TY - JOUR
T1 - Influence of water storage on fatigue strength of self-etch adhesives
AU - Takamizawa, Toshiki
AU - Barkmeier, Wayne W.
AU - Tsujimoto, Akimasa
AU - Scheidel, Donal D.
AU - Watanabe, Hidehiko
AU - Erickson, Robert L.
AU - Latta, Mark A.
AU - Miyazaki, Masashi
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Objectives: The purpose of this study was to determine enamel and dentin bond durability after long-term water storage using self-etch adhesives. Methods: Two single step self-etch adhesives (SU, Scotchbond Universal and GB, G-[U+04D5]nial Bond) and a two-step self-etch adhesive (OX, OptiBond XTR) were used. The shear bond strength (SBS) and shear fatigue strength (FS) of the enamel and dentin were obtained with and without phosphoric acid pre-etching prior to application of the adhesives. The specimens were stored in distilled water at 37. °C for 24. h, 6 months, and one year. A staircase method was used to determine the FS using a frequency of 10. Hz for 50,000 cycles or until failure occurred. Results: The SBS and FS of enamel bonds were significantly higher with pre-etching, when compared to no pre-etching for the same water storage period. The FS of dentin bonds with pre-etching tended to decrease relative to no pre-etching at the same storage period. For the one year storage period, SU and GB with pre-etching showed significantly lower FS values than the groups without pre-etching. Conclusions: The influence of water storage on FS of the self-etch adhesives was dependent on the adhesive material, storage period and phosphoric acid pre-etching of the bonding site. Clinical significance: Phosphoric acid pre-etching of enamel improves the effectiveness of self-etch adhesive systems. Inadvertent contact of phosphoric acid on dentin appears to reduce the ability of self-etch adhesives to effectively bond resin composite materials.
AB - Objectives: The purpose of this study was to determine enamel and dentin bond durability after long-term water storage using self-etch adhesives. Methods: Two single step self-etch adhesives (SU, Scotchbond Universal and GB, G-[U+04D5]nial Bond) and a two-step self-etch adhesive (OX, OptiBond XTR) were used. The shear bond strength (SBS) and shear fatigue strength (FS) of the enamel and dentin were obtained with and without phosphoric acid pre-etching prior to application of the adhesives. The specimens were stored in distilled water at 37. °C for 24. h, 6 months, and one year. A staircase method was used to determine the FS using a frequency of 10. Hz for 50,000 cycles or until failure occurred. Results: The SBS and FS of enamel bonds were significantly higher with pre-etching, when compared to no pre-etching for the same water storage period. The FS of dentin bonds with pre-etching tended to decrease relative to no pre-etching at the same storage period. For the one year storage period, SU and GB with pre-etching showed significantly lower FS values than the groups without pre-etching. Conclusions: The influence of water storage on FS of the self-etch adhesives was dependent on the adhesive material, storage period and phosphoric acid pre-etching of the bonding site. Clinical significance: Phosphoric acid pre-etching of enamel improves the effectiveness of self-etch adhesive systems. Inadvertent contact of phosphoric acid on dentin appears to reduce the ability of self-etch adhesives to effectively bond resin composite materials.
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U2 - 10.1016/j.jdent.2015.10.018
DO - 10.1016/j.jdent.2015.10.018
M3 - Article
C2 - 26520580
AN - SCOPUS:84949475822
VL - 43
SP - 1416
EP - 1427
JO - Journal of Dentistry
JF - Journal of Dentistry
SN - 0300-5712
IS - 12
ER -