摘要
Abstract
Objective:The purpose of this study was to evaluate the effect of Er,Cr:YSGG laser-based etch on the bond strength of the metal brackets to enamel.Methods:Eighty human premolars extracted for orthodontic treatment were obtained to made into the specimens for shear bond test,and then randomly divided into 2 groups according to the different enamel surface pre-treatments that were etched by phosphoric acid(group A)and by Er,Cr:YSGG laser(group B).And then,both groups were randomly divided into 4 subgroups(n=10)on the basis of the different testing times,that were after the bond for 30 min(subgroup a),after the bond for 24 h(subgroup b),thermal-cycling for 5000 times(subgroup c),thermal-cycling for 10000 times(subgroup d),respectively.The shear bond strength test was used to evaluate the bond strength of the metal brackets to enamel,followed by the counts of the adhesive remnant index(ARI).Results:In the group A,the subgroup Ab was obtained the highest shear bond strength(P<0.05),so was the subgroup Bb in the group B(P<0.05).However,the shear bond strength of the subgroup Aa and Ba was the lowest in the group A and B,respectively.After the bond for 30 min,there was no significant difference between group A and B(P>0.05),while under the conditions of the other three testing periods,the shear bond strength of group B was significant higher than group A(P<0.05).For all of the four test time points,the ARI of the group A was not significant higher than the group B(P>0.05).Both of group A and B,the ARI were highest in subgroup a,that along with the increase of the aging time,the ARI of the subgroups became lower and lower.Conclusion:Compared with the phosphoric acid etching,Er,Cr:YSGG laser-based etch was more effective to the bond strength of metal brackets to enamel,especially for the short-term effects.关键词
Er,Cr:YSGG激光/酸蚀/抗剪切强度/粘接剂残留指数Key words
Er,Cr:YSGG laser/Etching/Shear bond strength/Acid remnant index分类
医药卫生
