Pipop Saikaew1, Jiale Fu2, A F M Almas Chowdhury3, Ricardo M Carvalho4, Hidehiko Sano3. 1. Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, No. 6, Yothi Road, Ratchathewi District, Bangkok, 10400, Thailand. pipop.sai@mahidol.ac.th. 2. Department of Dental Materials, The Second Department of Prosthodontics, School and Hospital of Stomatology, China Medical University, No. 117 Nanjing Street, Heping District, Shenyang, 110002, Liaoning Province, China. 3. Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo, 060-8586, Japan. 4. Department of Oral Biological and Medical Sciences, Division of Biomaterials, University of British Columbia, Faculty of Dentistry, 2199 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada.
Abstract
OBJECTIVES: To evaluate the effects of air-blowing time and storage time on microtensile bond strength (μTBS) of universal adhesives to dentin. MATERIALS AND METHODS: Ninety flat dentin surfaces from extracted human third molars were bonded with three universal adhesives (Clearfil Universal Bond-CU; G-Premio Bond-GP; Scotchbond Universal Adhesives-SB). Bonded dentin surfaces were air-dried for 5 s, 15 s, or 30 s followed by resin composite built-up. Resin-dentin beams were tested with μTBS test after different storage time in distilled water (24 h and 1 year). Data were analyzed by three-way ANOVA and Duncan test at (α = 0.05). Failure mode and resin-dentin interfaces were observed using a scanning electron microscope (SEM). Specific features of fractured beams after μTBS were further observed using SEM at high magnification. RESULTS: Extension of air-blowing time from 5 s to 30 s increased the 24 h μTBS of CU only. Bond strength of all adhesives significantly decreased after 1-year storage except for CU at 5 s and 30 s of air-blowing time. One-year μTBS were significantly higher when air-blowing times were extended to 15 s for SB and 30 s for CU. Air-blowing time had no influence on GP. CONCLUSION: The effect of air-blowing time and storage time on resin-dentin bond was material-dependent. CLINICAL RELEVANCE: Extended air-blowing time increased the bond strength and bond durability of CU. Extension of air-blowing time to 15 s and 30 s improve the long-term bond strength of SB and CU, respectively.
OBJECTIVES: To evaluate the effects of air-blowing time and storage time on microtensile bond strength (μTBS) of universal adhesives to dentin. MATERIALS AND METHODS: Ninety flat dentin surfaces from extracted human third molars were bonded with three universal adhesives (Clearfil Universal Bond-CU; G-Premio Bond-GP; Scotchbond Universal Adhesives-SB). Bonded dentin surfaces were air-dried for 5 s, 15 s, or 30 s followed by resin composite built-up. Resin-dentin beams were tested with μTBS test after different storage time in distilled water (24 h and 1 year). Data were analyzed by three-way ANOVA and Duncan test at (α = 0.05). Failure mode and resin-dentin interfaces were observed using a scanning electron microscope (SEM). Specific features of fractured beams after μTBS were further observed using SEM at high magnification. RESULTS: Extension of air-blowing time from 5 s to 30 s increased the 24 h μTBS of CU only. Bond strength of all adhesives significantly decreased after 1-year storage except for CU at 5 s and 30 s of air-blowing time. One-year μTBS were significantly higher when air-blowing times were extended to 15 s for SB and 30 s for CU. Air-blowing time had no influence on GP. CONCLUSION: The effect of air-blowing time and storage time on resin-dentin bond was material-dependent. CLINICAL RELEVANCE: Extended air-blowing time increased the bond strength and bond durability of CU. Extension of air-blowing time to 15 s and 30 s improve the long-term bond strength of SB and CU, respectively.
Entities:
Keywords:
Air-blowing time; Long-term bond strength; Microtensile bond strength; SEM; Universal adhesives
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