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http://dx.doi.org/10.5395/JKACD.2003.28.5.378

EFFECT OF A DESENSITIZER ON MICROTENSILE BOND STRENGTH OF DIFFERENT ADHESIVES  

Hwang, Sung-Yeon (Department of Conservative Dentistry & Institute for Oral Bioscience College of Dentistry, Chonbuk National University)
Lee, Kyung-Ha (Department of Conservative Dentistry & Institute for Oral Bioscience College of Dentistry, Chonbuk National University)
Yu, Mi-Kyung (Department of Conservative Dentistry & Institute for Oral Bioscience College of Dentistry, Chonbuk National University)
Lee, Kwang-Won (Department of Conservative Dentistry & Institute for Oral Bioscience College of Dentistry, Chonbuk National University)
Publication Information
Restorative Dentistry and Endodontics / v.28, no.5, 2003 , pp. 378-384 More about this Journal
Abstract
This study evaluated the influence of a desensitizer(MS coat) on microtensile bond strength of different adhesives:a three-step adhesive(All-Bond 2), a two-step adhesive(Single Bond), a one-step adhesive(One-up Bond F). Non-caries extracted human molars were used. Dentin surface was obtained by horizontal section on mid-portion of crown using a water-cooled low speed diamond saw. Teeth were randomly divided into 6 group. AMO(MS coat + All Bond), SMO(MS coat + Single Bond)- and OMO(MS coat + One-up Bond F)-dentin surface were treated with 17% EDTA before bonded adhesive. AMX-, SMX- and OMX-dentin surface were bonded with All-Bond 2, Single Bond and One-up Bond F, respectively. with no previous treatment with MS coat and 17% EDTA. About 1cm high resin composite($Z-250^{TM}$) were incrementally build-up on the treated surface. The specimens for the microtensile test were serially sectioned perpendicular to the adhesive layer to obtain $0.7{\times}0.7mm$ sticks. 30 sticks were prepared from each group. After that. tensile bond strength for each stick was measured with Microtensile Tester at a 1mm/min crosshead speed. Fractured dentin surfaces were observed under the SEM. The results were statistically analysed by using a One-way ANOVA and Tukey's test(p<0.05). Value in MPa were: $AMO-44.35{\pm}13.21;{\;}SMO-39.35{\pm}13.32;{\;}OMO-31.07{\pm}10.25;{\;}AMX-49.22{\pm}16.38;{\;}SMX-56.02{\pm}13.35;{\;}OMX-72.93{\pm}16.19$. Application of MS coat reduced microtensile bond strengths of both Single Bond and One-up Bond F, whereas microtensile bond strengths of All-Bond 2 were not affected significantly.
Keywords
Microtensile; Desensitizer; Three-step adhesive; Two-step adhesive; One-step adhesive; Bond strength;
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