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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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Original Article The effect of concentration and application time of hydrogen peroxide on the microtensile bond strength of resin restorations to the dentin at different depths
Jeong-Lyong Son, Gye-Young Lee, Yu-Mi Kang, Young-Taek Oh, Kwang-Won Lee, Tae-Gun Kim
Journal of Korean Academy of Conservative Dentistry 2009;34(5):406-414.
DOI: https://doi.org/10.5395/JKACD.2009.34.5.406
Published online: September 30, 2009

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: June 18, 2009   • Revised: July 16, 2009   • Accepted: September 2, 2009

Copyright © 2009 The Korean Academy of Conservative Dentistry

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  • 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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Figure 1
Schematic presentation of the disc preparation at the deep and the pulp chamber dentin
jkacd-34-406-g001.jpg
Figure 2
The manufacture of specimen
jkacd-34-406-g002.jpg
Figure 3
Schematic measurement of the microtensile bond strength
jkacd-34-406-g003.jpg
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.
jkacd-34-406-g004.jpg
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.
jkacd-34-406-g005.jpg
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.
jkacd-34-406-g006.jpg
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.
jkacd-34-406-g007.jpg
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.
jkacd-34-406-g008.jpg
Table 1
Averages of the microtensile bond strength to the deep and the pulp chamber dentin by H2O2 concentration and application time(Mean±SD).
jkacd-34-406-i001.jpg
Table 2
3-way ANOVA results showing the relations among the depth of dentin, the concentration and the application time of H2O2

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

*: significant, NS: not significant

jkacd-34-406-i002.jpg
Table 3
Interfacial, Resin and Dentin failures in D1.
jkacd-34-406-i003.jpg
Table 4
Interfacial, Resin and Dentin failures in D2.
jkacd-34-406-i004.jpg

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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
        J Korean Acad Conserv Dent. 2009;34(5):406-414.   Published online September 30, 2009
        DOI: https://doi.org/10.5395/JKACD.2009.34.5.406
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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
      Image Image Image Image Image Image Image Image
      Figure 1 Schematic presentation of the disc preparation at the deep and the pulp chamber dentin
      Figure 2 The manufacture of specimen
      Figure 3 Schematic measurement of the microtensile bond strength
      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 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 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 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 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.

      Figure 1

      Figure 2

      Figure 3

      Figure 4

      Figure 5

      Figure 6

      Figure 7

      Figure 8

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

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

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

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

      *: significant, NS: not significant

      Interfacial, Resin and Dentin failures in D1.

      Interfacial, Resin and Dentin failures in D2.
      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 2 3-way ANOVA results showing the relations among the depth of dentin, the concentration and the application time of H2O2

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

      *: significant, NS: not significant

      Table 3 Interfacial, Resin and Dentin failures in D1.

      Table 4 Interfacial, Resin and Dentin failures in D2.

      Table 1

      Table 2

      Table 3

      Table 4

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