Influence of different ceramics on resin cement Knoop Hardness Number

G. A. Borges, P. Agarwal, B. A S Miranzi, Jeffrey Platt, T. A. Valentino, P. H. Santos

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This study evaluated: 1) the effect of different ceramics on light attenuation that could affect microhardness, measured as the Knoop Hardness Number (KHN), of a resin cement immediately and 24 hours after polymerization and 2) the effect of different activation modes (direct light-activation, light activation through ceramics and chemical activation) on the KHN of a resin cement. Resin cement Rely X ARC (3M ESPE) specimens 5.0 nun in diameter and 1.0 mm thick were made in a Teflon mold covered with a polyester film. The cement was directly light activated for 40 seconds with an XL 2500 curing unit (3M ESPE) with 650 mW/cm2, light activated through ceramic discs of Duceram Plus (DeguDent), Cergogold (DeguDent), IPS Empress (Ivoclar), IPS Empress 2 (Ivoclar), Procera (NobelBiocare), In Ceram Alumina (Vita) and Cercon (DeguDent), having a 1.2 mm thickness or chemically activated without light application. The resin cement specimens were flattened, and KHN was obtained using an HMV 2 microhardness tester (Shimadzu) with a load of 50 g applied for 15 seconds 100 μm from the irradiated sin-face immediately and after storage at 37°C for 24 hours. Ten measurements were made for each specimen, with three specimens for each group at each time. The data were submitted to ANOVA and Tukey's test (p=0.05). The KHN of the resin cement was not only affected by the mode of activation, but also by the post-activation testing time. The mean KHN of the resin cement for chemical activation and through all ceramics showed statistically significant lower values compared to direct activation immediately and at 24 hours. The KHN for 24 hours post-activation was always superior to the immediate post-activation test except with direct activation. The most opaque ceramics resulted in the lowest KHN values.

Original languageEnglish (US)
Pages (from-to)622-628
Number of pages7
JournalOperative Dentistry
Volume33
Issue number6
DOIs
StatePublished - Nov 2008

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Resin Cements
Hardness
Ceramics
Light
AIDS-Related Complex
Polyesters
Polytetrafluoroethylene
Polymerization
Analysis of Variance
Fungi

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Borges, G. A., Agarwal, P., Miranzi, B. A. S., Platt, J., Valentino, T. A., & Santos, P. H. (2008). Influence of different ceramics on resin cement Knoop Hardness Number. Operative Dentistry, 33(6), 622-628. https://doi.org/10.2341/07-155

Influence of different ceramics on resin cement Knoop Hardness Number. / Borges, G. A.; Agarwal, P.; Miranzi, B. A S; Platt, Jeffrey; Valentino, T. A.; Santos, P. H.

In: Operative Dentistry, Vol. 33, No. 6, 11.2008, p. 622-628.

Research output: Contribution to journalArticle

Borges, GA, Agarwal, P, Miranzi, BAS, Platt, J, Valentino, TA & Santos, PH 2008, 'Influence of different ceramics on resin cement Knoop Hardness Number', Operative Dentistry, vol. 33, no. 6, pp. 622-628. https://doi.org/10.2341/07-155
Borges GA, Agarwal P, Miranzi BAS, Platt J, Valentino TA, Santos PH. Influence of different ceramics on resin cement Knoop Hardness Number. Operative Dentistry. 2008 Nov;33(6):622-628. https://doi.org/10.2341/07-155
Borges, G. A. ; Agarwal, P. ; Miranzi, B. A S ; Platt, Jeffrey ; Valentino, T. A. ; Santos, P. H. / Influence of different ceramics on resin cement Knoop Hardness Number. In: Operative Dentistry. 2008 ; Vol. 33, No. 6. pp. 622-628.
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