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KMID : 0370819940090010069
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Yonsei Journal Dental Science
1994 Volume.9 No. 1 p.69 ~ p.75
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Degree of Conversion in heat cured Composite
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Abstract
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This study was designed to determine the changes in the degree of conversion for composite resin after heat curing and to evaluate whether or not the thin film technique as modified y the author was sensitive to changes in distance from the light
source. A 10-mm diameter hole was made in a 30×20×1mm teflon plate and a mylar strip was positioned along one side of the hole using adhesive tape.
Using this method, four teflon molds were made. Composite resin was placed in the teflon molds, and the four molds were stacked on top of each other. The samples were divided into groups A, B, C, and D according to distance form the light source.
After
light curing, the samples were separated from the molds. Using this method, 10 samples were prepared in each group ; 5 samples form each group were heat cured. These samples were then thinned to 50-70 ㎛and analyzed with a Fourier Tramsform
Infrared
Spectrometer. A standard baseline technique was used to calculate the degree of conversion. The degree of conversion diminished as the distance from the light source increased ; however, once they were heat cured inlay oven, all samples reached
72.7% of
conversion. The modified thin film technique with FT-IR spectromenter is considered to be a reliable method for measuring the degree of conversion in a composite resin because changes between groups were clearly noted.
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