Polymerization contraction of resin composite vs. energy and power density of light-cure.

Abstract:

:This study measured the polymerization contraction of a resin composite cured at three levels of energy density, each attained at six different levels of power density. The polymerization contraction of the composite was recorded by the method of the deflecting disc (n = 5) for 1 h following the start of irradiation. Power densities of 50, 100, 200, 400, 800 and 1,000 mW cm(-2), as measured on a dental radiometer, were obtained by variation of distance and supply voltage of a commercial light-curing unit. The spectral distribution at each power density was recorded using a spectrophotometer. The absorption spectrum of camphorquinone was also recorded, and the efficiency of the radiation at each power density was calculated as the integral over wavelength of the product of absorption and emission. From the slope of the contraction curves, an approximation to the initial rate of polymerization, Rp, was calculated and was taken as an alternative measure of power density. Statistical analyses showed that polymerization contraction increased significantly with increasing levels of energy density received by the resin composite, and, for each level of energy density, that the contraction decreased significantly with increasing power density.

journal_name

Eur J Oral Sci

authors

Asmussen E,Peutzfeldt A

doi

10.1111/j.1600-0722.2005.00239.x

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

417-21

issue

5

eissn

0909-8836

issn

1600-0722

pii

EOS239

journal_volume

113

pub_type

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