Please use this identifier to cite or link to this item: http://guaiaca.ufpel.edu.br:8080/handle/123456789/879
metadata.dc.type: Article
Title: Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent
Authors: Pazin, Milena C.
Moraes, Rafael Ratto de
Gonçalves, Luciano de Souza
Borges, Gilberto A.
Sinhoreti, Mário Alexandre Coelho
Correr Sobrinho, Lourenço
Abstract: This study investigated the influence of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of a dual-cured resin luting agent. Discs of Empress Esthetic (Ivoclar Vivadent) of 0.7-, 1.4- and 2-mm thickness were prepared. Variolink II(Ivoclar Vivadent)was placed in a 1-mm-thick cylindrical mold, and light-activated through ceramic for 40 s, using QTH or LED units. The samples were divided into dual, light, and chemically-polymerized control groups. Knoop hardness indentations were made on the top and bottom surfaces. Data were subjected to split-plot design three-way ANOVA and Tukey’s test (P< 0.05). The light spectrum transmitted through ceramic was obtained using a spectrometer. Samples activated through 1.4-and 2-mm-thick discs showed lower hardness than all others groups, except for the chemical control group. Dual and light-polymerized control samples showed similar hardness to those activated through the 0.7-mm ceramic, whereas chemically polymerized control samples showed similar hardness to those activated through 1.4- and 2-mm ceramics. No significant differences in hardness were detected between the curing units or between the top and bottom layers. No significant alteration in the light spectrum profile was observed for both units, irrespective of the ceramic thickness.
Keywords: Ceramic
Hardness
Light spectrum
Luting agent
Polymerization
Publisher: Nihon University School of Dentistry
Citation: PAZIN, MIilena C. ; MORAES, Rafael Ratto de; GONÇLVES, Luciano de Souza; BORGES, Gilberto A.; SINHORETI, Mário Alexandre Coelho; CORRER SOBRINHO, Lourenço. Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent. Journal of Oral Science, v. 50, p. 131-136, 2008
URI: http://hdl.handle.net/123456789/879
Issue Date: 2008
Appears in Collections:Departamento de Odontologia Restauradora: Artigos de periódicos



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