Original scientific paper
Correlation Between Degree of Conversion and Light Transmission Through Resin Composite Samples
Zrinka Tarle
; Department of Restorative Dentistry, School of Dentistry, University of Zagreb, Croatia
Andreja Meniga
; Department of Restorative Dentistry, School of Dentistry, University of Zagreb, Croatia
Jozo Šutalo
; Department of Restorative Dentistry, School of Dentistry, University of Zagreb, Croatia
Abstract
Quantitative analysis of residual double bonds or free radicals in the polymer network is the most reliable method for determining the degree of conversion. In this study, measurements of the degree of conversion and light transmission of three different composite resin materials and two different shades (the lightest and the darkest shades) were evaluated. The correlation between the measurements of the degree of conversion and light transmission was observed. Absorption and scattering by filler particles would continue the light attenuation through a composite resin specimen and consequentially reduce the degree of conversion. There is a dependence on the amount of filler loading and composite resin shade. The results confirmed the hybrid materials and lighter shades to provide higher conversion than the microfilled composite resins as well as darker and more opaque shade. It was also found that illumination by a curing unit of low output (230 mW/cm2) should be prolonged and gradual
increments should not exceed one mm.
Keywords
composite resins; degree of conversion; light transmission
Hrčak ID:
99092
URI
Publication date:
15.3.1995.
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