Influence of water storage on fatigue strength of self-etch adhesives

Toshiki Takamizawa, Wayne W. Barkmeier, Akimasa Tsujimoto, Donal Scheidel, Hidehiko Watanabe, Robert L. Erickson, Mark A. Latta, Masashi Miyazaki

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalJournal of Dentistry
DOIs
StateAccepted/In press - May 27 2015

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Adhesives
Fatigue
Dentin
Dental Enamel
Water
Shear Strength
Composite Resins
phosphoric acid

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

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Influence of water storage on fatigue strength of self-etch adhesives. / Takamizawa, Toshiki; Barkmeier, Wayne W.; Tsujimoto, Akimasa; Scheidel, Donal; Watanabe, Hidehiko; Erickson, Robert L.; Latta, Mark A.; Miyazaki, Masashi.

In: Journal of Dentistry, 27.05.2015.

Research output: Contribution to journalArticle

Takamizawa, Toshiki ; Barkmeier, Wayne W. ; Tsujimoto, Akimasa ; Scheidel, Donal ; Watanabe, Hidehiko ; Erickson, Robert L. ; Latta, Mark A. ; Miyazaki, Masashi. / Influence of water storage on fatigue strength of self-etch adhesives. In: Journal of Dentistry. 2015.
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AU - Erickson, Robert L.

AU - Latta, Mark A.

AU - Miyazaki, Masashi

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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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