Brazilian Dental Journal | |
Dual resin cement knoop hardness after different activation modes through dental ceramics | |
Thiago Assunção Valentino2  Gilberto Antonio Borges2  Luis Henrique Borges2  Jain Vishal1  Luis Roberto Marcondes Martins1  Lourenço Correr-sobrinho1  | |
[1] ,University of Uberaba Department of Dental Materials and Restorative Dentistry Uberaba MG ,Brazil | |
关键词: dental ceramic; hardness; luting agent; polymerization; | |
DOI : 10.1590/S0103-64402010000200003 | |
来源: SciELO | |
【 摘 要 】
This study investigated the influence of ceramic compositions on Knoop Hardness Number (KHN) immediately and 24 h after polymerization and the effect of activation modes on the KHN of a resin cement. Ten Panavia F 2.0 resin cement discs were activated either directly using curing light, or chemically without light, or through 1.2-thick ceramic discs. The following ceramics were evaluated: Duceram, Cergogold, IPS Empress, IPS Empress 2, Procera, Cercon, In Ceram Alumina and In Ceram Zirconia. The KHN was obtained immediately and after 24-h testing time. Two-way ANOVA and Tukey's test were performed for statistical analysis (p<0.05). Direct activation showed higher KHN than activation through ceramics and chemical activation for both immediate and 24-h post activation. The KHN for 24-h post activation time was higher than that of the immediate post activation time except for the direct activation mode. The glass and di-silicate based ceramics showed higher KHN than alumina- and zirconia-based ceramics, immediately and after 24-h. The reinforced and opaque ceramics had the lowest KHN. The ceramic composition resulted in light attenuation, lower polymerization and lower KHN, and the 24-h testing time promoted an improvement of KHN except for direct activation mode.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
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RO202005130109609ZK.pdf | 278KB | download |