Revista de Odontologia da UNESP
https://revodontolunesp.com.br/article/doi/10.1590/S1807-25772013000300009
Revista de Odontologia da UNESP
Original Article

Estabilidade dimensional de uma resina acrílica para coroas provisórias em função de diferentes técnicas de processamento ao longo do tempo

Long-term dimensional stability of an acrylic resin for provisional crowns with different types of processing techniques

Garcia-Lopez, David Alejandro; Rezende, Carlos Eduardo E.; Hiramatsu, Daniel Afonso; Nishida, Cinthia Lumi; Rubo, José Henrique

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Resumo

Introdução: A estabilidade dimensional das resinas acrílicas influencia na adaptação das coroas provisórias e, consequentemente, no resultado do tratamento reabilitador. Objetivo: Avaliar a estabilidade dimensional, ao longo do tempo, de uma resina acrílica processada de diferentes maneiras. Material e método: Cinco técnicas de polimerização da resina acrílica foram testadas: I – polimerização térmica utilizando líquido de polimerização rápida em mufla; II – autopolimerização sob pressão; III – autopolimerização utilizando pincel; IV – autopolimerização após mistura (pó + líquido) em pote Dappen e inserção em matriz de aço na fase arenosa; V – autopolimerização após mistura em pote Dappen com inserção na matriz metálica na fase plástica. Foram confeccionados dez corpos de prova para cada tipo de processamento. Avaliou-se a estabilidade dimensional por meio de matriz de aço inox confeccionada segundo a especificação nº19 da ADA. Os corpos de prova foram armazenados em água destilada a 37°C e examinados nos períodos de 1 hora, 1, 7, 15, 10, 90 e 180 dias após a polimerização, com o auxílio de um microscópio óptico com aumento de 20×. Os resultados foram submetidos à análise de dupla variância (Teste de Tukey para Tempo e Técnica de processamento) em nível de 5% de significância. Resultado: Todos os grupos experimentais apresentaram alterações dimensionais entre o sétimo e o 15º dia; após esse período de tempo, houve alterações dimensionais estatisticamente significantes, para as diferentes técnicas estudadas. Conclusão: A estabilidade dimensional da resina acrílica não sofreu influência das diferentes técnicas de processamento avaliadas; entretanto, foi influenciada pelo tempo de armazenamento.

Palavras-chave

Prótese parcial fixa, adaptação marginal dentária, restauração dentária temporária, polimetil metacrilato

Abstract

Introduction: The dimensional stability of acrylic resins influences the temporary crowns fitting and can affect the final restoration results. Objective: To evaluate the long-term dimensional stability of an acrylic resin used for fabrication of provisional crowns. Material and method: Five types of processing techniques were evaluated: I – thermal polymerization using fast polymerization liquid and flask; II – auto-polimerization under pressure in a stainless steel matrix; III – auto-polimerization using the bead brush technique to build the sample; IV – auto-polimerization after mixture (powder + liquid) in a dappen dish and insertion in a stainless steel matrix at the sand stage; V – auto-polimerization after mixture in a dappen dish with insertion in a stainless steel matrix at the plastic stage. For each type of processing technique, 10 samples were made. Dimensional stability was evaluated by means of a steel matrix made following the ADA specification nº19. The samples were stored in distilled water at 37 °C and examined at the periods of 1 hour, 1, 7, 15, 30, 90 and 180 days, with an optic microscope with 20× magnification. The results were subjected to the 2-way analysis of variance (Tukey Test) at the significance level of 5% for the variables Time and Processing Technique. Result: All samples had dimensional alterations from day 7 to the day 15, regardless of the technique used. From day 15 to 180, there were no statistically significant dimensional alterations. Conclusion: The dimensional stability of the acrylic resin was not influenced by the different processing techniques tested, however, it was influenced by the storage time.

Keywords

Denture, partial, fixed, dental marginal adaptation, dental restoration, temporary, polymethyl methacrylate

References

 


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