Microleakage of composite resin restoration according to the number of thermocycling

Chang-Youn Kim; Dong-Hoon Shin

doi:10.5395/JKACD.2007.32.4.377

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Kim and Shin: Microleakage of composite resin restoration according to the number of thermocycling

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2007; 32(4): 377-384.

Published online: 31 July 2007

DOI: https://doi.org/10.5395/JKACD.2007.32.4.377

Microleakage of composite resin restoration according to the number of thermocycling

Chang-Youn Kim, 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, Chungnam, 330-716, Korea. Tel: 82-41-550-1965, Fax: 82-41-550-1963, donyshin@dankook.ac.kr

Received 12 June 2007 Revised 27 June 2007 Accepted 28 June 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

Present tooth bonding system can be categorized into total etching bonding system (TE) and self-etching boding system (SE) based on their way of smear layer treatment. The purposes of this study were to compare the effectiveness between these two systems and to evaluate the effect of number of themocycling on microleakage of class V composite resin restorations.

Total forty class V cavities were prepared on the single-rooted bovine teeth and were randomly divided into four experimental groups: two kinds of bonding system and another two kinds of thermocycling groups. Half of the cavities were filled with Z250 follwing the use of TE system, Single Bond and another twenty cavities were filled with Metafil and AQ Bond, SE system. All composite restoratives were cured using light curing unit (XL2500, 3M ESPE, St. Paul, MN, USA) for 40 seconds with a light intensity of 600 mW/cm².

Teeth were stored in distilled water for one day at room temperature and were finished and polished with Sof-Lex system. Half of teeth were thermocycled 500 times and the other half were thermocycled 5,000 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.

From this study, following results were obtained: There was no interaction between variables of bonding system and number of thermocycling (p = 0.485). Microleakage was not affected by the number of thermocycling either (p = 0.814). However, Composite restoration of Metafil and AQ Bond, SE bond system showed less microleakage than composite restoration of Z250 and Single Bond, TE bond system (p = 0.005).

Keywords: Total etching bonding system, Self-etching bonding system, Thermocycling, Microleakage, Electrochemical method

Figures and Tables

Figure 1

Schematic drawing of electrochemical test.

Table 1

Component of dentin bonding systems

Table 2

Currents from electrochemical test (µA)

Different letters means statistically significant differences (p < 0.05)

Table 3

Two-way ANOVA result

Table 4

Currents between restoratives (µA)

Different letters means statistically significant differences (p < 0.05)

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