Avaliação em curto e médio prazo da sorção e da solubilidade de resinas compostas à base de metacrilato e de silorano em saliva artificial
Evaluation of short- and medium-term sorption and solubility of methacrylate or silorane-based composite resins in artificial saliva
Porto, Isabel Cristina C. de M.; Almeida, Amanda Gomes A.
Resumo
Introdução: A absorção/adsorção de moléculas de água por monômeros hidrofílicos dentro de materiais resinosos expostos à umidade da boca pode resultar em degradação. Objetivo: Este estudo avaliou sorção e solubilidade de resinas compostas à base de metacrilato e silorano em contato com saliva artificial, nos períodos de um dia (curto prazo), e 30 e 90 dias (médio prazo). Material e método: Sessenta corpos de prova foram confeccionados com as resinas Filtek Z250 e Filtek P90 Silorano (3M/ESPE), e depois imersos em saliva artificial a 37 ± 1 °C durante um, 30 e 90 dias. Os dados foram analisados usando-se ANOVA um fator/dois fatores seguido dos testes Tukey ou Tamhane (α = 0,05). Resultado: As médias de sorção das duas resinas aumentaram com o tempo (p = 0,001). A sorção de Z250 (1 e 90 d) foi significativamente maior do que de P90 (p = 0,008), com valores semelhantes após 30 dias. A solubilidade das resinas também aumentou com o tempo, com diferença significativa entre todos os períodos (p = 0,001), exceto para a resina P90 (entre 1 e 30 d). Não houve diferença estatística significante entre os grupos Z250 (1 d) e P90 (1 dia), Z250 (1 d) e P90 (30 d), e Z250 (30 d) e P90 (90 d). Para os demais pares, comprovaram-se diferenças significativas (p < 0,001). Conclusão: As propriedades de sorção e solubilidade das resinas compostas testadas foram influenciadas pelo tempo de exposição à saliva artificial. O silorano teve desempenho ora melhor ora semelhante à resina de metacrilato.
Palavras-chave
Abstract
Introduction: The absorption/adsorption of water molecules by hydrophilic monomers within the resinous material exposed to the humid environment of the mouth may result in degradation. Objective: This study evaluated the sorption and solubility of methacrylate-based resin and silorane in contact with artificial saliva after 1 day (short‑term), 30 days and 90 days (medium-term). Material and method: Sixty samples were prepared with Filtek Z250 and Filtek P90 Silorano (3M/ESPE) and then immersed in artificial saliva at 37 ± 1 °C for 1, 30 and 90 days. Data were analyzed using one-way/two-way ANOVA followed by the Tukey or Tamhane tests (α = 0.05). Result: The sorption and solubility of two resins increased with the evaluation time (p = 0.001). Sorption of Z250 (at 1 and 90 days) was significantly higher than that of P90 ( p = 0.008), and similar values were registered at 30 days. Resin solubility also increased with time and there were significant differences for all time periods (p = 0.001), except for P90 at 1 and 30 days. There were no significant differences between Z250 (1 day) and P90 (1 day), Z250 (1 day) and P90 (30 day), and Z250 (30 days) and P90 (90 days). Significant differences were shown for other pairings (p < 0.001). Conclusion: The solubility and sorption properties of the composites tested were influenced by time of exposure to artificial saliva. Silorane performed better than or similar results to methacrylate-based resin.
Keywords
Referências
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