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The effect of concentration and application time of hydrogen peroxide on the microtensile bond strength of resin restorations to the dentin at different depths


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The effect of concentration and application time of hydrogen peroxide on the microtensile bond strength of resin restorations to the dentin at different depths

Article information

Restor Dent Endod. 2009;34(5):406-414
Publication date (electronic) : 2009 September 30
doi : https://doi.org/10.5395/JKACD.2009.34.5.406
Jeong-Lyong Son, Gye-Young Lee, Yu-Mi Kang, Young-Taek Oh, Kwang-Won Lee, Tae-Gun Kim
Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Korea.
Corresponding Author: Tae-Gun Kim. Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Geumam-Dong, Deokjin-Gu, Jeonju, Jeonbuk, 561-712, Korea. Tel: 82-63-250-2319, Fax: 82-63-250-2049, banana994404@daum.net
Received 2009 June 18; Revised 2009 July 16; Accepted 2009 September 02.

Abstract

The purpose of this study was to examine the effect of hydrogen peroxide at different application time and concentrations on the microtensile bond strength of resin restorations to the deep and the pulp chamber dentin.

A conventional endodontic access cavity was prepared in each tooth, and then the teeth were randomly divided into 1 control group and 4 experimental groups as follows: Group 1, non treated; Group 2, with 20% Hydrogen peroxide(H2O2); Group 3, with 10% H2O2; Group 4, with 5% H2O2; Group 5, with 2.5% H2O2; the teeth of all groups except group 1 were treated for 20, 10, and 5min. The treated teeth were filled using a Superbond C&B (Sun medical Co., Shiga, Japan). Thereafter, the specimens were stored in distilled water at 37℃ for 24-hours and then sectioned into the deep and the chamber dentin. The microtensile bond strength values of each group were analyzed by 3-way ANOVA and Tukey post hoc test(p < 0.05).

In this study, the microtensile bond strength of the deep dentin (D1) was significantly greater than that of the pulp chamber dentin (D2) in the all groups tested. The average of microtensile bond strength was decreased as the concentration and the application time of H2O2 were increased. Analysis showed significant correlation effect not only between the depth of the dentin and the concentration of H2O2 but also between the concentration of H2O2 and the application time(p < 0.05), while no significant difference existed among these three variables(p > 0.05). The higher H2O2 concentration, the more opened dentinal tubules under a scanning electron microscope(SEM) examination.

Keywords: Hydrogen peroxide; Microtensile bond strength; Deep dentin; Pulp chamber dentin; Oxidizing action; Free radical mechanism; Superbond C&B

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Article information Continued

Copyright © 2009 The 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.

Figure 1

Figure 1

Schematic presentation of the disc preparation at the deep and the pulp chamber dentin

Figure 2

Figure 2

The manufacture of specimen

Figure 3

Figure 3

Schematic measurement of the microtensile bond strength

Figure 4

Figure 4

Control group(2K). Most surface was covered with smear layer and had scratches (black arrow) due to using a diamond bur. A. D1, B. D2, Bar=20µm.

Figure 5

Figure 5

With 20% H2O2 for 20min(2K). Dentinal tubules (white arrow head) were opened completely and the smear layer scarcely remained. A. D1, B. D2, Bar=20µm.

Figure 6

Figure 6

With 10% H2O2 for 20min(2K). Dentinal tubules (white arrow head) were opened in a part and the smear layer remained. A. D1, B. D2, Bar=20µm.

Figure 7

Figure 7

With 5% H2O2 for 20min(2K). A. D1, Dentinal tubules (white arrow head) were obscure and covered with the smear layer; B. D2, Dentinal tubules were clear and opened in a part. Bar=20µm.

Figure 8

Figure 8

With 2.5% H2O2 for 20min(2K). Dentinal tubules (white arrow head) were obscure and covered with the smear layer. A: D1; B: D2; the surface of D1 and D2 had a similar pattern; Bar=20µm.

Table 1

Averages of the microtensile bond strength to the deep and the pulp chamber dentin by H2O2 concentration and application time(Mean±SD).

Table 1

Table 2

3-way ANOVA results showing the relations among the depth of dentin, the concentration and the application time of H2O2

Table 2

D: Depth, C: Concentrations, A: Application times

*: significant, NS: not significant

Table 3

Interfacial, Resin and Dentin failures in D1.

Table 3

Table 4

Interfacial, Resin and Dentin failures in D2.

Table 4