title: Temperature rise during adhesive and composite polymerization with different light-curing sources.
abstract: OBJECTIVE
  This study evaluated the temperature rise of the adhesive system Single Bond (SB) and the composite resins Filtek Z350 flow (Z) and Filtek Supreme (S), when polymerized by light-emitting diode (LED XL 3000) and quartz-tungsten halogen (QTH Biolux).
  
  
  METHODS
  Class V cavities (3 yen2 mm) were prepared in 80 bovine incisors under standardized conditions. The patients were divided as follows: G1: Control; G2: SB; G3: SB + Z; G4: SB + S. The groups were subdivided into two groups for polymerization (A: QTH, B: LED). Light curing was performed for 40 s and measurement of temperature changes during polymerization was performed with a thermocouple positioned inside the pulp chamber. Data were statistically analyzed using ANOVA and Tukey tests.
  
  
  RESULTS
  The factors material (P<0.00001) and curing unit (P<0.00001) had significant influence on temperature rise. The lowest temperature increase (0.15 degrees C) was recorded in G2 B and the highest was induced in G1 A (0.75 degrees C, P<0.05). In all groups, lower pulp chamber temperature measurements were obtained when using LED compared to QTH (P<0.05).
  
  
  CONCLUSIONS
  QTH caused greater increases in tooth temperature than LED. However, both sources did not increase pulpal temperature above the critical value that may cause pulpal damage.
authors.affiliation: Department of Restorative Dentistry, UNESP, São Paulo State University, São José dos Campos, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Pereira Da Silva
authors.forename: L
authors.initials: L
authors.lastname: Alves Da Cunha
authors.forename: C
authors.initials: C
authors.lastname: Pagani
authors.forename: S
authors.initials: S
authors.lastname: De Mello Rode
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D055117:Curing Lights, Dental; D055115:Light-Curing of Dental Adhesives; D011108:Polymers; D013696:Temperature
chemical_list: D003188:Composite Resins; D011108:Polymers