Toshiki Takamizawa1, Wayne W Barkmeier2, Akimasa Tsujimoto3, Donal D Scheidel4, Hidehiko Watanabe5, Robert L Erickson2, Mark A Latta2, Masashi Miyazaki3. 1. Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan. Electronic address: takamizawa.toshiki@nihon-u.ac.jp. 2. Department of General Dentistry, Creighton University School of Dentistry, Omaha, NE, USA. 3. Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan. 4. Department of Diagnostic Sciences, Creighton University School of Dentistry, USA. 5. Section of Operative Dentistry, University of Nebraska, Lincoln, Nebraska, USA.
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-ӕnial 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.
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-ӕnial 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.
Authors: Akimasa Tsujimoto; Wayne W Barkmeier; Erica C Teixeira; Toshiki Takamizawa; Masashi Miyazaki; Mark A Latta Journal: Jpn Dent Sci Rev Date: 2022-06-25
Authors: Andreas Hellak; Jennifer Ebeling; Michael Schauseil; Steffen Stein; Matthias Roggendorf; Heike Korbmacher-Steiner Journal: Biomed Res Int Date: 2016-09-21 Impact factor: 3.411