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HOME > Restor Dent Endod > Volume 34(6); 2009 > Article
Original Article Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate
Su-Mi Kwon, Tae-Gun Kim, Mi-Kyung Yu, Kwang-Won Lee
2009;34(6):-525.
DOI: https://doi.org/10.5395/JKACD.2009.34.6.515
Published online: November 30, 2009

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Corresponding Author: Kwang-Won Lee. Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, 664-14, Duckjin-Dong, Duckjin-Gu, Jeonju 561-756, Korea. Tel: 82-63-250-2016, lkw@chonbuk.ac.kr
• Received: October 9, 2009   • Revised: October 21, 2009   • Accepted: October 22, 2009

Copyright © 2009 The Korean Academy of Conservative Dentistry

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  • Clinical suggestion for the limitation of application time of NaOCl solution is needed to avoid large reductions in resin-dentin bond strength. The aim of this study was to measure the change of µ-tensile bond strength after the various application time of 5.25% NaOCl solution to pulp chamber dentin in endodontic access cavity, and to evaluate the effect of 10% sodium ascorbate application for 10 min on bond strength after the treatment of 5.25% NaOCl solution. In this experiment, there were no statistical differences(p>0.05) in bond strengths between upper chamber dentin and lower chamber dentin. NaOCl-treated group for 20 min did not show any significant decrease(p>0.05) in bond strength than non-treated control group. In contrast to that, bond strengths of NaOCl-treated groups for 40 & 80 min were significantly lower(p<0.05) than that of non-treated control group.
    10% sodium ascorbate retreated group for 10 min after 5.25% NaOCl application for 40 min to chamber dentin showed the recovery of bond strength significantly. However, the bond strength of sodium ascorbate retreated group after 5.25% NaOCl application for 80 min was still significantly lower(p<0.05) compared to the non-treated control group, which means the reductions in resin-dentin bond strength were not fully reversed. On the contrary, sodium ascorbate retreated group after 5.25% NaOCl application for 5 min showed significantly higher(p<0.05) bond strength compared to the control group, which demonstrates its superior recovery effect. In SEM exminations of specimens retreated with 10% sodium ascorbate after NaOCl application for 40 & 80 min showed that resin tags were formed clearly and densely, but weakly in density and homogeneity of individual resin tag compared to the control specimen.
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Figure 1
Schematic illustration of specimen preparation for µ-TBS test.
jkacd-34-515-g001.jpg
Figure 2
Schematic illustration of stick preparation for µ-TBS test.
jkacd-34-515-g002.jpg
Figure 3
Schematic illustration of specimen preparation for SEM examination.
jkacd-34-515-g003.jpg
Figure 4
µ-TBS to NaOCl-treated upper and lower chamber dentin.
jkacd-34-515-g004.jpg
Figure 5
µ-TBS to chamber dentin after the application of certain period of time using 5.25% NaOCl. Asterisk(*) means statistical difference between groups.
jkacd-34-515-g005.jpg
Figure 6
µ-TBS to chamber dentin after the treatment of 5.25% NaOCl +10% sodium ascorbate. Small letter(a,b) means statistical difference between groups.
jkacd-34-515-g006.jpg
Figure 7
Summarization of µ-TBS to chamber dentin after the treatment of 5.25% NaOCl and 5.25% NaOCl +10% sodium ascorbate.
jkacd-34-515-g007.jpg
Figure 8
SEM examination after the application of certain period of time using 5.25% NaOCl.
jkacd-34-515-g008.jpg
Figure 9
SEM examination after the treatment of 5.25% NaOCl and 5.25% NaOCl +10% sodium ascorbate.
jkacd-34-515-g009.jpg
Table 1
Specimen preparation according to the application time of 5.25% NaOCl to the chamber dentin.
jkacd-34-515-i001.jpg
Table 2
Specimen preparation according to the application of sodium ascorbate to the NaOCl-treated chamber dentin.
jkacd-34-515-i002.jpg
Table 3
µ-TBS to NaOCl-treated upper & lower chamber dentin
jkacd-34-515-i003.jpg
Table 4
µ-TBS to chamber dentin after the application of certain period of time using 5.25% NaOCl
jkacd-34-515-i004.jpg
Table 5
µ-TBS to chamber dentin after the application of sodium ascorbate to the NaOCl-treated chamber dentin.
jkacd-34-515-i005.jpg

Tables & Figures

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    • Influence of Sodium Hypochorite & EDTA on the Microtensile Bond Strength of Ethanol Wet Bonding
      Deok-Joong Kim, Yong-Beom Song, Sang-Hee Park, Hyoung-Sun Kim, Hye-Yoon Lee, Mi-Kyung Yu, Kwang-Won Lee
      Journal of Dental Rehabilitation and Applied Science.2013; 29(1): 37.     CrossRef

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      Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate
      J Korean Acad Conserv Dent. 2009;34(6):515-525.   Published online November 30, 2009
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    Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate
    Image Image Image Image Image Image Image Image Image
    Figure 1 Schematic illustration of specimen preparation for µ-TBS test.
    Figure 2 Schematic illustration of stick preparation for µ-TBS test.
    Figure 3 Schematic illustration of specimen preparation for SEM examination.
    Figure 4 µ-TBS to NaOCl-treated upper and lower chamber dentin.
    Figure 5 µ-TBS to chamber dentin after the application of certain period of time using 5.25% NaOCl. Asterisk(*) means statistical difference between groups.
    Figure 6 µ-TBS to chamber dentin after the treatment of 5.25% NaOCl +10% sodium ascorbate. Small letter(a,b) means statistical difference between groups.
    Figure 7 Summarization of µ-TBS to chamber dentin after the treatment of 5.25% NaOCl and 5.25% NaOCl +10% sodium ascorbate.
    Figure 8 SEM examination after the application of certain period of time using 5.25% NaOCl.
    Figure 9 SEM examination after the treatment of 5.25% NaOCl and 5.25% NaOCl +10% sodium ascorbate.
    Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate

    Specimen preparation according to the application time of 5.25% NaOCl to the chamber dentin.

    Specimen preparation according to the application of sodium ascorbate to the NaOCl-treated chamber dentin.

    µ-TBS to NaOCl-treated upper & lower chamber dentin

    µ-TBS to chamber dentin after the application of certain period of time using 5.25% NaOCl

    µ-TBS to chamber dentin after the application of sodium ascorbate to the NaOCl-treated chamber dentin.

    Table 1 Specimen preparation according to the application time of 5.25% NaOCl to the chamber dentin.

    Table 2 Specimen preparation according to the application of sodium ascorbate to the NaOCl-treated chamber dentin.

    Table 3 µ-TBS to NaOCl-treated upper & lower chamber dentin

    Table 4 µ-TBS to chamber dentin after the application of certain period of time using 5.25% NaOCl

    Table 5 µ-TBS to chamber dentin after the application of sodium ascorbate to the NaOCl-treated chamber dentin.


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