KMID : 1023820140060030165
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The Journal of Advanced Prosthodontics 2014 Volume.6 No. 3 p.165 ~ p.170
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The effect of a desensitizer and CO2 laser irradiation on bond performance between eroded dentin and resin composite
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Meng Ding
Shin Sang-Wan Kim Min-Soo Ryu Jae-Jun Lee Jeong-Yol
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Abstract
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PURPOSE : This study was aimed to evaluate effect of the desensitizing pretreatments on the micro-tensile bond strengths (¥ìTBS) to eroded dentin and sound dentin.
MATERIALS AND METHODS : Forty-two extracted molars were prepared to form a flat dentin surface, and then they were divided into two groups. Group I was stored in distilled water while group II was subjected to a pH cycling. Each group was then subdivided into three subgroups according to desensitizing pretreatment used: a) pretreatment with desensitizer (Gluma); b) pretreatment with CO2 Laser (Ultra Dream Pluse); c) without any pretreatment. All prepared surfaces were bonded with Single Bond 2 and built up with resin composite (Filtek Z250). The micro-tensile bond test was performed. Fracture modes were evaluated by stereomicroscopy. Pretreated surfaces and bonded interfaces were characterized by scanning electron microscope (SEM). The data obtained was analyzed by two-way ANOVA (¥á=0.05).
RESULTS : For both sound and eroded dentin, samples treated with desensitizer showed the greatest ¥ìTBS, followed by samples without any treatment. And samples treated with CO2 laser showed the lowest ¥ìTBS. SEM study indicated that teeth with eroded dentin appeared prone to debonding, as demonstrated by existence of large gaps between adhesive layers and dentin.
CONCLUSION : Pretreatment with Gluma increased the ¥ìTBS of Single Bond 2 for eroded and sound teeth. CO2 laser irradiation weakened bond performance for sound teeth but had no effect on eroded teeth.
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KEYWORD
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Tooth erosion, Adhesives, Tensile strength, Lasers, Gluma dentin desensitizer
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