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Kim and Cho: Microshear bond strength of a flowable resin to enamel according to the different adhesive systems
Basic Research
Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2011; 36(1): 50-58.

Published online: 31 January 2011

DOI: https://doi.org/10.5395/JKACD.2011.36.1.50

Microshear bond strength of a flowable resin to enamel according to the different adhesive systems

Jeong-Ho Kim, DDS, PhD, Young-Gon Cho, DDS, MSD, PhD

Graduate student

Professor

Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea.

Correspondence to Young-Gon Cho, DDS, MSD, PhD. Professor, Department of Conservative Dentistry, Chosun University School of Dentistry, 421 Seosuk-dong Dong-gu, Gwangju, Korea 501-825. TEL, +82-62-220-3845; FAX, +82-62-220-223-9064; ygcho@mail.chosun.ac.kr

Received 25 October 2010       Revised 11 November 2010       Accepted 4 December 2010

Copyright © 2011 Korean Academy of Conservative Dentistry

Abstract

Objectives

The purpose of this study was to compare the microshear bond strength (uSBS) of two total-etch and four self-etch adhesive systems and a flowable resin to enamel.

Materials and Methods

Enamels of sixty human molars were used. They were divided into one of six equal groups (n = 10) by adhesives used; OS group (One-Step Plus), SB group (Single Bond), CE group (Clearfil SE Bond), TY group (Tyrian SPE/One-Step Plus), AP group (Adper Prompt L-Pop) and GB group (G-Bond).
After enamel surfaces were treated with six adhesive systems, a flowable composite resin (Filek Z 350) was bonded to enamel surface using Tygon tubes. the bonded specimens were subjected to uSBS testing and the failure modes of each group were observed under FE-SEM.

Results

1. The uSBS of SB group was statistically higher than that of all other groups, and the uSBS of OS, SE and AP group was statistically higher than that of TY and GB group (p < 0.05).
2. The uSBS for TY group was statistically higher than that for GB group (p < 0.05).
3. Adhesive failures in TY and GB group and mixed failures in SB group and SE group were often analysed. One cohesive failure was observed in OS, SB, SE and AP group, respectively.

Conclusions

Although adhesives using the same step were applied the enamel surface, the uSBS of a flowable resin to enamel was different.

Keywords: Adhesive systems, Enamel, Failure modes, Flowable resin, Microshear bond strength

Figures and Tables

Figure 1
Representative adhesive failure to enamel surface in OS group (×110).
jkacd-36-50-g001
Figure 2
Representative mixed failure to enamel surface in SB group (×110).
jkacd-36-50-g002
Figure 3
Representative mixed failure to enamel surface in SE group (×100).
jkacd-36-50-g003
Figure 4
Representative adhesive failure to enamel surface in TY group (×110).
jkacd-36-50-g004
Figure 5
Representative mixed failure to enamel surface in AP group (×120).
jkacd-36-50-g005
Figure 6
Representative adhesive failure to enamel surface in GB group (×130).
jkacd-36-50-g006
Table 1
Composition and pH of adhesive systems
jkacd-36-50-i001

BPDM, bisphenyldimethacrylate; HEMA, hydroxyethylmethacrylate; Bis-GMA, bisphenol-glycidyl methacrylate; DMA, dimethacrylate; 10-MDP, 10-Methacryloyloxydecyl dihydrogen phosphate; CP, camphoroquinone; 4-MET, 4-methacryloxyethyl trimellitate; UDMA, urethane dimethacrylate.

Table 2
Group classification and adhesive systems
jkacd-36-50-i002
Table 3
Microshear bond strength (MPa) and failure mode analysis of each group
jkacd-36-50-i003

Different letters (a,b,c,d) indicate statistically significant difference between groups at p=0.05 (by Tukey HSD).

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