Er:YAG激光和酸蚀作用于牙釉质表面后剪切强度的比较研究

目的 探讨Er:YAG激光照射对牙釉质表面的蚀刻效果,并与酸蚀效果进行比较研究.方法 2010年4-7月在山西医科大学选取40颗完整的人离体双尖牙,随机分为4组(每组各10颗牙),即酸蚀组(35%的磷酸),Er:YAG激光组(5Hz,100 mJ,0.5W),酸蚀加Er:YAG激光组,Er:YAG激光加酸蚀组.分别在牙...

Comparative study on shear strength after Er:YAG laser and acid etching effect on enamel surface

Objective To study the etching effect of enamel surface irradiated by Er：YAG laser,and compare it with the effect of acid etching.Methods A total of 40 complete isolated human premolars were chosen and were randomly divided into four groups of 10 teeth each at Shanxi Medical University from April 2010 to July 2010.Acid group（35% phosphoric acid）,Er：YAG laser group（5Hz,100mJ,0.5W）,acid etching＋ Er：YAG laser group,Er：YAG laser＋acid etching group.Respectively conduct the etching treatment on enamel surface,light-cured composite resin bonding and the shear strength test.Results Acid＋Er：YAG laser group got the highest shear strength value（16.0±4.2）MPa,compared with other groups the difference was statistically significant（P 0.05）;Er：YAG laser＋acid group got the lowest shear strength value[（7.1±2.9）MPa],compared with other groups the difference was statistically significant（P 0.05）;the value of the shear strength of acid group[（11.3±5.7）MPa] and the Er：YAG laser group[（10.3±4.6）MPa] were in middle,which had similar results,and the two had no statistically significant difference by comparison（P 0.05）.Conclusion Er：YAG laser etching can achieve similar shear strength to acid;acid etching with Er：YAG laser irradiation can improve the shear strength to some extent.