EFFECT OF ER: YAG LASER ON THE BOND STRENGTH OF NON-CARIOUS SCLEROTIC DENTIN IN ADULT
Lihua Hong, Jiafeng Wang, Li Liu, Shan Jiao and Yu Wang*
ABSTRACT
Objectives: To evaluate the effect of Er:YAG laser preparation on the bonding properties be-tween composite resin and the the sclerotic dentin of elderly subjects． Methods: 40 extracted premolars with cervical wedge-shaped defect and sclerotic dentin on the surface from 18 -50 year-adult people were randomly divided into 2 groups (n = 20). In the experimental group Er:YAG laser was used for cavity preparation, in the control group regular burs with high speed turbines was used for cavity preparation. The cavies of all teeth were filled with composite resin Filtek Z350. 15 samples in each group were cut into dumbbell－shaped specimens with a bonding area of 1 mm2 The micro-tensile bond strength (MBS) was tested on Instron 5848 Micro Tester. Each tooth of the remaining 5 samples in each groupe were divided into two parts along buccolingual directions parallel to the long axis of the tooth. The bonding interface was observed by SEM ResultsThe MBS (MPa) of experimental and control groups was (35.24 ± 7.05) MPa and (27.56 ± 4.79) MPa respectively (P< 0.05). SEM observation showed that hybrid layer between sclerotic dentin and composite resin was thinner in experimental groupresin tags and crystallizing column within dentinal tubules connected together tightly. Conclusions: Er:YAG laser preparation can improve the bond strength between adult non-carious sclerotic dentin and composite resin.
Keywords: Er: YAG Laser; micro-tensile bond strengths; adult; non-caries sclerotic dentin.
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