Effect of a new resin monomer on the microleakage of composite resin restorations

JH Bae; YK Kim; PY Yoon; MA Lee; BH Cho

doi:10.5395/JKACD.2007.32.5.469

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Bae, Kim, Yoon, Lee, and Cho: Effect of a new resin monomer on the microleakage of composite resin restorations

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2007; 32(5): 469-475.

Published online: 30 September 2007

DOI: https://doi.org/10.5395/JKACD.2007.32.5.469

Effect of a new resin monomer on the microleakage of composite resin restorations

JH Bae¹, YK Kim², PY Yoon², MA Lee³, BH Cho^3,⁴

¹Department of Conservative Dentistry, Seoul National University Bundang Hospital, Korea.

²Department of Oral Maxilofacial Surgery, Seoul National University Bundang Hospital, Korea.

³Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

⁴Dental Research Institute, Seoul National University, Korea.

Corresponding Author: Byeong-Hoon Cho. Department of Conservative Dentistry, School of Dentistry, Seoul National University 28 Yeongeon-dong, Jongro-gu Seoul, 110-749, Korea. Tel: 82-2-2072-3514, Fax: 82-2-764-3514, chobh@snu.ac.kr

Received 11 July 2007 Revised 25 July 2007 Accepted 11 August 2007

(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 effect of a new resin monomer on the microleakage of composite resin restorations. By adding new methoxylated Bis-GMA (Bis-M-GMA, 2,2-bis[4-(2-methoxy-3-methacryloyloxy propoxy) phenyl] propane) having low viscosity, the content of TEGDMA which has adverse effects on polymerization shrinkage might be decreased. As a result, microleakage might be improved.

2 mm × 2 mm × 2 mm cavities with occlusal margins in enamel and gingival margins in dentin were prepared on buccal and lingual surfaces of 40 extracted human premolars. Prepared teeth were randomly divided into four groups and restored with Clearfil SE bond (Kuraray, Japan) and one of experimental composite resins; EX1, Experimental composite resin1 (Bis-M-GMA/TEGDMA = 95/5 wt%, 40 nm nanofillers); EX2, Experimental composite resin2 (Bis-M-GMA/TEGDMA = 95/5 wt%, 20 nm nanofillers); EX3, Experimental composite resin3 (Bis-GMA/TEGDMA = 70/30 wt%, 40 nm nanofillers); and Filtek Z250 (3M ESPE, USA) was filled as a control group. The restored teeth were thermocycled, and immersed in 2% methylene blue solution for 24 hours. The teeth were sectioned buccolingually with a low speed diamond saw and evaluated for microleakage under stereomicroscope. The data were statistically analyzed by Pearson Chi-Square test and Fisher Exact test (p = 0.05).

The microleakage scores seen at the enamel margin were significantly lower than those of dentin margin (p = 0.007). There were no significant differences among the composite resins in the microleakage scores within each margin (p > 0.05). Bis-M-GMA, a new resin monomer having low viscosity, might in part replace high viscous Bis-GMA and might improve the quality of composite resin.

Keywords: Microleakage, New resin monomer, Bis-M-GMA, Viscosity, Polymerization shrinkage

Figures and Tables

Figure 1

A specimen of EX1 showed score 0 at enamel margin and dentin margin.

Figure 2

A Specimen of EX2 showed score 0 at enamel margin and score 2 at dentin margin.

Figure 3

A specimen of EX3 showed score 0 at enamel margin and score 3 at dentin margin.

Table 1

The composition of experimental composite resins (Unit: wt%)

The numbers were percentage of the composition within each experimental resin.

Table 2

Number of specimens showing microleakage scores at enamel and dentin margins of cervical box cavities filled with composite resins bonded with an adhesive system (n = 20, unit: N(%)^¶)

^¶The numbers in the parentheses were percentage of the specimens within the group restored with the same composite resin and same position.

^§p values by Fisher's Exact test

^†Proportion of microleakage score in enamel margin was significantly different from that in dentin margin (p = 0.007).

Notes

This work was supported by a grant from the Ministry of Health and Welfare of Korea (Grant No. 03-PJ1-PG1-CH09-0001).

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