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Yoon, Park, Kim, and Cho: EFFECT OF DENTIN SURFACE WETNESS ON TENSILE BOND STRENGTH OF SELF ADHESIVE RESIN CEMENTS
Original Article

J Korean Acad Conserv Dent 2009;34(2):113-119.

Published online: 14 January 2009

DOI: https://doi.org/10.5395/JKACD.2009.34.2.113

EFFECT OF DENTIN SURFACE WETNESS ON TENSILE BOND STRENGTH OF SELF ADHESIVE RESIN CEMENTS

Sung-Young Yoon, Se-Hee Park, Jin-Woo Kim, Kyung-Mo Cho*

Department of Conservative Dentistry, College of Dentistry, Kangnung National University

*Corresponding Author: Kyung-Mo Cho, Department of Conservative Dentistry College of Dentistry, Kangnung National University, 123 Chibyon-dong Gangwon-do, Korea, Tel: 82-33-640-2470 Fax: 82-33-642-6410 E-mail: drbozon@kangnung.ac.kr

Received 31 December 2008       Revised 9 February 2009       Accepted 17 February 2009

Copyright © 2009 The Korean Academy of Conservative Dentistry

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 compare the tensile bond strength of several self-adhesive resin cements bonded to dentin surfaces with different wet conditions.
Three self-adhesive resin cements; Rely-X Unicem (3M ESPE, St. Paul, MN, USA), Embrace Wetbond (Pulpdent, Oakland, MA, USA), Maxcem (Kerr, Orange, CA, USA) were used. Extracted sixty human molars were used. Each self-adhesive resin cement was adhered to the dentin specimens (two rectangular sticks from each molar) in different wet conditions.
Tensile bond strength were measured using universal testing machine (EZ Test, Shimadzu corporation, Kyoto, Japan) at a crosshead speed of 1.0mm/min. After the testing, bonding failures of specimens were observed by Operative microscope (OPMI pro, Carl Zeiss, Oberkochen, Germany). T-test was used to evaluate the effect of dentin surface wetness. One-way ANOVA test was used to evaluate the tensile bond strength of self-adhesive resin cements in the same condition. Scheffe's test was used for statistical analyzing at the 95% level of confidence.
The result showed that wetness of dentin surface didn't affect tensile bond strength of self-adhesive resin cements and Maxcem showed the lowest tensile bond strength.

Keywords: Self-adhesive resin cements, Tensile bond strength, Dentin surface wetness

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Figure 1.
Specimen preparation for tensile bond strength.
jkacd-34-113f1.tif
Figure 2.
Schematic drawing of moulds.
jkacd-34-113f2.tif
Table 1.
Composition of materials used in this study
Group Composition
Rely-X Unicem Powder: glass powder, silica, calcium hydroxide, pigment,
   substituted pyrimidine, peroxy compound, initiator.
Liquid: methacrylated phosphoric ester, dimethacrylate,
   acetate, stabilizer, initiator
Embrace Wetbond urethane methacrylate monomer, mono-2-methacryloyloxy ethyl, glass filler,
BA-30, sodium fluoride
Maxcem GPDM, co-monomers(mono-, di-, tri-functional methacrylate monomers),
proprietary self-curing redox activator, stabilizer, camphorquinone, barium glass fillers,
fluoroaluminosilicate glass fillers, fumed silica

GDPM; Glycerol dimethacrylate dihydrogen phosphate

Table 2.
Handling methods of the resin cement
Group Procedure
Rely-X Unicem Activate the capsule for 2s and mix it for 10s (Rotomix, 3M ESPE)
Embrace Wetbond Mix and the base and catalyst though the automix dual-barrel syringe
Maxcem Mix the base and catalyst through the automix dual-barrel syringe
Table 3.
Means of self-adhesive resin cements according to dentin wetness
Resin cements Dentin surface n Mean(MPa) ± SD
Unicem Dry 20 2.51 ± 0.01
Wet 20 2.51 ± 0.01
Embrace Dry 20 2.46 ± 0.24
Wet 20 2.51 ± 0.01
Maxcem Dry 20 2.05 ± 0.58
Wet 20 2.13 ± 0.48
Table 4.
Comparison between self-adhesive resin cements on dry group
jkacd-34-113-t4.tif
Table 5.
Comparison between self-adhesive resin cements on wet group
jkacd-34-113-t5.tif
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