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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
November/December 2009
Volume 40 , Issue 10

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Effects of Temperature on Composite Resin Shrinkage

Ricardo Walter, DDS, MS/Edward J. Swift Jr, DMD, MS/Huma Sheikh, DDS/Jack L. Ferracane, PhD

Pages: 843847
PMID: 19898716

Objective: To determine whether temperature affects the polymerization shrinkage of composite resin. Method and Materials: Volumetric shrinkage of a microfill composite was measured using a video-imaging device. The material was cooled to 4C or heated to 37C, 54C, or 68C. Room-temperature (20C) composite was used as the control. The composite was light activated using a quartz-tungsten-halogen curing device. Polymerization shrinkage was recorded at 1-minute intervals for 10 minutes after the beginning of photoinitiation. The data were subjected to ANOVA, Fishers PLSD test, and linear regression analysis (a = 0.05). Results: Volumetric shrinkage ranged from 0.2% to 4.7%. Shrinkage of the composite at 37C was similar to that at room temperature. Preheating the composite to 54C or 68C significantly increased shrinkage. The apparent polymerization shrinkage of the refrigerated composite was significantly less than that of the control, although this might have been an artifact of the test method. Regression analysis revealed a strong correlation between temperature and volumetric shrinkage. Conclusion: Preheating composite to relatively high temperatures (54C or 68C) to increase its flow and adaptation causes an increase in volumetric shrinkage. At body temperature, composite shrinkage is similar to that at room temperature. (Quintessence Int 2009;40:843847)

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