Su-Mi Kwon; Tae-Gun Kim; Mi-Kyung Yu; Kwang-Won Lee

doi:10.5395/JKACD.2009.34.6.515

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Kwon, Kim, Yu, and Lee: Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2009; 34(6): 515-525.

Published online: 30 November 2009

DOI: https://doi.org/10.5395/JKACD.2009.34.6.515

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

Department of Conservative Dentistry, School of Dentistry & Institute of Oral Bioscience, Chonbuk National University, Korea.

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 9 October 2009 Revised 21 October 2009 Accepted 22 October 2009

(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.

Abstract

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.

Keywords: µ-TBS to Pulp Chamber Dentin, NaOCl, Reversal Effect, Sodium Ascorbate

Figures and Tables

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.

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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