摘要
目的评价Er,Cr∶YSGG激光备洞对硬化牙本质微拉伸粘接强度的影响,并比较其对两种不同充填材料粘接强度的影响。方法 40颗带有楔状缺损的老年人前磨牙,表面有典型硬化牙本质,随机分成实验组和对照组。实验组用Er,Cr∶YSGG激光备洞,对照组用牙科高速涡轮手机备洞,实验组和对照组再各分两个亚组,均分别用复合树脂和玻璃离子水门汀充填。所有样本在37℃蒸馏水中放置24 h,然后制备成厚度约1 mm的哑铃型片状试件,在Instron 5848微力试验机上测定微拉伸粘接强度,在扫描电镜下观察牙本质断面的表面形态。结果实验组中复合树脂组的微拉伸粘接强度为(35.24 7.05)Mpa,玻璃离子水门汀组微粒伸粘接强度(17.71 5.74)Mpa,对照组中复合树脂组微粒伸粘接强度(27.56 4.79)Mpa,玻璃离子水门汀组微粒伸粘接强度(11.47 5.12)Mpa。实验组和对照组的微拉伸粘接强度比较差异有显著意义(P<0.05),两组复合树脂组和玻璃离子水门汀组的微拉伸粘接强度比较;差异有显著意义(P<0.05)。结论 Er,Cr∶YSGG激光备洞老年人非龋性硬化牙本质后的粘接强度高于高速涡轮手机预备者,复合树脂的粘接强度优于玻璃离子水门汀。
Objective To evaluate the influence of Er,Cr ∶YSGG laser on the microtensile bond strength of the non-carious sclerotic dentin of the elderly,and compare the influence of two different filling materials on the bond strength. Methods Forty elderly premolars having wedge-shaped defects and typical sclerotic dentin on the surface were randomly divided into the experimental group and control group.The premolars in the experimental group were processed with Er,Cr ∶YSGG laser,and those in the control group with high-speed dental turbine handpiece.Each group was further divided into two subgroups,having composite resin or glass ionomer cement as filling agents.The teeth were stored in distilled water for 24 hours at 37℃ and then cut into dumbbell-shaped specimens approximating 1 mm in thickness.The microtensile bond strength was determined with Instron 5 848 Micro Tester.Then the morphological change of dentin surface was observed with SEM. Results n the experimental group,the microtensile bond strength stood at（35.24 7.05） Mpa and（17.71 5.74） Mpa respectively for the composite resin subgroup and glass ionomer cement subgroup.In the control group,it was（27.56 4.79） Mpa and（11.47 5.12） Mpa respectively for the composite resin subgroup and glass ionomer cement subgroup.The difference of microtensile bond strength between the experimental group and control group was statistically significant（P0.05）.Within either group,the difference of microtensile bond strength between the composite resin subgroup and glass ionomer cement subgroup was statistically significant（P0.05）. Conclusions The elderly non-carious sclerotic dentin processed with Er,Cr ∶YSGG laser has higher bonding strength than that with high-speed dental turbine handpiece.Composite resin is greater than glass ionomer in bonding strength.
出处
《中国激光医学杂志》
CAS
CSCD
2012年第2期74-77,132,共5页
Chinese Journal of Laser Medicine & Surgery
基金
辽宁省医学高峰建设工程重点科研项目(200909)
