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THE EFFECT OF OXYGEN INHIBITION ON INTERFACIAL BONDING BETWEEN COMPOSITE RESIN LAYERS  

Choi, Su-Mi (Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University)
Park, Jae-Hong (Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University)
Choi, Sung-Chul (Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University)
Kim, Kwang-Chul (Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University)
Choi, Young-Chul (Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University)
Publication Information
Journal of the korean academy of Pediatric Dentistry / v.37, no.3, 2010 , pp. 298-307 More about this Journal
Abstract
The purpose of this study was to assess the effect on oxygen inhibition layer(OIL) for the interfacial bonding between resin composite layers, including shear bond strength, fracture modes and degree of conversion. The first layer of specimen was filled with Z-250(shade A3) and was cured for 40s. The second layer of specimen was filled with same composite(shade A1) and was cured for 40s. The first layer of specimens for each group were prepared by methods as followings. Control(curing in atmospheric air), Group1(curing against Mylar strip), Group2(scrubbed with a acetone-soaked cotton), Group3(using Tescera light cup), Group4(using Tescera heat cup), Group5(stored in disti1led water for 30days at $37^{\circ}C$), Group6 (using bonding agent). The results were as follows: 1. There was no statistically significant different shear bond strength between control and group 1(p>0.05). 2. Group 2 showed significantly lower shear bond strength than control and group 1(p<0.05). 3. The observation of the fracture surface leads to the evidence that a major difference occurs in the case of control, group1 and group 3 samples which break mainly cohesively while the other groups break in majority adhesively. 4. The results of FTIR showed that the degree of conversion was the highest in group 2 and the lowest in control group(p<0.05). It can be concluded that an OIL is not necessary for bonding with composite resin. But if a reduced critical amount of the unreacted monomer is present, it was detrimental to bonding additional layers of composite. Further study, such as the quantitative analysis of the unreacted monomer are required.
Keywords
Oxygen inhibition layer(OIL); Unreacted monomer; Composite; Degree of conversion; Interfacial bonding;
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Times Cited By KSCI : 5  (Citation Analysis)
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