The attenuation of radiation by porcelain and its effect on polymerization of resin cements.
The influence of porcelain thickness and opacity on the polymerization of two dual activated (microfine and hybrid) and one light irradiated (hybrid) resin cements was assessed by hardness measurements. The surface microhardness values of the upper and lower surface of 1 mm thick resin cement specimens were determined. Specimens were polymerized using 40s irradiation beneath different thicknesses and opacities of porcelain discs. The results showed that increasing the thicknesses and opacity of the porcelain produced a statistically significant decrease in microhardness of the resin-based cements. The effect of attenuation is less for the microfine cement than for the hybrids. In the case of hybrid cements, the light activated material performed better than the dual activated cement.
School of Dentistry, University of Birmingham, U.K.
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S
Uctasli
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Hasanreisoglu
H J
HJ
Wilson
D000180:Acrylic Resins / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006244:Hardness / Q000528:radiation effects; D008027:Light; D008689:Methacrylates / Q000737:chemistry; D010316:Particle Size; D011140:Polyurethanes / Q000737:chemistry
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D003738:Dental Cements; D008689:Methacrylates; D011140:Polyurethanes; C077601:Porcelite Dual Cure; D003776:Dental Porcelain; C029824:urethane dimethacrylate luting resin; C077600:Porcelite