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Effect of a desensitizer on microtensile bond strength of different adhesives


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Effect of a desensitizer on microtensile bond strength of different adhesives

Article information

Restor Dent Endod. 2003;28(5):378-384
Publication date (electronic) : 2003 September 30
doi : https://doi.org/10.5395/JKACD.2003.28.5.378
Sung-Yeon Hwang, Kyung-Ha Lee, Mi-Kyung Yu, Kwang-Won Lee
Department of Conservative Dentistry & Institute for Oral Bioscience College of Dentistry, Chonbuk National University, Korea.
Corresponding author (lkw@moak.chonbuk.ac.kr)

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 midportion 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™) were incrementally build-up on the treated surface. The specimens for the microtensile test were serially sectioned perpendicular to the adhesive layer to obtain 0.7×0.7 mm 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±13.21; SMO-39.35±13.32; OMO-31.07±10.25; AMX-49.22±16.38; SMX-56.02±13.35; OMX-72.93±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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Article information Continued

Copyright © 2003 Korean Academy of Conservative Dentistry
(open-access) :

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Fig. 1

Fig. 1

Schematic illustration of microtensile test

Fig. 2

Fig. 2

Bar graph for comparison of microtensile bond strength of experimental groups.

Fig. 3

Fig. 3

AMX group(×1000)

Fig. 4

Fig. 4

AMO group(×1000)

Fig. 5

Fig. 5

SMX group(×1000)

Fig. 6

Fig. 6

SMO group(×1000)

Fig. 7

Fig. 7

OMX group(×1000)

Fig. 8

Fig. 8

OMO group(×1000)

Table 1

The composition of MS coat

Table 1

Table 2

Materials used in this study

Table 2

Table 3

Each group is classified as following

Table 3

Table 4

Microtensile bond strength of experimental groups

Table 4

Table 5

Comparison of microtensile bond strength among groups

Table 5