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CC BY-NC-ND 4.0 · Eur J Dent 2010; 04(03): 314-323
DOI: 10.1055/s-0039-1697845
Original Article
European Journal of Dentistry

Influence of Curing Light Attenuation Caused by Aesthetic Indirect Restorative Materials on Resin Cement Polymerization

Bárbara Pick
a   Department of Dental Materials, University of São Paulo, Brazil
,
Carla Castiglia Gonzaga
b   Masters Program in Clinical Dentistry, Positivo University, Brazil
,
Washington Steagall Junior
c   Department of Restorative Dentistry, University of São Paulo, Brazil
,
Yoshio Kawano
d   Chemical Institute, University of São Paulo, Brazil
,
Roberto Ruggiero Braga
a   Department of Dental Materials, University of São Paulo, Brazil
,
Paulo Eduardo Capel Cardoso
a   Department of Dental Materials, University of São Paulo, Brazil
› Author Affiliations
Further Information

Publication History

Publication Date:
30 September 2019 (online)

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Objectives: To verify the effect of interposing different indirect restorative materials on degree of conversion (DC), hardness, and flexural strength of a dual-cure resin cement.

Methods: Discs (2 mm-thick, n=5) of four indirect restorative materials were manufactured: a layered glass-ceramic (GC); a heat-pressed lithium disilicate-based glass-ceramic veneered with the layered glass-ceramic (LD); a micro-hybrid (MH); and a micro-filled (MF) indirect composite resin. The light transmittance of these materials was determined using a double-beam spectrophotometer with an integrating sphere. Bar-shaped specimens of a dual-cure resin cement (Nexus 2/SDS Kerr), with (dual-cure mode) and without the catalyst paste (light-cure mode), were photoactivated through the discs using either a quartz-tungsten-halogen (QTH) or a light-emitting diode (LED) unit. As a control, specimens were photoactivated without the interposed discs. Specimens were stored at 37ºC for 24h before being submitted to FT-Raman spectrometry (n=3), Knoop microhardness (n=6) and threepoint bending (n=6) tests. Data were analyzed by ANOVA/Tukey’s test (α=0.05).

Results: MH presented the highest transmittance. The DC was lower in light-cure mode than in dual-cure mode. All restorative materials reduced the cement microhardness in light-cure mode. GC and LD with QTH and GC with LED decreased the strength of the cement for both activation modes compared to the controls. Curing units did not affect DC or microhardness, except when the dualcure cement was photoactivated through LD (LED>QTH). Flexural strength was higher with QTH compared to LED.

Conclusions: Differences in transmittance among the restorative materials significantly influenced cement DC and flexural strength, regardless of the activation mode, as well as the microhardness of the resin cement tested in light-cure mode. Microhardness was not impaired by the interposed materials when the resin cement was used in dual-cure mode. (Eur J Dent 2010;4:314-323)

Keywords

Light transmission - Resin cement - Degree of conversion - Microhardness - Flexural strength
 

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