Dual resin cement knoop hardness after different activation modes through dental ceramics

Brazilian Dental Journal

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