Effect of Surface Treatments on Shear Bond Strength of Immediate Resin Composite Repair
Main Article Content
Abstract
Immediate repair of non-aged, polished resin composite is a challenging task in restorative dentistry as the bond strength between 2 layers of resin composite fillings might be compromised. The aim of this study was to compare the effect of different surface treatments on the shear bond strength of polished resin composite immediate repairs. Two hundred and fifty resin composite specimens were prepared in plaster stone molds. All prepared specimens were divided into 10 groups (N=25) including Group 1-No surface treatment (positive control), Group 2-Polishing with Sof-LexTM discs without additional surface treatment (negative control). Group 3 to 10 were polished with Sof-LexTM discs, then treated with distinct surface treatment protocols as
following: Group 3-Applying AdperTM Single Bond 2 alone (Si), Group 4-Roughening using a diamond bur (DB), Group 5-Sandblasting with Aluminum oxide particles (SB), Group 6-Applying 35% phosphoric acid (PA). Similar treatment protocols were applied for specimens in Group 7 to 10 with one additional step in which silane coupling agent was applied prior to the application of AdperTM Single Bond 2 (SiS, DBS, SBS, PAS). Prepared cylindrical-shaped resin composite specimens were then bonded on all prepared resin composite specimens, subsequently stored in an incubator under humidity control for 24 hours. Shear bond strength of each specimen was determined using a universal testing machine. Our results revealed that Si, PA, DB, and SB group showed significantly higher shear bond strength when compared to negative control (P<0.05). SB group demonstrated the maximum bond strength (26.67 MPa), followed by DB (26.10 MPa), PA (24.55 MPa), and Si (17.42 MPa). In addition, the use of methacryloxydecyl dihydrogen phosphate (MDP) – containing silane coupling agent significantly increased shear bond strength in SiS (P<0.001) as well as PAS group (P=0.042). It was concluded that surface treatment on polished resin composite restorations significantly improved the shear bond strength of resin composite repairs.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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