Nadia Malek Taher.
The effect of different light-curing methods on temperature change of two types of resin-luting cements.
J Pak Dent Assoc Jan ;15(2):80-4.

OBJECTIVE: The purpose of this study was to investigate the temperature rise of two resin-based luting cements when photo-activated with three light-curing units. MATERIALS AND METHODS: Sixty cylindrical discs (5mmx2mm) from Z-250 were fabricated. The two resin-based luting cements (Choice, Bisco and Bi-fix, Voco) were polymerized with three different light curing units (halogen light curing unit, light emitting diodes curing unit and plasma arc curing unit). A type-K-thermocouple registered the temperature rise peak in an elastomer mold (5mmx2.5mm) during photo-activation. Composite resin disc was placed on top of resin luting cement discs (5mmx0.5mm) and curing light was passed through composite discs to cure cement specimens. RESULTS: The temperature change data were submitted to ANOVA and Tukey`s test at the 5% significance level. There was statistically significant difference in temperature rise recorded for the two resin-luting cement following polymerization by different light curing units. The light emitting diodes source produced statistically highest temperatures (p<0.05) than the other units. The plasma arc source promoted statistically the lowest (p<0.05) temperature with both luting resins than other curing lights units. CONCLUSION: Special care should be taken when LED Lai is used to avoid any damage to the surrounding tissues for rise in temperature.

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