Influence of microhardness and fluoride content of tooth structure by fluoride-containing restorative materials

Su-Jong Lee; Young-Gon Cho; Jong-Uk Kim; Byung-Cheul Park

doi:10.5395/JKACD.2004.29.1.036

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Lee, Cho, Kim, and Park: Influence of microhardness and fluoride content of tooth structure by fluoride-containing restorative materials

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2004; 29(1): 36-43.

Published online: 31 January 2004

DOI: https://doi.org/10.5395/JKACD.2004.29.1.036

Influence of microhardness and fluoride content of tooth structure by fluoride-containing restorative materials

Su-Jong Lee, Young-Gon Cho, Jong-Uk Kim, Byung-Cheul Park

Department of Conservative Dentistry, College of Dentistry, Chosun University, Korea.

Corresponding author: Young-Gon Cho. Department of Conservative Dentistry, College of Dentistry, Chosun University, 375 Susuk-dong, Dong-gu, Gwangju 501-759, Korea. Tel: 062)220-3840, Fax: 062)232-9064, ygcho@mail.chosun.ac.kr

(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 compare the microhardness and the fluoride content of enamel and dentin around fluoride- or non fluoride-containing restorations. Forty extracted human teeth were used and prepared cervical cavities on proximal surface. Experimental teeth were divided into five groups. Group 1 : Prime & Bond NT and Z100, Group 2 : Prime & Bond NT and F2000, Group 3 : Scotchbond Multi-Purpose and Z100, Group 4 : Scothcbond Multi-purpose and F2000, Group 5 : Fuji II LC. The cavities were filled with dentin adhesives and restorative materials. After each tooth was bisected, one half was tested microhardness and the other half was analyzed the fluoride at the enamel and dentin by an EPMA-WDX device. The results were as follows:

1. There was no statistical difference among the microhardness of enamel surface in all group.

2. The microhardness at dentin of 100 µm point in Group 2 and 20 µm point in Group 4 was lower than that of normal dentin (p>0.05).

3. There was no statistical difference among the fluoride content of enamel surface in all group.

4. The fluoride content at the dentin of 30 µm point in Group 2 and 5 were higher than those at 100 µm and 200 µm point in Group 2 and normal dentin (p<0.05).

5. At the dentin of 30 µm point, Group 2 showed higher fluoride content than Group 1 and 3, and Group 5 showed higher fluoride content than other groups.

Keywords: Microhardness, Fluoride content, Fluoride-containing restorative materials Cervical cavities, Dentin adhesives, EPMA-WDX

Figures and Tables

Fig. 1

Diagram of proximal cavity preparation

Fig. 2

Diagram of indentation point for microhardness and EPMA test (F: Filling materials)

Table 1

Classification of group and materials used

Table 2

Microhardness values on enamel surface [Mean±S.D.](Knoop Hardness)

NE : Normal Enamel, RE : Enamel after Restoration

Table 3

Microhardness values on dentin surface [Mean±S.D.](Knoop Hardness)

ND : Normal Dentin, RD : Dentin after Restoration

^*: Significant differences between ND and RD in same depth (p<0.05)

Table 4

Atomic % of fluoride on enamel surface (EPMA/WDX)

Table 5

Atomic % of fluoride on dentin surface (EPMA/WDX)

Superscripts of the same letter indicate values of statistically no significant difference (p<0.05)

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