Influence of Sodium Ascorbate on Microtensile Bond Strengths to Pulp Chamber Dentin treated with NaOCl

Soo-Yeon Jeon; Kwang-Won Lee; Mi-Kyung Yu

doi:10.5395/JKACD.2008.33.6.545

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Jeon, Lee, and Yu: Influence of Sodium Ascorbate on Microtensile Bond Strengths to Pulp Chamber Dentin treated with NaOCl

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2008; 33(6): 545-552.

Published online: 30 November 2008

DOI: https://doi.org/10.5395/JKACD.2008.33.6.545

Influence of Sodium Ascorbate on Microtensile Bond Strengths to Pulp Chamber Dentin treated with NaOCl

Soo-Yeon Jeon, Kwang-Won Lee, Mi-Kyung Yu

Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Korea.

Corresponding Author: Mi-Kyung Yu. Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, Geumam-Dong, Deokjin-Gu, Jeonju, Jeonbuk, 561-712, Korea. Tel: 82-63-250-2045, Fax: 82-63-250-2129, mkyou102@hanmail.net

Received 13 August 2008 Revised 9 September 2008 Accepted 14 October 2008

(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

The purpose of this study was to evaluate the influence of sodium ascorbate on microtensile bond strengths of total-etching adhesive system to pulp chamber dentin treated with NaOCl.

Pulp chambers of extracted human non-caries permanent molars were treated as follows: group 1, with 0.9% NaCl; group 2, with 5.25% NaOCl; group 3, with 5.25% NaOCl and 10% sodium ascorbate for 1min; group 4, with 5.25% NaOCl and 10% sodium ascorbate for 1 min and 10ml of water; group 5, with 5.25% NaOCl and 10% sodium ascorbate for 5 min; group 6, with 5.25% NaOCl and 10% sodium ascorbate for 5 min and 10ml of water; group 7, with 5.25% NaOCl and 10% sodium ascorbate for 10 min; group 8, with 5.25% NaOCl and 10% sodium ascorbate for 10 min and 10ml of water. Treated specimens were dried, bonded with a total-etching adhesive system (Single bond), restored with a composite resin(Z250) and kept for 24h at 100% humidity to measure the microtensile bond strength.

NaOCl-treated group (group 2) demonstrated significantly lower strength than the other groups. No significant difference in microtensile bond strengths was found between NaCl-treated group (group 1) and sodium ascorbate-treated groups (group 3-8). The results of this study indicated that dentin treated with NaOCl reduced the microtensile bond strength of Single bond. Application of 10% sodium ascorbate restored the bond strength of Single bond on NaOCl-treated dentin. Application time of sodium ascorbate did not have a significant effect.

Keywords: Microtensile bond strengths, NaOCl, Pulp chamber dentin, Sodium ascorbate, Total etching adhesive system

Figures and Tables

Figure 1

Schematic of specimen preparation.

Figure 2

Upper view of Micro Tensile Tester.

Figure 3

Diagram of microtensile bond strengths between eight experimental groups

Figure 4

0.9% NaCl (1K).

Figure 5

0.9% NaCl (5K).

Figure 6

5.25% NaOCl (1K)

Figure 7

5.25% NaOCl (5K)

Figure 8

NaOCl+sodium ascorbate(1K)

Figure 9

NaOCl+sodium ascorbate (5K)

Figure 10

NaOCl + sodium ascorbate + water (1K)

Figure 11

NaOCl + sodium ascorbate + water (5K)

Table 1

Experimental groups and treatments

Table 2

Means and standard deviations of the microtensile bond strength of experimental groups to dentin of pulp chamber wall

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