Effect of Etching Time on Microtensile Bond Strength to Amalgam-Discolored Dentin
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Abstract
The aim of this study was to examine the effect of etching time on microtensile bond strength (µTBS) to amalgam-discolored dentin. Twenty extracted restoration-free human molars (normal dentin group) and twenty extracted amalgam-filled human molars (discolored dentin group) were prepared. After removal of amalgam in discolored dentin group, the teeth in both groups were cut horizontally to expose flat mid-dentin surfaces. Each specimen was sectioned into 2 subgroups according to 37% phosphoric acid etching time of 15 and 60 s. Subsequently, the specimens were bonded with 3-step etch and rinse adhesive (OptiBond™ FL, Kerr, CA, USA) and restored with resin composite. The bonded specimens were subjected to microtensile bond strength (µTBS) test. Data were statistically analyzed by two-way ANOVA and Tukey’s test at significance level of 95%. The fractured surfaces of all specimens were examined using stereomicroscope. The results exhibited that µTBS of 15-s etching time on amalgam-discolored dentin group was significantly lower than normal dentin group. Increasing etching time to 60 s on amalgam-discolored dentin could significantly increase µTBS (p<0.05). From the result of this study, prolonged etching time to 60 s could improve µTBS of amalgam-discolored dentin with etch-and-rinse dental adhesive system.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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