Effects of saliva contamination and phosphoric acid composition on bond strength |
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Authors: | JA O'Brien III DrDH Retief EL Bradley FR Denys |
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Institution: | 1. Department of Biostatistics and Biomathematics, University of Alabama at Birmingham, Birmingham, U.S.A.;2. Department of Biomaterials, University of Alabama School of Dentistry, University of Alabama at Birmingham, University Station, Birmingham, AL 35294, U.S.A.;1. Department of Physics, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey;2. Department of Electrical and Electronics Engineering, Hakkari University, Hakkari, Turkey;3. Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey;1. INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, France;2. Clermont Université, VetAgro Sup, UMR Herbivores, BP 10448, F-63000 Clermont-Ferrand, France;3. Université de Lyon, VetAgro Sup, UMR1213 Herbivores, F-69280 Marcy l׳Etoile, France;4. INRA, UMR 1198 Biologie du Développement et Reproduction, F-78352 Jouy-en-Josas, France;5. INRA, UCEA Bressonvilliers, 91630 Leudeville France;1. Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX;2. Department of Surgery, The University of Texas-Houston Medical School, Houston, TX;1. Department of Conservative Dentistry & Endodontics, Manipal College of Dental Sciences, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India;2. Department of Dental Materials, Manipal College of Dental Sciences, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India;3. Department of Public Health Dentistry, Manipal College of Dental Sciences, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India |
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Abstract: | The purpose of this study was to determine the effects of a phosphoric acid gel and solution, and saliva contamination of etched enamel on the tensile bond strength (TBS) of a posterior composite resin to etched enamel. Ninety-six extracted human permanent maxillary canines were used in this study. The test system developed by Kemper and Kilian was used to determine the TBS of a posterior composite resin (P-10) to enamel. The ground enamel surfaces were etched with 37% H3PO4 gel for 60 sec and washed for 15 sec or 30 sec, and with 37% H3PO4 solution for 60 sec and washed for 15 sec or 30 sec, respectively. The ground enamel surfaces were also etched with H3PO4 gel for 60 sec, washed for 15 sec and rewashed for 15 sec after saliva contamination of the etched enamel for 15 sec, 60 sec and 60 min, respectively. Etched enamel surfaces contaminated with saliva for 15 sec were re-etched for 15 sec and washed for 15 sec. The test specimens were mounted in an Instron machine and subjected to a tensile load at 0.02 inch. min−1. The force required to break a test specimen was recorded, and the bond strengths were calculated and expressed in MN.m−2. The data were analyzed by ANOVA and Duncan's multiple range test at the 5% level of significance. The H3PO4 composition (gel vs solution) and wash times had no significantly different effect on TBS. Only a 60 min saliva contamination significantly reduced TBS. In this study the TBS was determined 24 h after specimen preparation. It is possible that salivary contamination of etched enamel may have an adverse effect on bond strength only after prolonged immersion of the test specimens prior to testing. |
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Keywords: | phosphoric acid gel and solution saliva contamination bond strnegth |
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