摘要
目的比较老年牙本质和青年牙本质与复合树脂间粘接强度的差异,评价Er,Cr:YSGG激光对牙本质与复合树脂间粘接强度的影响。方法于2012年2—3月在中国医科大学口腔医学院收集老年人(A组)和青年人(B组)离体牙标本各10颗,每组随机分为2个亚组,即A1、A2组和B1、B2组。A1、B1组采用Er,Cr:YSGG激光预备,A2、B2组采用传统涡轮手机预备,自酸蚀粘接剂结合Z350复合树脂充填,37℃水浴24h后,制备成沙漏状试件并进行微拉伸粘接强度测试。体式显微镜下观察并记录断裂模式。结果微拉伸粘接强度测试结果,青年牙本质组明显高于老年牙本质组,差异有统计学意义(P<0.05);激光预备组略高于手机预备组,差异无统计学意义(P>0.05)。各组断裂模式多为界面断裂,组间差异无统计学意义(P>0.05)。结论老年牙本质由于增龄性变化导致粘接强度降低;Er,Cr:YSGG激光预备对牙本质与复合树脂间粘接强度无不利影响,可作为传统涡轮手机的替代方法。
Objective To evaluate the influence of dentin age and Er, Cr：YSGG laser on the microtensile bond strength of a rensin cement to dentin. Methods Twenty extracted molars from subjects over 65 years old（Group A） and 20 - 44 years old （Group B） were selected and randomly divided into subgroups （Group A1, A2, B1, B2）. Then teeth in Group A1 and B1 were processed with Er, Cr：YSGG laser while teeth in Group A2 and B2 were processed with high-speed den- tal turbine handpiece, combined with self-etching adhesive and filled with composite resin （Z350）. All subjueets were saved in distilled water for 24 hours at 37% .Then they were cut into hourglass-shaped specimens and the mierotensile bond strength was evaluated. All specimens were examined under stero-microscope. Results There was significant dif- ference between aged dentin group and young dentin group （P 〈 0.05） but no difference between Er, Cr：YSGG laser group and turbine handpiece group （P 〉 0.05 ）.There was no significant difference of breakage modes among four groups （P 〉 0.05）.Conclusion This in vitro study showed that aging of dentin negatively affects the microtensile bond strength, while Er, Cr：YSGG laser irradiation does not negatively affect the bond strength of aged and young dentin.
出处
《中国实用口腔科杂志》
CAS
2012年第9期548-550,554,共4页
Chinese Journal of Practical Stomatology
基金
辽宁省医学高峰建设工程重点科研项目(200909)
