The repair bond strength to resin matrix in cured resin composites after water aging

• Main Authors: Dhaifallah Alqarni, Masatoshi Nakajima, Keiichi Hosaka, Kurumi Ide, Daiki Nagano, Takehiro Wada, Masaomi Ikeda, Teerapong Mamanee, Ornnicha Thanatvarakorn, Taweesak Prasansuttiporn, Richard Foxton, Junji Tagami
• Format: Journal
• Published: 2019
• Subjects: Dentistry; Materials Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85064001519&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/65563
• Institution: Chiang Mai University

© 2019, Japanese Society for Dental Materials and Devices. All rights reserved. The repair microshear bond strengths (μSBSs) to resin matrices in 4 different cured-composites after water storage (0, 60 s, 1 week, 1 month) were evaluated. Three different adhesive application methods to the cured-composites were performed; (1) none, (2) onestep self-etch adhesive application, and (3) one-step self-etch adhesive application with a silane coupling agent. Degree of conversion (DC) of the composite discs was determined using ATR/FT-IR with a time-based spectrum analysis. Initially, the amount of unreacted resin monomers in the repaired cured-composite contributed to the bonding performance of newly-filled uncured-composite to resin matrix of the cured-composite. Adhesive application could not improve their repair μSBS. After 1-month of water-storage, the repair μSBS was dependent on material, which either reduced or did not and was not influenced by their amount of un-reacted resin monomers. When repairing aged composite resin, the appropriate adhesive application procedures were different among resin composites.