Changes in µ-TBS to pulp chamber dentin after the application of NaOCl & reversal effect by using sodium ascorbate

Article information

Restor Dent Endod. 2009;34(6):515-525

Publication date (electronic) : 2009 November 30

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

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 2009 October 09; Revised 2009 October 21; Accepted 2009 October 22.

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

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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.