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Properties of a new photo‐activated composite polymerized with three different laboratory photo‐curing units
Author(s) -
Tanoue N.,
Atsuta M.,
Matsumura H.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01142.x
Subject(s) - knoop hardness test , curing (chemistry) , halide , materials science , halogen lamp , solubility , composite material , composite number , polymerization , chemistry , indentation hardness , microstructure , polymer , organic chemistry , optics , physics
summary This study determined the hardness, solubility and curing depth of a new photo‐activated composite polymerized with three different laboratory photo‐curing units for the purpose of evaluating the post‐curing properties of the material. A new photo‐activated composite material for both direct and indirect applications (DiamondCrown TM ) was polymerized with three photo‐curing units equipped with the following light sources: (i) two halogen lamps (DiamondLite‐VLTM. Halogen Light Curing Booth); (ii) two metal halide lamps (Hyper LII) and (iii) two xenon stroboscopic tubes (UniXS II). Knoop hardness, water solubility and curing depth were determined for groups of five specimens according to standardized testing methods. All data were compared using analysis of variance ( anova ) and Scheffe's S intervals ( P < 0·05). The Knoop hardness number (KHN) generated with the metal halide unit (63·3 ± 2·4 KHN) was statistically ( P < 0·05) greater than those produced by the other two curing units. Water solubility values for both the halogen unit (2·5 ± 0·5 μg mm −3 ) and the metal halide unit (2·5 ± 0·5 μg mm −3 ) were significantly ( P < 0·05) lower than for the xenon unit (3·8 ± 0·5 μg mm −3 ). Of the three photo‐curing units, the metal halide curing‐unit consistently exhibited the greatest depth of cure. The composite material appears to be reliable, although its post‐curing properties were found to be influenced by the type of curing unit.