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[The studies on microtensile bond strength measurements of two dentin adhesives].
- Source :
-
Hua xi yi ke da xue xue bao = Journal of West China University of Medical Sciences = Huaxi yike daxue xuebao [Hua Xi Yi Ke Da Xue Xue Bao] 2001 Dec; Vol. 32 (4), pp. 519-23. - Publication Year :
- 2001
-
Abstract
- Objective: The purpose of this study was to investigate the feasibility of a modified microtensile method used to test bond strengths of two current one-bottle dentin bond systems (Prime & Bond NT, PBNT; Prime one Mirage, P-One) with a parallel match design.<br />Methods: 15 extracted, caries-free human molars were cut to expose occlusal dentin. A 5 mm deep slot was prepared in each crown to divide the crown into nearly equal halves for accepting treatment of the two dentin bond systems, respectively. After 24 h storage in distilled water at 37 degrees C, the bonded teeth were subjected to two treatments: 5 teeth were tested without further treatment and 10 teeth were thermocycled (2400 cycles, between 5 degrees C and 55 degrees C) prior to bond strength testing. Hour-glass shaped specimens with a distance of approximately 1.0 mm at the narrowest portion were cut from each tooth and tested in tensile mode.<br />Results: Bond strengths (mean MPa) were: for PBNT: 42 & 31, and for P-One 64 & 38 without and with thermocycling, respectively. Two-way ANOVA revealed a significant difference in bond strengths(P < 0.001) between the two systems and when thermocycled. However, a pairwise multiple comparison (Tukey test) showed that after thermocycling the difference between the two systems was not significant (P > 0.05). Regression analysis showed that a correlation existed between the two systems' tensile bond strength values grouped by tooth (correlation coefficient r = 0.575, P < 0.05).<br />Conclusion: The modified microtensile method with a parallel match design is feasible and suitable for evaluating two different bonding systems or dentin treatments.
Details
- Language :
- Chinese
- ISSN :
- 0257-7712
- Volume :
- 32
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Hua xi yi ke da xue xue bao = Journal of West China University of Medical Sciences = Huaxi yike daxue xuebao
- Publication Type :
- Academic Journal
- Accession number :
- 12528536