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|Title:||Effect of fluoride iontophoresis on the microtensile bond strength between dentin and two adhesive systems|
|Citation:||Journal of Dentistry, 2008; 36(9):697-702|
|Publisher:||Elsevier Sci Ltd|
|L.-J. Chen, Q.-F. Meng, Y.-M. Chen, R.J. Smales and K.H.-K. Yip|
|Abstract:||AIM: To evaluate the effect of fluoride iontophoresis on the microtensile bond strength (MTBS) between coronal dentin and two resin-based adhesive systems, and to measure quantitatively dentinal tubule occlusion. METHODS: Twelve freshly extracted intact human mandibular third molars were divided randomly into four groups. The superficial occlusal dentin of each tooth was exposed and treated. Group A1: One-Step Plus total-etch adhesive system; group A2: One-Step Plus total-etch adhesive system after fluoride iontophoresis; group B1: ACE BOND SE self-etching adhesive system; group B2: ACE BOND SE self-etching adhesive system after fluoride iontophoresis. A resin composite buildup was made for each tooth, which was then sectioned along its long axis to produce 10 beams (1.0 mm x 1.0 mm) for the microtensile bond strength (MTBS) test. Five dentin disks were cut in half and their occlusal surfaces etched with 6% citric acid. The test halves were treated with fluoride iontophoresis. Four SEM photomicrographs were taken from corresponding sites on each test and each non-treated control half-disk. Image-Pro Plus 4 software quantified the percentage of tubule occlusion. Data were analyzed using one-way ANOVA, chi(2)- and t-tests, with the probability level set at alpha=0.05. RESULTS: The mean MTBS (MPa) for each group was, A1: 30.86 (S.D. 6.84); A2: 25.04 (8.49); B1: 19.22 (6.88); B2: 19.40 (6.92). There were significant differences among all groups (P < or = 0.02), except between groups B1 and B2 (P=0.92). Fluoride iontophoresis resulted in significantly increased dentinal tubule occlusion (P<0.001). CONCLUSIONS: Fluoride iontophoresis treatment reduced significantly the dentin bond strength of One-Step Plus total-etch adhesive, but not that of ACE BOND SE self-etching adhesive. However, the bond strength of the former remained significantly higher than that of the latter adhesive system.|
|Keywords:||Molar; Dentin; Humans; Dentin Sensitivity; Fluorides; Resin Cements; Cariostatic Agents; Dentin-Bonding Agents; Microscopy, Electron, Scanning; Iontophoresis; Analysis of Variance; Dental Bonding; Acid Etching, Dental; Dental Stress Analysis; Surface Properties; Tensile Strength|
|Description:||Copyright © 2008 Elsevier Ltd All rights reserved.|
|Appears in Collections:||Dentistry publications|
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