脱敏及脱敏后酸蚀对牙本质与氧化锆粘结强度的影响

Effect of acid etching and desensitization on the bonding strength of dentin and zirconia

摘要:

目的：比较2种脱敏方式及脱敏后酸蚀对氧化锆与牙本质粘结强度的影响，为其临床应用提供实验依据。方法：收集无龋完整的第三磨牙50颗，截去冠端，暴露牙本质，将其随机分成对照组A、实验组B、B1和C、C1（n=10），均浸入1∶3稀释的胎牛血清溶液备用。1 d后取出，A组无处理，B、B1组涂布Gluma脱敏剂，C、C1组用水激光处理。粘结前B1、C1组磷酸酸蚀15 s，其余各组不处理，各标本牙本质粘结底面同等大小氧化锆，并测定其剪切强度，结果采用 SPSS 17.0 分析。结果：粘结强度：A组（9.626±0.318） MPa，B组（12.577±0.374） MPa，B1组（15.650±0.344） MPa，C组（9.530±0.391） MPa，C1组（12.740±0.310） MPa。除A组与C组比较（P >0.05），B组与C1组比较（P >0.05），差异没有统计学意义，其余组别两两比较差异皆有统计学意义（P<0.05）。结论：Gluma脱敏剂可以增强Rely XTMUnicem与牙本质的粘结强度，水激光或Gluma脱敏的牙本质在通过适当磷酸酸蚀皆可增强与Rely XTMUnicem的粘结强度。

Abstract:

Objective：To evaluate the effects of acid etching and two kinds desensitizing agents on zirconia and dentin in order to pro－vide references for clinical treatment. Methods：Fifty molars（the third molar） without caries were collected and the crowns of the mo－lars were removed to expose the dentin. All samples were divided into control group A and experimental groups B，B1，C，C1（n=10）. All 50 molars were immersed into 1∶3 fetal bovine serum solution and were taken out 1 d after. No treatment was made in group A；molars in groups B and B1 were coated by Gluma desensitizer；molars of groups C，and C1 were treated by water. Before bonding，mo－lars in groups B1 and C1 were treated by phosphoric acid for 15 seconds while no treatment was made in other groups. The dentin of specimens were bonded with zirconia with the same size at the bottom and the shear strength was determined. The results were ana－lyzed by software of SPSS 17.0. Results：The bonding strength：A group（9.626±0.318） MPa，B group（12.577±0.374） MPa，B1 group（15.650±0.344） MPa，C group（9.530±0.391） MPa，C1 group（12.740±0.310） MPa. There were statistical differences between groups（P<0.05） except comparison between group A and group C（P >0.05） and between group B and group C1（P >0.05）. Conclusion：Gluma desensitizer can enhance the bonding strength of Rely XTM Unicem on dentin. Proper phosphoric acid etching of dentin treat－ed by water laser or Gluma desensitization can enhance the bonding strength of Rely XTM Unicem on dentin.