摘要目的 探讨硅涂层溶胶-凝胶法制备过程中碳酸氢钠(NaHCO3)促凝对氧化锆陶瓷粘接强度的影响,为溶胶-凝胶法制备硅涂层的临床应用提供实验依据.方法 对比掺杂质量分数为1％、3％、5％、7％、10％的NaHCO3后氧化硅溶胶的胶凝时间,选取胶凝时间最短者进行后续实验.制作5组氧化锆-复合树脂粘接试件,A组:氧化铝喷砂；B组:氧化铝喷砂+摩擦化学法制备硅涂层+硅烷化；C组:氧化铝喷砂+溶胶-凝胶法制备硅涂层+硅烷化；D组:氧化铝喷砂+溶胶-凝胶法制备硅涂层过程中使用NaHCO3促凝+硅烷化；E组:氧化铝喷砂+氧化锆涂底剂处理.测试5组试件抗剪切强度,即粘接强度.结果 掺杂10％的NaHCO3后氧化硅溶胶的胶凝时间最短.B、C、D、E组粘接强度[分别为(10.24±2.78)、(7.36±1.59)、(9.79±2.07)、(8.39 ±0.49) MPa]均比A组[(4.12±0.52) MPa]显著提高,C和D组间差异无统计学意义(P＞0.01).结论 掺杂NaHCO3后氧化硅溶胶的胶凝时间缩短,涂层制备过程中使用NaHCO3促凝不影响氧化锆陶瓷的粘接强度.

abstractsObjective To evaluate the effects of NaHCO3 on gelation of silica sols and shear bond strength of silica coated zirconia via collosol-gelatin (Sol-Gel) process.Methods The gelation time of silica sols after being mixed with 1％,3％,5％,7％,10％ concentrations of NaHCO3 was recorded.The one got the shortest gelation time was used for the following tests.Zirconia blocks were prepared and divided into five experimental groups according to surface conditioning methods:group A,alumina sandblasting; group B,sandblasting + tribochemical silica coating + silane; group C,sandblasting + silica coating via Sol-Gel process + silane; group D,sandblasting + silica coating via Sol-Gel process (NaHCO3 was used) +silane; group E,sandblasting + zirconia primer.A composite resin column was bonded on the treated zirconia surface with Bis-GMA based composite resin cement.All specimens were subjected to shear bond strength (SBS) tests.Results The shortest gelation time of silica sols were found when silica sols was mixed with 10％ NaHCO3(.) Group A showed the lowest SBS values of (4.12 ± 0.52) MPa,which was significant different from SBS of group B [(10.24 ± 2.78) MPa],C [(7.36 ± 1.59) MPa],D [(9.79 ±2.07) MPa],D[(8.39 ±0.49) MPa],and no statistical difference was found between group C and D.Conclusions The silica coating via Sol-Gel process can significantly improve the bond strength of zirconia,and NaHCO3 would not exert influences to bonding.