Influence of curing rate on softening in ethanol, degree of conversion, and wear of resin composite

Benetti, Ana Raquel; Peutzfeldt, Anne; Asmussen, Erik; Pallesen, Ulla; Franco, Eduardo Batista (2011). Influence of curing rate on softening in ethanol, degree of conversion, and wear of resin composite. American journal of dentistry, 24(2), pp. 115-8. Cordova, Tenn.: Mosher & Linder

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PURPOSE: To investigate the effect of curing rate on softening in ethanol, degree of conversion, and wear of resin composites. METHOD: With a given energy density and for each of two different light-curing units (QTH or LED), the curing rate was reduced by modulating the curing mode. Thus, the irradiation of resin composite specimens (Filtek Z250, Tetric Ceram, Esthet-X) was performed in a continuous curing mode and in a pulse-delay curing mode. Wallace hardness was used to determine the softening of resin composite after storage in ethanol. Degree of conversion was determined by infrared spectroscopy (FTIR). Wear was assessed by a three-body test. Data were submitted to Levene's test, one and three-way ANOVA, and Tukey HSD test (alpha = 0.05). Results: Immersion in ethanol, curing mode, and material all had significant effects on Wallace hardness. After ethanol storage, resin composites exposed to the pulse-delay curing mode were softer than resin composites exposed to continuous cure (P< 0.0001). Tetric Ceram was the softest material followed by Esthet-X and Filtek Z250 (P< 0.001). Only the restorative material had a significant effect on degree of conversion (P< 0.001): Esthet-X had the lowest degree of conversion followed by Filtek Z250 and Tetric Ceram. Curing mode (P= 0.007) and material (P< 0.001) had significant effect on wear. Higher wear resulted from the pulse-delay curing mode when compared to continuous curing, and Filtek Z250 showed the lowest wear followed by Esthet-X and Tetric Ceram.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

Peutzfeldt, Anne

ISSN:

0894-8275

Publisher:

Mosher & Linder

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

04 Oct 2013 14:16

Last Modified:

25 Jan 2017 12:16

PubMed ID:

21698992

Web of Science ID:

000291236700009

URI:

https://boris.unibe.ch/id/eprint/4407 (FactScience: 208605)

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