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- Original Article The effect of cyanate methacrylate on the shear bond strengths to dentin
- Hyang-Kyung Kim, Kyung-Kyu Choi, Gi-Woon Choi, Sang-Jin Park
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2007;32(3):-247.
DOI: https://doi.org/10.5395/JKACD.2007.32.3.236
Published online: May 31, 2007
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- Corresponding Author: Sang-Jin Park. Department of Conservative Dentistry, Division of Dentistry, Graduate of Kyung Hee University, 1, Hoegi Dong, Dongdaemun Gu, Seoul, Korea, 130-702. Tel: 82-2-958-9335, psangjin@khu.ac.kr
• Received: March 21, 2007 • Revised: April 24, 2007 • Accepted: April 30, 2007
Copyright © 2007 Korean Academy of Conservative Dentistry
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Abstract
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The purpose of this study was to evaluate the effects of cyanate methacylate on the shear bond strengths to bovine dentin surfaces as a dentin primers.Seven experimental adhesives were made with different mass fraction of Isocyanatoetylmethacrylate (IEM), 40wt% HEMA (Wako Pure Chemical Industries Osaka, Japan), 0.6% camphoroquinone, 0.4% amine and ethanol as balance. dentin bonding agents (0, 2, 4, 6, 8, 10, 12%) were made and applied on the surface of bovine dentin specimens of 7 experimental groups.Shear bond strengths were measured using a universal testing machine (Instro 4466).To identify the ratio and modes of cohesive failures, microscopic examinationn was performed. The ultra-structure of resin tags were observed under scanning electron microscope.The results were as follows ;1) A higher shear bond strengths (33.62 MPa) in group 8% of Cyanate methacrylate to dentin were found, but there were no statistically significancy between Groups (p > 0.05).2) The higher ratio of cohesive failures mode in group 2, 6, an 10% could be seen than that in any other groups.3) A shorter resin tags were observed in all experimental groups.This could be resulted that the preventing from the cyanate methacrylate penetrate into dentin owing to reacting it with dentin collagen.Therefore the resin tags were shorter in lengths.Whether the higher bonding strengths of dentin bonding agents can be affected was not been assured with statistic results.The results indicated that the relation between tensile strengths of the dentin adhesives to bovine dentin and resin tags formed into the dentin could not affected.The main reason of increasing the shear bond strength to bovine dentin in experimental groups could not be assured.
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REFERENCES
Figure 4
Scanning electron micrograph of resin tags : (a) group 0, (b) group 2, (c) group 4, (d) group 6, (e) group 8, (f) group 10, (g) group 12, × 800 ; Great bundle of resin tags are shown in group 0 to group 6, which are similar patterns but resin infiltration is limited in group 10 and 12.
Tables & Figures
REFERENCES
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Figure 1
Shear bond strengths between seven experimental groups.
Figure 2
Result of linear regression analysis in seven experimental groups in shear bond strengths.
Figure 3
Cohesive fracture ratio of seven experimental groups.
Figure 4
Scanning electron micrograph of resin tags : (a) group 0, (b) group 2, (c) group 4, (d) group 6, (e) group 8, (f) group 10, (g) group 12, × 800 ; Great bundle of resin tags are shown in group 0 to group 6, which are similar patterns but resin infiltration is limited in group 10 and 12.
Figure 5
Scanning electron micrograph showing the resin tags, × 2,000 (a) group 0; a great number of resin tags are intangled and cross-linked each other (b) group 12; resin tags are blunt and shortened. some of canaliculi are shown between tags.
Figure 6
Scanning electron micrograph showing the hybrid layers in group 0% and 12%. × 3,000.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
The effect of cyanate methacrylate on the shear bond strengths to dentin
Materials and chemical characteristics of experimental bonding agents used in this study
Experiment groups by dentin bonding agents used in this study (unit : weight %)
Shear bond strengths (kPa) and cohesive failure modes in seven experimental groups
※ Duncan's Group means that there is no statistical differences between groups marked with same letter.
Table 1
Materials and chemical characteristics of experimental bonding agents used in this study
Table 2
Experiment groups by dentin bonding agents used in this study (unit : weight %)
Table 3
Shear bond strengths (kPa) and cohesive failure modes in seven experimental groups
※ Duncan's Group means that there is no statistical differences between groups marked with same letter.
