Efeito da incorporação do glicerofosfato de cálcio ao cimento de ionômero de vidro nas propriedades físico-mecânicas e na desmineralização do esmalte
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Data
2016-09-02
Autores
Santos, Samia Sass [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do presente estudo foi avaliar o efeito da incorporação do glicerofosfato de cálcio (CaGP) ao cimento de ionômero de vidro (CIV) nas propriedades físicomecânicas e na desmineralização do esmalte. Foram confeccionados corpos-de-prova (n=56) para cada grupo experimental: CIV sem CaGP (CIV), CIV com CaGP 1, 3 e 9%. Seis corpos-de-prova foram utilizados na determinação da liberação de fluoreto (F), cálcio (Ca) e fósforo (P) em soluções de desmineralização e remineralização durante 15 dias. As propriedades físico-mecânicas avaliadas 24 horas e 7 dias após a confecção foram: resistência à compressão (n=12), resistência à tração diametral (n=12), dureza de superfície do material (n=6) e grau de conversão de monômeros (n=8). Para o estudo da desmineralização do esmalte, corpos-de-prova (n=12) foram adaptados a blocos de esmalte selecionados pelo teste de dureza de superfície inicial (DS1) e submetidos às ciclagens de pH. A seguir, foi analisada a dureza de superfície final (DS2) e a concentração de F, Ca e P no esmalte. Os dados foram submetidos a análise de variância seguida pelo teste de Student-Newman-Keuls (p<0,05). A adição de CaGP levou a maior média de liberação de F, Ca e P pelos materiais quando comparado ao CIV (p<0,001). As propriedades mecânicas (tração, compressão e dureza) com a adição de 1% e 3% CaGP apresentaram dentro da variação dos cimentos ionoméricos. O grau de conversão não diferiu entre os grupos nos tempos de 24 horas e 7 dias (p>0,439). A adição de 3% e 9% CaGP reduziu a perda mineral e aumentou o F, Ca e P no esmalte Resumo Sâmia Sass Santos quando comparado ao CIV (p<0,05). Pode-se concluir que a incorporação de 3% CaGP ao CIV aumenta a liberação de F, P e Ca, promove redução na desmineralização do esmalte mantendo as propriedades físico-mecânicas dentro dos parâmetros para este material.
The aim of this study was to evaluate the effect of addition of calcium glycerophosphate (CaGP) to the glass ionomer cement (GIC) on the physico-mechanical properties and demineralization of the enamel. Specimens (n=56) were fabricated from each experimental group: GIC without CaGP (GIC), GIC with 1, 3 and 9% CaGP. To determine the release of fluoride (F), calcium (Ca) and phosphorus (P) were used six specimens immersed into a demineralization and remineralization solutions during 15 days. The physico-mechanical properties evaluated 24 hours and 7 days after fabrication were: compressive strength (n=12), diametral tensile strength (n=12), surface hardness of material (n=6) and the degree of conversion of monomers (n=8). For the study of enamel demineralization, specimens (n=12) were attached to enamel blocks selected by the initial surface hardness test (SH1) and submitted to the pH-cycling. Following, final surface hardness (SH2) and the concentration of F, Ca and P in enamel were determined. Data were subjected to analysis of variance followed by Student-Newman-Keuls test (p<0.05). The addition of CaGP led to higher mean release of F, Ca and P by materials compared to the GIC (p<0.001). The mechanical properties (diametral tensile, compressive strength and hardness) were within the range of the ionomeric cements after addition of 1% and 3% CaGP. The degree of conversion was not different between groups at 24 hours and 7 days (p>0.439). The addition of 3% and 9% CaGP reduced mineral loss and increased F, Ca and P in the enamel when compared to the GIC (p<0.05). It can be concluded that the incorporation of 3% CaGP in the GIC increases the release of F, P and Ca, promotes reduction in enamel demineralization maintaining the physico-mechanical properties within the parameters for this material.
The aim of this study was to evaluate the effect of addition of calcium glycerophosphate (CaGP) to the glass ionomer cement (GIC) on the physico-mechanical properties and demineralization of the enamel. Specimens (n=56) were fabricated from each experimental group: GIC without CaGP (GIC), GIC with 1, 3 and 9% CaGP. To determine the release of fluoride (F), calcium (Ca) and phosphorus (P) were used six specimens immersed into a demineralization and remineralization solutions during 15 days. The physico-mechanical properties evaluated 24 hours and 7 days after fabrication were: compressive strength (n=12), diametral tensile strength (n=12), surface hardness of material (n=6) and the degree of conversion of monomers (n=8). For the study of enamel demineralization, specimens (n=12) were attached to enamel blocks selected by the initial surface hardness test (SH1) and submitted to the pH-cycling. Following, final surface hardness (SH2) and the concentration of F, Ca and P in enamel were determined. Data were subjected to analysis of variance followed by Student-Newman-Keuls test (p<0.05). The addition of CaGP led to higher mean release of F, Ca and P by materials compared to the GIC (p<0.001). The mechanical properties (diametral tensile, compressive strength and hardness) were within the range of the ionomeric cements after addition of 1% and 3% CaGP. The degree of conversion was not different between groups at 24 hours and 7 days (p>0.439). The addition of 3% and 9% CaGP reduced mineral loss and increased F, Ca and P in the enamel when compared to the GIC (p<0.05). It can be concluded that the incorporation of 3% CaGP in the GIC increases the release of F, P and Ca, promotes reduction in enamel demineralization maintaining the physico-mechanical properties within the parameters for this material.
Descrição
Palavras-chave
Cimentos de ionômeros de vidro, Desmineralização do dente, Polimerização, Força compressiva, Fosfatos, Glass ionomer cements, Tooth demineralization, Polymerization, Compressive strength, Phosphates