Abstract
To evaluate the clinical effect of different kinds of laser on 60 molars with abrasion. Thirty patients with 60 abrasive molars were selected according to the inclusion criteria. Molars and premolars were divided into 2 groups randomly. Teeth in the experimental group were treated with Er,Cr:YSGG laser combined with AdperTM Easy One, while teeth in the control group were treated with Nd:YAG laser combined with AdperTM Easy One, composite resin Z350 was selected to restore the defect. The modified USPHS criteria was used to evaluate the treatment effects at recall periods.The data were analyzed using SPSS 13.0 software package. On retention, the B level rate of the experimental group was significantly lower than that of the control group(P<0.05) 12 months later. For success rate at 18 months，the difference between the experimental group and the control group was significant（P<0.05）. At the same time, sensitivity of tooth and overall response in the two groups had no significant difference (P>0.05). Although the overall response between the two groups had no significant difference,Er,Cr:YSGG laser shows better effect of retention, which is the preferred option for treatment of abrasive molars.
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