N. Tanoue et al., CURING DEPTH OF A COMPOSITE VENEERING MATERIAL POLYMERIZED WITH 7 DIFFERENT LABORATORY PHOTO-CURING UNITS, Journal of oral rehabilitation, 25(3), 1998, pp. 199-203
Properties of laboratory-cured composite materials are affected by the
type of activation system as well as by the photo-curing unit light s
ource. This study examined curing depth of a composite veneering mater
ial polymerized by means of various photo-curing units with the aim of
evaluating the curing performance of the light sources. A microfilled
composite material designed for prosthetic veneer was cured with seve
n photo-curing units. The light sources of the units were halogen/fluo
rescent, xenon, metal halide, fluorescent, halogen, halogen and mercur
y lamps. Exposure periods were 20, 30, 60 and 90 s. The curing depth o
f the material was determined using the method described by the Intern
ational Organization for Standardization (ISO 4049). Two-factor analys
is of variance revealed that the depth of cure was influenced both by
the type of curing unit and by the exposure period (P = 0.0001). Among
the seven photo-curing units, a metal halide curing unit consistently
exhibited the greatest depth of cure. For all units, longer exposure
increased the depth of cure.