The potential of salivary albumin to degrade composite resin

唾液 白蛋白 努氏硬度试验 化学 复合数 抗弯强度 压痕硬度 核化学 色谱法 牙科 复合材料 材料科学 生物化学 医学 结晶学 微观结构
作者
Leonardo Santos de Barros,Giovanna Corrêa Denucci,Flávia Lucisano Botelho do Amaral,Fabiana Mantovani Gomes França,Roberta Tarkany Basting,Cecília Pedroso Turssi
出处
期刊:Acta odontológica latinoamericana 卷期号:36 (1): 34-39
标识
DOI:10.54589/aol.36/1/34
摘要

Albumin is a salivary enzyme capable of cleaving ester linkages and catalyzing degradation of resin-based dental materials. However, the effect of concentration-dependent esterolytic action on composite resins as yet remains unexplored.The purpose of this study was to evaluate whether artificial saliva formulations with different concentrations of albumin affected the surface roughness, flexural strength and microhardness of a composite resin.Specimens (25x2x2mm) of a nanofilled composite (Filtek Z350XT, 3M/ESPE) were prepared and analyzed for average surface roughness (Ra/pm). The specimens were then allocated to 6 groups (n=30), to be treated with different salivary albumin concentrations: 0, 10, 50, 100, 200, 400 pg/mL. The specimens were stored in their respective artificial saliva groups, half of them for 24 h and the remainder for 180 days (artificial saliva renewed weekly), after which they were submitted to a new Ra reading, and tested for three-point flexural strength (FS, MPa). The specimens stored for 180 days were analyzed for Knoop microhardness (KH, Kg/mm2). Data were submitted to two-way ANOVA (Ra and FS) and one-way ANOVA (KH).Although Ra increased (p < 0.001) and FS decreased (p < 0.001) from 24 hours to 180 days of storage, the albumin concentration did not significantly affectRa (p = 0.168), FS (p = 0.477) or KH (p = 0.378).The esterolytic action of albumin did not increase the artificial-saliva-induced hydrolytic degradation of the composite resin.Albumina, uma enzima encontrada na saliva, é capaz de clivar ligagoes éster e catalisar a degradando de materiais dentários á base resina. Apesar da agao esterolítica ser potencialmente concentragao-dependente, a investigando desse efeito sobre resinas compostas ainda permanence inexplorado. Objetivo: O objetivo deste estudo foi avaliar se formulagoes de saliva artificial contendo diferentes concentragoes de albumina afetariam a rugosidade superficial, a resistencia flexural e a microdureza de uma resina composta. Materials e Método: Corpos de pro-va em barra (25x2x2mm) foram confeccionados a partir de uma resina composta nanoparticulada (Filtek Z350XT, 3M/ESPE) e foram submetidos á leitura de rugosidade superficial média inicial (Ra, pm), em rugosímetro. Entao, as amostras foram divididas em 6 grupos (n=30) de acordo com a concentrando de albumina na saliva: 0, 10, 50, 100, 200, 400 pg/mL. As amostras foram armazenadas nas formulagoes de saliva artificial correspondente ao seu grupo, metade por 24 h e as demais por 180 dias (com trocas de saliva semanais). As amostras foram submetidas a no-vas leituras de rugosidade (Rafinal) e avaliadas quanto á resistencia flexural de tres pontos (RF, MPa). As amostras armazenadas por 180 dias foram avaliadas quanto á microdureza Knoop (KH, Kg/mm2). Os dados foram submetidos a análises de variáncia a dois critérios (Ra e RF) e a um critério (KH). Resultados: Apesar de haver aumento na Ra (p < 0,001) e uma diminuigao da RF (p < 0,001) de 24 h para 180 dias, a concentragao de albumina nao afetou significativamente a Ra (p = 0,168), a RF (p = 0,477) ou a KH (p = 0,378). Conclusoes: A agdo esterolítica da albumina nao aumentou a degradagao hidrolítica da resina composta induzida pela saliva artificial.
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