Comparative enamel bond strength between light- and dual-cured composites bonded by self-etching adhesives

Young-Gon Cho; Sang-Hoon Yoo

doi:10.5395/JKACD.2007.32.1.001

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Cho and Yoo: Comparative enamel bond strength between light- and dual-cured composites bonded by self-etching adhesives

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2007; 32(1): 1-8.

Published online: 31 January 2007

DOI: https://doi.org/10.5395/JKACD.2007.32.1.001

Comparative enamel bond strength between light- and dual-cured composites bonded by self-etching adhesives

Young-Gon Cho, Sang-Hoon Yoo

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

Corresponding Author: Young-Gon Cho. Department of Conservative Dentistry, College of Dentistry, Chosun University, 421 Seosuk-dong, Dong-gu, Gwangju 501-825, Korea. Tel: 82-62-220-3840, 3845, Fax: 82-62-232-9064, ygcho@mail.chosun.ac.kr

Received 7 May 2006 Revised 28 July 2006 Accepted 3 January 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

This study compared the microshear bond strength (µSBS) of light-cured and dual-cured composites to enamel bonded with three self-etching adhesives. Crown segments of extracted human molars were cut mesiodistally, and 1 mm thickness of specimen was made. They were assigned to three groups by used adhesives: Xeno group (Xeno III), Adper group (Adper Prompt L-Pop), and AQ group (AQ Bond). Each adhesive was applied to cut enamel surface as per manufacturer's instruction. Light-cured (Filtek Z 250) or dual-cured composite (Luxacore) was bonded to enamel of each specimen using Tygon tube.

After storage in distilled water for 24 hours, the bonded specimens were subjected to µSBS testing with a crosshead speed of 1 mm/minute. The mean µSBS (n = 20 for each group) was statistically compared using two-way ANOVA, Tukey HSD, and t test at the 0.05 probability level. The results of this study were as follows;

1. The µSBS of light-cured composite was significantly higher than that of dual-cured composite when same adhesive was applied to enamel.

2. For Z 250, the µSBS of AQ group (9.95 ± 2.51 MPa) to enamel was significantly higher than that of Adper goup (6.74 ± 1.80 MPa), but not significantly different with Xeno group (7.73 ± 2.01 MPa).

3. For Luxacore, the µSBS of Xeno group (5.19 ± 1.32 MPa) to enamel was significantly higher than that of Adper goup (3.41 ± 1.19 MPa), but not significantly different with AQ group (4.50 ± 0.96 MPa).

Keywords: Microshear bond strength, Light-cured composite, Dual-cured composite, Enamel, Self-etching adhesive

Figures and Tables

Figure 1

Bar graph showing microshear bond strengths for Z 250 and Luxacore to enamel.

Table 1

Gloup classification by self-etching adhesives

Table 2

Mean microshear bond strength (MPa) of Z 250 and Luxacore to enamel

Superscripts of the other letter indicate values of statistical significant difference by Tukey HSD and t test (p < 0.05).

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