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

Dhaifallah Alqarni, Masatoshi Nakajima, Keiichi Hosaka, Kurumi Ide, Daiki Nagano, Takehiro Wada, Masaomi Ikeda, Teerapong Mamanee, Ornnicha Thanatvarakorn, Taweesak Prasansuttiporn, Richard Foxton, Junji Tagami

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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 un-reacted 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.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalDental Materials Journal
Issue number2
Publication statusPublished - 31 Mar 2019


  • Adhesive application
  • Degree of conversion
  • Repair bond strength
  • Resin matrix
  • Water aging


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