Nd:YAG激光轰击处理纯钛表面对钛-瓷结合强度影响的实验研究

目的: 探讨Nd:YAG激光处理对纯钛表面形貌、理化性能以及钛-瓷结合强度的影响。方法: 将30个纯钛试片表面用碳化硅砂纸打磨后得到规格为25 mm×3 mm×0.5 mm的标准试件,随机均分为3组,A 组为喷砂组,B组为激光处理15 s组,C组为激光处理30 s组,测量各组的表面粗糙度值和金属-蒸馏水表面接触角。钛表面烤瓷,测试钛-瓷间的三点弯曲结合强度并统计学分析,用扫描电镜观察纯钛处理后的表面形貌和钛-瓷分离面的表面形貌以及EDS分析。结果: 3组钛-瓷结合强度在统计学上有显著差异(P<0.001),B组钛-瓷结合强度高于A组(P<0.05),且小于C组(P<0.05)。结论: 钛表面Nd:YAG激光处理后可有效提高钛-瓷的结合强度。

Study on Nd:YAG Laser Etching on the Bonding Strength of Titanium to Porcelain.

Objective: To investigate the effects of Nd:YAG laser treatment on the microstructure and bonding strength of titanium to porcelain. Methods: Thirty non-cast titanium strips were rubbed by silicon carbide sandpaper under running water, and then divided into three groups (Group A to C, 10 strips per group) randomly. Group A was sandblasted. Group B was Nd:YAG laser irradiated at 20A for 15s. Group C was Nd:YAG laser irradiated at 20A for 30s. Microstructural and chemical analyses were performed by means of SEM and EDS. After surface treatment, low-fusing porcelain was applied on the titanium specimens according to the manufacturer’s instructions. Bonding strength was measured by a three-point bending tester according to ISO9693. SEM and EDS analyses were also performed for one specimen of each group after the shear bond strength test to evaluate the nature of the fracture surface. Results: There was difference in the surface morphology and the phase components of three groups. Group C produced the highest bond strength among three groups (P<0.001). The bond strength of group B was higher than that of group A (P<0.05), which was also significantly lower than that of group C (P<0.05). Bonding strength of group B and group C were higher than the minimum requirement of ISO 9693. Conclusion: Laser treatment may be an alternative method to sandblasting for enhancing the bonding strength of low-fusing porcelain to titanium.