Effects of laser-irradiated dentin on shear bond strength of composite resin

Sung-Sook Kim; Jong-Il Park; Jae-In Lee; Gye-Sun Kim; Hye-Won Cho

doi:10.4047/jkap.2008.46.5.520

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Kim, Park, Lee, Kim, and Cho: Effects of laser-irradiated dentin on shear bond strength of composite resin

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2008;46(5):520-527.

Published online: NaN December 2008

DOI: https://doi.org/10.4047/jkap.2008.46.5.520

Effects of laser-irradiated dentin on shear bond strength of composite resin

Sung-Sook Kim, DDS, MSD¹, Jong-Il Park, DDS, MDD¹, Jae-In Lee, DDS, MSD¹, Gye-Sun Kim, DDS, MSD¹, Hye-Won Cho, MSD, DDS, PhD^2,

^¹Graduate student, Department of Dentistry, Graduate School, Wonkwang University, Korea

^²Professor, Department of Dentistry, Graduate School, Wonkwang University, Korea

Corresponding Author: Hye-Won Cho Department of Prosthodontics, School of Dentistry, Wonkwang University, 344-2, Shin-Yong Dong, Iksan, Chunbuk, 570-711, Korea Tel.: +82 63 589 2938 E-mail: hwcho@wonkwang.ac.kr

Received 11 July 200816 September 2008 Accepted 10 October 2008

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

Purpose

This study was conducted to evaluate the shear bond strength of composite resin to dentin when etched with laser instead of phosphoric acid.

Material and methods

Recently extracted forty molars, completely free of dental caries, were embedded into acrylic resin. After exposing dentin with diamond saw, teeth surface were polished with a series of SiC paper. The teeth were divided into four groups composed of 10 specimens each; 1) no surface treated group as a control 2) acid-etched with 35%-phosphoric acid 3) Er:YAG laser treated 4) Er,Cr:YSGG laser treated. A dentin bonding agent (Adapter Single Bond2, 3M/ESPE) was applied to the specimens and then transparent plastic tubes (3 mm of height and diameter) were placed on each dentin. The composite resin was inserted into the tubes and cured. All the specimens were stored in distilled water at 37℃ for 24 hours and the shear bond strength was measured using a universal testing machine (Z020, Zwick, Germany). The data of tensile bond strength were statistically analyzed by one-way ANOVA and Duncan's test at α = 0.05.

Results

The bond strengths of Er:YAG laser-treated group was 3.98 ± 0.88 MPa and Er,Cr:YSGG laser-treated group showed 3.70 ± 1.55 MPa. There were no significant differences between two laser groups. The control group showed the lowest bond strength, 1.52 ± 0.42 MPa and the highest shear bond strength was presented in acid-etched group, 7.10 ± 1.86 MPa (P < .05).

Conclusion

Laser-etched group exhibited significantly higer bond strength than that of control group, while still weaker than that of the phosphoric acid-etched group. (J Kor Acad Prosthodont 2008;46:520-7).

Keywords: Laser, Acid etching, Adhesion, Dentin, Composite resin, Bond strength

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Fig. 1

The assembly of specimen mounted on stainless steel jig on universal testing machine to measure the shear bond strength.

Fig. 2.

Shear bond strength (MPa) between dentin and composite resin after different surface treatments.

Fig. 3.

Scanning electron microscopic images at ×500 (a), 1000 (b), 2000 (c) of dentin after 35% phosphoric acid treatment.

Fig. 4.

Scanning electron microscopic images at ×500 (a), 1000 (b), 2000 (c) of dentin after Er:YAG laser treatment.

Fig. 5.

Scanning electron microscopic images at ×500 (a), 1000 (b), 2000 (c) of dentin after Er,Cr:YSGG laser treatment.

Table I.

Experimental groups

Groups	Dentin conditioning	Surface treament method	Product/Manufacturer
1	(control group)
2	acid etching	35% phosphoric acid gel	Scotchbond^™ (3M/ESPE, Seefeld, Germany)
3	Er:YAG laser etching	power 250 mJ frequency 4Hz defocused Tip: 2060
			K.E.Y laser3 (1243) (KaVo, Kaltenbach, Germany）
4	Er,Cr:YSGG laser etching	power 2W water 30%, air 30%, 30 Pps (Hz) defocused Tip: MG6	Waterlase (Biolase Europe GmbH, Paintweg, Germany)

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