title: Comparison of silorane and methacrylate-based composites on the polymerization heat generated with different light-curing units and dentin thicknesses.
abstract: This study evaluated the temperature variation in the pulp chamber during photoactivation of two restorative composite resins (Filtek P90 silorane-based composite and Heliomolar methacrylate-based composite) with either a quartz-tungsten-halogen (QTH) or light-emitting diodes (LED) light-curing unit (LCU) and using dentin thicknesses (0.5 and 1.0 mm). Standardized cavities (2x2x2 mm) were prepared in 80 bovine incisors, which were randomly assigned to 8 groups according to the photoactivation method and dentin thickness. Filtek P90 and Heliomolar (both in shade A3) were used with their respective adhesive systems (P90 self-etch primer / P90 adhesive bond and Excite adhesive). All experiments were carried out in a controlled environment (37°C). The temperature variations (°C) were recorded using a digital thermometer attached to a K-type thermocouple. The results were analyzed statistically by ANOVA and Tukey's test (α=0.05). For composite/dentin thickness interaction, temperature increase was significantly higher in 0.5 mm dentin thickness (40.07°C) compared with 1.0 mm dentin thickness (39.61°C) for Filtek P90. For composite/LCU interaction, the temperature increase was significantly higher for Filtek P90 (39.21°C - QTH and 40.47°C - LED) compared with Heliomolar (38.40°C - QTH and 39.30°C - LED). The silorane-based composite promoted higher temperature increase in the pulp chamber than the methacrylate-based composite.
authors: Department of Restorative Dentistry, Dental School, University of North of Paraná, Rua Marselha 183, Londrina, PR, Brazil. rdguiraldo@gmail.com
authors: Ricardo Danil
authors: RD
authors: Guiraldo
authors: Simonides
authors: S
authors: Consani
authors: Rafael Leonardo Xediek
authors: RL
authors: Consani
authors: Sandrine Bittencourt
authors: SB
authors: Berger
authors: Américo Bortolazzo
authors: AB
authors: Correr
authors: Mário Alexandre Coelho
authors: MA
authors: Sinhoreti
authors: Lourenço
authors: L
authors: Correr-Sobrinho
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001831:Body Temperature / Q000502:physiology; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification*; D003737:Dental Cavity Preparation / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000502:physiology; D003804:Dentin / Q000648:ultrastructure*; D006358:Hot Temperature; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D058105:Polymerization; D011140:Polyurethanes / Q000737:chemistry*; D011897:Random Allocation; D062047:Silorane Resins / Q000737:chemistry*; D013821:Thermometers
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; C420130:Excite cement; C513708:Heliomolar; D008689:Methacrylates; D011140:Polyurethanes; D062047:Silorane Resins; C544925:filtek P90; C555513:silorane composite resin; C029824:urethane dimethacrylate luting resin; D017438:Bisphenol A-Glycidyl Methacrylate