Revista de Odontologia da UNESP
ISSN 1807-2577 (Eletrônico)
Artigo Original

Resistência de união de diferentes cimentos resinosos a cerâmica à base de dissilicato de lítio

Shear bond strenght between different resinous cements and lithium disilicate ceramic

Caroline Gomes MAZIOLI; Marcelo Massaroni PEÇANHA; Luiz Gustavo Dias DAROZ; Caíque ARAÚJO SIQUEIRA; May Anny Alves FRAGA

Resumo

Resumo: Introdução: O sucesso de restaurações indiretas depende de uma adequada união entre o cimento e o substrato dental. Portanto, a seleção e o conhecimento das características dos agentes cimentantes são importantes para a retenção da restauração indireta.

Objetivo: Avaliar a resistência de união de dois cimentos resinosos diferentes à cerâmica de dissilicato de lítio.

Metodologia: Dois grupos experimentais foram confeccionados: cimento resinoso convencional (Grupo CRC) e cimento resinoso autoadesivo (Grupo CRA). Para isso, dez discos de cerâmica de dissilicato de lítio (10 mm) foram pré-fabricados e, sobre cada disco, foram confeccionados quatro postes de cimento (0,7×1,0 mm), obtendo-se um total de 20 amostras de cada tipo de cimento. Os discos tiveram o mesmo tratamento de superfície para os dois grupos, que é padrão para as cerâmicas ricas em sílica, de acordo com o protocolo estabelecido pelo fabricante. As amostras foram submetidas ao teste de microcisalhamento para avaliar a resistência de união entre o cimento e a cerâmica. Posteriormente, o modo de falha foi analisado em microscópio ótico.

Resultado: Os dados obtidos foram submetidos a teste estatístico. Foi observado que o grupo CRC apresentou maiores valores de resistência de união (15,29 MPa) em relação ao grupo CRA (12,41 MPa). Na análise do modo de falha, nenhuma amostra obteve fratura do tipo adesiva. Em ambos os grupos, CRC (75%) e CRA (65%), obtiveram-se mais falhas do tipo mista, seguidas pela falha coesiva.

Conclusão: Ambos os cimentos apresentaram adesão à cerâmica. O cimento resinoso convencional apresentou maior adesão a cerâmica à base de dissilicato de lítio que o cimento resinoso autoadesivo.

 

Palavras-chave

Cerâmicas, resistência ao cisalhamento, cimentação, cimentos de resina, prótese dentária

Abstract

Abstract: Introduction: The success of indirect restorations depends on the union between cement and dental substrate. Therefore, the selection and knowledge of the characteristics of cement is important for the retention of indirect restoration.

Objective: Is to evaluate the bond strength of two different resin cements to ceramic lithium disilicate.

Methodology: Two experimental groups were made: conventional resin cement (CRC Group) and self-adhesive resin cement (CRA Group). With this, 10 lithium disilicate ceramics discs (10 mm) were prefabricated and on each disc were made 04 cement posts (0.7×1.0 mm), yielding a total of 20 samples of each type of cement. The disks had the same surface treatment for both groups, which is standard for the rich silica ceramic according to the protocol established by the manufacturer. The samples were submitted to microshear test to evaluate the bond strength between the cement and ceramics. Subsequently, the fail mode was analyzed in an optical microscope.

Result: Data were subjected to statistical analysis. It was observed that the CRC group had a higher bond strength (15.29 MPa) compared to CRA group (12.41 MPa). In the analysis of fail mode, neither samples obtained adhesive fracture. In both groups, CRC (75%) and CRA (65%) it was obtained more failures of the mixed type, followed by the cohesive failure.

Conclusion: Both cements showed adhesion on ceramic. The conventional resin cement showed better adherence to the ceramic base of lithium disilicate than the self-adhesive resin cement.

Keywords

Ceramics, shear strength, cementation, resin cements, dental prosthesis

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