Heat generated during light-curing of restorative composites

Effect of curing light, exotherm, and experiment substrate

Amy Balestrino, Crisnicaw Veríssimo, Daranee Versluis, Franklin Garcia-Godoy, Carlos J. Soares, Antheunis Versluis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Purpose: To investigate temperature rise, separating heat caused by irradiation and exotherm for three composites polymerized with three curing lights. The effect of substrate on temperature measurements was also determined. Methods: Composite samples (n= 5) (Filtek Supreme Ultra, Filtek LS, and EsthetX HD) were placed on a thermocouple tip inside three substrates (aluminum, Delrin, and tooth). The composites were photoactivated using three curing lights (Elipar 2500 QTH, SmartLite Max LED, DemiUltra LED) at 1 mm distance. Irradiance was 798, 980, and 1,135 mW/cm2, respectively. Exotherm was determined by subtracting post-cure from the polymerization temperature curves. ANOVA and Student-Newman-Keuls post-hoc tests were used to analyze differences among peak temperatures and exotherms (significance level 0.05). Results: SmartLite LED curing light resulted in higher peak temperatures and exotherms compared to the DemiUltra LED and QTH for all tested composites (16.9-20.4°C vs 12.3-14.7°C vs 8.9-9.7°C). Thus, the LEDs produced higher temperature rises than the QTH, and the LED with lower irradiance caused higher temperature rise than the LED with higher irradiance. The silorane-based Filtek LS generated significantly higher exotherm than the methacrylate-based EsthetX HD and Filtek Supreme Ultra (6.2-7.6°C vs 3.6-4.5°C vs 2.7-3.6°C). Substrate affected temperatures significantly. Temperature profiles found in Delrin substrate were comparable to tooth substrate, while aluminum substrate reduced temperatures 10-20 degrees.

Original languageEnglish (US)
Pages (from-to)234-240
Number of pages7
JournalAmerican Journal of Dentistry
Volume29
Issue number4
StatePublished - Aug 1 2016

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Hot Temperature
Light
Temperature
Aluminum
Tooth
Methacrylates
Polymerization
Analysis of Variance
Students

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Heat generated during light-curing of restorative composites : Effect of curing light, exotherm, and experiment substrate. / Balestrino, Amy; Veríssimo, Crisnicaw; Versluis, Daranee; Garcia-Godoy, Franklin; Soares, Carlos J.; Versluis, Antheunis.

In: American Journal of Dentistry, Vol. 29, No. 4, 01.08.2016, p. 234-240.

Research output: Contribution to journalArticle

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