Effect of Light-Curing Method and Cement Activation Mode on Resin Cement Knoop Hardness

Authors: Tango, Rubens Nisie¹; Sinhoreti, Mário Alexandre Coelho²; Correr, Américo Bortolazzo¹; Correr-Sobrinho, Lourenço²; Henriques, Guilherme Elias Peçanha³

Source: Journal of Prosthodontics, Volume 16, Number 6, November/December 2007 , pp. 480-484(5)

Publisher: Wiley-Blackwell

Abstract:

Purpose: To evaluate the Knoop hardness (KHN) of the resin cement Enforce activated by chemical/physical mode or physical mode solely; light-cured directly or through a 1.5 mm thick ceramic disc (HeraCeram) on shade DD2.

Materials and Methods: Light-curing was carried out using a conventional quartz tungsten halogen light (QTH) (XL2500) for 40 seconds at 700 mW/cm²; light-emitting diodes (LED) (Ultrablue Is) for 40 seconds at 440 mW/cm²; and Xenon plasma arc (PAC) (Apollo 95E) for 3 seconds at 1600 mW/cm². Bovine incisors had their buccal faces flattened and hybridized. A mold was seated on these surfaces and filled with cement. A disc of the acid-etched and silanized veneering material was seated over this set for light-curing. After dry storage (24 hours at 37°C), specimens (n= 10) were sectioned for KHN measurements performed in a microhardness tester (50 gf load for 15 seconds). Data were submitted to ANOVA and Tukey's test (α= 0.05).

Results: The highest KHN values were obtained with LED, for both dual-cured and light-cured cement. The lowest KHN value was obtained with light-cured PAC. Light-curing with QTH resulted in hardness values similar to PAC in dual-cured groups.

Conclusions: Light-curing through HeraCeram can influence resin cement hardness.

J Prosthodont 2007;16:480-484. Copyright © 2007 by The American College of Prosthodontists. 

Keywords: resin-based cement; resin composite; ceramic; light transmission

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1532-849X.2007.00234.x

Affiliations: 1: Graduate Student, Department of Restorative Dentistry. 2: Titular Professor, Department of Restorative Dentistry. 3: Titular Professor, Department of Prosthodentics.

Publication date: 2007-11-01

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