热酸蚀刻对氧化锆陶瓷初期粘结强度的影响

目的:考察两种酸液在加热条件下蚀刻处理对氧化锆陶瓷与树脂初期粘结强度的影响?方法:制作32个氧化锆陶瓷片,分为4组分别进行表面处理?A组:喷砂;B组:喷砂+H2SO4和(NH4)2SO4混合液煮沸下处理30 min + Clearfil Ceramic Primer涂底剂;C组:喷砂+HF和HNO3混合液煮沸下处理30 min + Clearfil Ceramic Primer涂底剂;D组:喷砂 + Clearfil Ceramic Primer涂底剂?制备复合树脂柱,以树脂水门汀将其粘固于处理过的氧化锆陶瓷表面?粘结试件水储24 h后,测试剪切粘结强度?扫描电镜观察各处理组的陶瓷表面?结果:A组的粘结强度值最低,D组其次,B?C组的粘结强度值较高且无显著性差异?扫描电镜观察发现两种酸蚀刻后形成了与喷砂不同的粗化表面形态?结论:两种酸液在加热条件下能够对氧化锆陶瓷进行蚀刻粗化,同时可对其初期粘结强度起到增强作用?

Effect of hot acid etching on initial bond strength of zirconia to resin

Objective:To investigate the initial bond strength of zirconia etched with two kinds of hot acid mixtures to resin. Methods: Total 32 zirconia ceramic blocks were manufactured and divided into 4 groups received different surface treatments. Group A, sandblasting; group B, sandblasting combined with hot H2SO4 and(NH4)2SO4 mixture etching 30 min, and applying Clearfil Ceramic Primer; group C, sandblasting combined with HF and HNO3 mixture etching 30 min, and applying Clearfil Ceramic Primer; group D, sandblasting and applying Clearfil Ceramic Primer. Thirty-two composite resin columns were prepared and cemented on the pre-treated zirconia blocks with composite resin cement. Shear bond strength(SBS) test were executed after water storage for 24 hours. The zirconia surfaces treated with different treatments were observed with a scanning electron microscope. Results: The SBS values were lowest in group A, and higher in group B and group C, among 4 groups, and had no significant difference between group B and group C. There were differences in surface morphology between the hot acid etched groups and the sandblasted group by SEM observation. Conclusion: Both the two acid mixtures are able to etch to zirconia surface, and the initial SBS of zirconia to resin can be improved thereby.