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Journal of Dental Research
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Effects of Backing Reflectance and Mold Size on Polymerization of Photo-activated Composite Resin

P.L. Fan

Council on Dental Materials, Instruments and Equipment, American Dental Association, Chicago, Illinois 60611

C.M. Stanford

Council on Dental Materials, Instruments and Equipment, American Dental Association, Chicago, Illinois 60611

W.B. Stanford

Council on Dental Materials, Instruments and Equipment, American Dental Association, Chicago, Illinois 60611

R. Leung

Department of Restorative Dentistry, School of Dentistry, University of Southern California, Los Angeles, California 90089-0641

J.W. Stanford

Council on Dental Materials, Instruments and Equipment, American Dental Association, Chicago, Illinois 60611

The in vitro depth of cure of a visible-light-activated microfilled composite, as influenced by backing reflectance and mold size, was investigated using microhardness measurements. More extensive polymerization was obtained with higher values of backing reflectance. Mold size larger than the cross-sectional area of the photo-activating beam also increased the degree of polymerization. Backing reflectance and mold size are influential factors and need to be defined in depth-of cure evaluations if in vitro measurements are to be valid predictors of clinical performance.

Journal of Dental Research, Vol. 63, No. 10, 1245-1247 (1984)
DOI: 10.1177/00220345840630101601
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F.A. Rueggeberg and R.G. Craig
Correlation of Parameters used to Estimate Monomer Conversion in a Light-cured Composite
Journal of Dental Research, June 1, 1988; 67(6): 932 - 937.
[Abstract] [PDF]