Temperature rise during adhesive and composite polymerization with different light-curing sources.
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.
Pereira Da Silva
A
A
Department of Restorative Dentistry, UNESP, São Paulo State University, São José dos Campos, Brazil.
Alves Da Cunha
L
L
Pagani
C
C
De Mello Rode
S
S
D000818:Animals; D002417:Cattle; D003188:Composite Resins; D055117:Curing Lights, Dental; D055115:Light-Curing of Dental Adhesives; D011108:Polymers; D013696:Temperature
D003188:Composite Resins; D011108:Polymers