A severidade da lesão de cárie induz maior atividade de sistemas antioxidantes e consequente redução do estresse oxidativo na saliva de crianças
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Data
2018-12-07
Autores
Araujo, Heitor Ceolin [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste estudo foi avaliar a relação entre os níveis de biomarcadores de estresse/ dano oxidativo na saliva de crianças e a severidade de cárie dentária classificada pelo Sistema Internacional de Classificação e Gerenciamento de Cárie (ICCMS™, termo em inglês International Caries Classification and Management System). Amostras de saliva não estimuladas foram coletadas de pacientes de 1-3 anos de idade, após 2 horas de jejum, no período da manhã, em uma creche do município de Birigui, SP, Brasil. As crianças foram divididas em 4 grupos (n=30/grupo), de acordo com a severidade de cárie, sendo livre de cárie (grupo A), lesão de cárie em estágio inicial (grupo B), lesão de cárie intermediaria (grupo C) e lesão de cárie em estágio avançado (grupo D). Foram avaliados os seguintes biomarcadores salivares de estresse oxidativo: dano oxidativo ou malonaldeído (MDA), mensurado pelo método de TBARS; capacidade antioxidante total (TAC), medida pelo ensaio do poder antioxidante férrico redutor; atividade antioxidante enzimática da superóxido dismutase (SOD) e atividade antioxidante não enzimática do ácido úrico (UA). Os dados foram analisados por ANOVA, seguido do teste de Student-Newman-Keuls, coeficientes de correlação de Pearson e Spearman, e regressão linear multivariada (p <0,05). Os resultados demonstraram que a quantidade de proteína total, TAC, atividade antioxidante enzimática e não-enzimática salivar aumentaram de acordo com a severidade das lesões de cárie, levando a redução do dano oxidativo salivar. Podemos concluir que quanto maior a severidade das lesões de cárie, maior atividade dos sistemas antioxidantes salivares, havendo, consequentemente, diminuição gradual do dano oxidativo salivar.
The objective of this study was to evaluate the relationship between the levels of biomarkers of oxidative stress / oxidative damage in children's saliva and the severity of dent al caries classified by the International Caries Classification and Management System (ICCMS TM ) . Unstimulated saliva samples were collected from patients 0 - 3 years old after 2 hours of fasting in the morning in a day care center in Birigui municipality. Th e children were divided into 4 groups (n = 30 / group), according to caries severity, being caries free (group A), early caries lesion (group B), inte rmediate caries lesion (group C ) and advanced carious lesion (group D). The following salivary biomarkers of oxidative stress were evaluated: oxidative or malonaldehyde damage (MDA), measured by the TBARS method; total antioxidant capacity (TAC), as measured by the ferric reducing antioxidant power test; enzymatic antioxidant activity of superoxide dismutase ( SOD) and non - enzymatic antioxidant activity of uric acid (UA). Data were analyzed by ANOVA, followed by Student - Newman - Keuls test, Pearson and Spearman correlation coefficients, and multivariate linear regression (p <0.05). The results sh owed that the conc entration of total protein, TAC, enzymatic antioxidant and non - enzymatic salivary activity increased according to the severity of caries lesions, leading to reduction of salivary oxidative damage. We can conclude that the greater the severity of caries les ions, the greater the activity of the salivary antioxidant systems, and consequently the gradual decrease of salivary oxidative damage.
The objective of this study was to evaluate the relationship between the levels of biomarkers of oxidative stress / oxidative damage in children's saliva and the severity of dent al caries classified by the International Caries Classification and Management System (ICCMS TM ) . Unstimulated saliva samples were collected from patients 0 - 3 years old after 2 hours of fasting in the morning in a day care center in Birigui municipality. Th e children were divided into 4 groups (n = 30 / group), according to caries severity, being caries free (group A), early caries lesion (group B), inte rmediate caries lesion (group C ) and advanced carious lesion (group D). The following salivary biomarkers of oxidative stress were evaluated: oxidative or malonaldehyde damage (MDA), measured by the TBARS method; total antioxidant capacity (TAC), as measured by the ferric reducing antioxidant power test; enzymatic antioxidant activity of superoxide dismutase ( SOD) and non - enzymatic antioxidant activity of uric acid (UA). Data were analyzed by ANOVA, followed by Student - Newman - Keuls test, Pearson and Spearman correlation coefficients, and multivariate linear regression (p <0.05). The results sh owed that the conc entration of total protein, TAC, enzymatic antioxidant and non - enzymatic salivary activity increased according to the severity of caries lesions, leading to reduction of salivary oxidative damage. We can conclude that the greater the severity of caries les ions, the greater the activity of the salivary antioxidant systems, and consequently the gradual decrease of salivary oxidative damage.
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Palavras-chave
Cárie dentária, Estresse oxidativo, Antioxidantes, Saliva, Dental caries, Oxidative stress