参数成型3组CoCr合金基底试样，分别进行不同的打磨、喷砂预处理以相互对照，之后以相同参数进行烤瓷烧结。采用三点弯曲试验、粗糙度测试、SEM及EDS等测试方法分析不同对照组试样；测试结果表明，经过打磨和喷砂预处理的a组试样的金瓷结合强度达到36.79±0.49MPa，明显高于不打磨而保留SLM成型特征表面b组试样，以及打磨处理而不喷砂的c组试样，三组试样的平均金瓷结合强度均高于ISO9693：1999标准规定的最小值25MPa。a、c组的金瓷结合效果优于b组，3组试样的金瓷结合界面均发生元素扩散，分析还发现3组金瓷剥落面的残留物及其剥落面元素分布有显著差异；最终结论为：打磨、喷砂组合预处理获得的一定粗糙度的基底表面可保证金瓷间强大的化学结合以及可观的机械结合，可以显著提高SLM成型金瓷修复体的性能。

Abstract:

In order to investigate the influential mechanism of grinding and sand blasting pretreatment of CoCr alloy manufactured by SLM (selective laser melting) process on the metal-porcelain bonding of the restorations, and then provide references for SLM manufacturing CoCr alloy dental crown and bridge restorations with good mechanical properties. Three groups of CoCr alloy substrates were manufactured by SLM process with optimal parameters. The samples were subjected to different grinding and sand blasting pretreatment respectively, and the porcelain sintering was carried out with the same parameters. The samples of different groups were analyzed by three-point bending test, roughness test, SEM and EDS. Results show that the metal-porcelain bonding strength of samples in group a grinded and sand blasted is 36.79 ± 0.49MPa, which is obviously higher than that of group b with non-grinding but sand blasting and group c with only grinding. The average metal-porcelain bonding strength of the three group samples was higher than the ISO9693: 1999 standard minimum 25MPa.The metal-porcelain bonding effect of group a and c is better than that of group b, and the element diffusion on metal-porcelain interface was observed in all three groups. The results also showed that there were significant differences among the three groups on residues and element distribution of metal-porcelain peeling surface. The final conclusion is that the surface roughness obtained by the pretreatment of sand blasting and grinding can ensure the strong chemical combination of metal and porcelain and considerable mechanical properties combination, which can improve the performance of metal-porcelain restorations manufactured by SLM.