The effect of C-factor and volume on microleakage of composite resin restorations with enamel margins

Bong-Joo Koo; Dong-Hoon Shin

doi:10.5395/JKACD.2006.31.6.452

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Koo and Shin: The effect of C-factor and volume on microleakage of composite resin restorations with enamel margins

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2006; 31(6): 452-459.

Published online: 30 November 2006

DOI: https://doi.org/10.5395/JKACD.2006.31.6.452

The effect of C-factor and volume on microleakage of composite resin restorations with enamel margins

Bong-Joo Koo, Dong-Hoon Shin

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

Corresponding Author: Dong-Hoon Shin. Department of Conservative Dentistry College of Dentistry, Dankook University 7-1 Shinbu-dong, Cheonan, Korea. Tel: 82-41-550-1965, Fax: 82-41-550-1963, donyshin@dankook.ac.kr

Received 4 September 2006 Revised 30 October 2006 Accepted 4 November 2006

(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

Competition will usually develop between the opposing walls as the restorative resin shrinks during polymerization. Magnitude of this phenomenon may be depended upon cavity configuration and volume.

The purpose of this sturdy was to evaluate the effect of cavity configuration and volume on microleakage of composite resin restoration that has margins on the enamel site only.

The labial enamel of forty bovine teeth was ground using a model trimmer to expose a flat enamel surface. Four groups with cylindrical cavities were defined, according to volume and configuration factor (Depth × Diameter / C-factor) - Group I: 1.5 mm × 2.0 mm / 4.0, Group II: 1.5 mm × 6.0 mm / 2.0, Group III: 2.0 mm × 1.72 mm / 5.62, Group IV: 2.0 mm × 5.23 mm / 2.54.

After treating with fifth-generation one-bottle adhesive - BC Plus™ (Vericom, AnYang, Korea), cavities were bulk filled with microhybrid composite resin - Denfill™ (Vericom). Teeth were stored in distilled water for one day at room temperature and were finished and polished with Sof-Lex system. Specimens were thermocycled 500 times between 5℃ and 55℃ for 30 second at each temperature.

Teeth were isolated with two layers of nail varnish except the restoration surface and 1 mm surrounding margins. Electrical conductivity (µA) was recorded in distilled water by electrochemical method. Microleakage scores were compared and analyzed using two-way ANOVA at 95% level.

The results were as follows:

1. Small cavity volume showed lower microleakage score than large one, however, there was no statistically significant difference.

2. There was no relationship between cavity configuration and microleakage.

Factors of cavity configuration and volume did not affect on microleakage of resin restorations with enamel margins only.

Keywords: Polymerization shrinkage, Configuration factor, Volume Electrical conductivity, Microleakage

Figures and Tables

Figure 1

Schematic drawing of electrochemical test.

Table 1

Composition of Composite and Adhesive used

Table 2

Classification according to Cavity Volume and C-factor

Table 3

Currents and statistical result with Volume (µA)

Significant difference at p^* < 0.05

Table 4

Currents and statistical result with C-factor (µA)

Significant difference at p^* < 0.05

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