Halogen and LED light curing of composite: temperature increase and Knoop hardness.

Abstract:

:This study assessed the Knoop hardness and temperature increase provided by three light curing units when using (1) the manufacturers' recommended times of photo-activation and (2) standardizing total energy density. One halogen--XL2500 (3M/ESPE)--and two light-emitting diode (LED) curing units--Freelight (3M/ESPE) and Ultrablue IS (DMC)--were used. A type-K thermocouple registered the temperature change produced by the composite photo-activation in a mold. Twenty-four hours after the photo-activation procedures, the composite specimens were submitted to a hardness test. Both temperature increase and hardness data were submitted to ANOVA and Tukey's test (5% significance). Using the first set of photo-activation conditions, the halogen unit produced a statistically higher temperature increase than did both LED units, and the Freelight LED resulted in a lower hardness than did the other curing units. When applying the second set of photo-activation conditions, the two LED units produced statistically greater temperature increase than did the halogen unit, whereas there were no statistical differences in hardness among the curing units.

journal_name

Clin Oral Investig

authors

Schneider LF,Consani S,Correr-Sobrinho L,Correr AB,Sinhoreti MA

doi

10.1007/s00784-005-0028-x

keywords:

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

66-71

issue

1

eissn

1432-6981

issn

1436-3771

journal_volume

10

pub_type

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