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Influence of methyl mercaptan on the repair bond strength of composites fabricated using self‐etch adhesives
Author(s) -
Yokokawa Miho,
Rikuta Akitomo,
Tsujimoto Akimasa,
Tsuchiya Kenji,
Shibasaki Syo,
Matsuyoshi Saki,
Miyazaki Masashi
Publication year - 2015
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12164
Subject(s) - crosshead , composite material , adhesive , bond strength , composite number , materials science , immersion (mathematics) , universal testing machine , hydrogen bond , resin composite , chemistry , ultimate tensile strength , molecule , flexural strength , layer (electronics) , organic chemistry , mathematics , pure mathematics
The influence of methyl mercaptan on the repair bond strength of composites fabricated using self‐etch adhesives was investigated. The surface free‐energies were determined by measuring the contact angles of test liquids placed on composites that had been immersed in different concentrations of methyl mercaptan (0.01, 0.1, and 1.0 M). To determine the repair bond strength, self‐etch adhesives were applied to the aged composite, and then newly added composites were condensed. Ten samples of each specimen were subjected to shear testing at a crosshead speed of 1.0 mm min −1 . Samples were analyzed using two‐way anova followed by T ukey's honestly significant difference ( HSD ) test. Although the dispersion force of the composites remained relatively constant, their polar force increased slightly as the concentration of methyl mercaptan increased. The hydrogen‐bonding forces were significantly higher after immersion in 1.0 M methyl mercaptan, leading to higher surface‐free energies. However, the repair bond strengths for the repair restorations prepared from composites immersed in 1.0 M methyl mercaptan were significantly lower than for those immersed in 0.01 and 0.10 M methyl mercaptan. Considering the results of this study, it can be concluded that the repair bond strengths of both the aged and newly added composites were affected by immersion in methyl mercaptan solutions.