Estudo comparativo entre lesões cariosas artificiais e naturais de esmalte com relação à permeabilidade da camada superficial

• Ano de defesa: 2014
• Autor(a) principal: Ferreira, Danilo Augusto de Holanda
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraí­ba; BR; Odontologia; Programa de Pós Graduação em Odontologia; UFPB
• Palavras-chave em Português: Histopatologia; Cárie artificial em esmalte; Volumes bioquímicos; Permeabilidade; Histopathology; Artificial enamel caries; Biochemical volumes; Permeability; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/6659

The aim of this study was to compare artificial carious enamel lesions induced with an acid gel containing large amounts of organic matter and artificial carious lesions induced by an acidic solution (with little organic constituent) regarding organic volume and permeability (&#61537;d). Thirty teeth (twenty third molar and ten molars with inactive white spot lesions) were divided into three groups. In order to induce artificial caries, ten teeth were exposed to an acid gel containing hydroxyethylcellulose 2% and 50 mM lactic acid at pH 4.5 (Gel; n = 10) while the other ten teeth a demineralizing solution (0,1 mM lactic acid, 11.7 mM of calcium, chloroform 0.5% v/v, 6 mM phosphate, pH 4.5) (Solution; n = 10). As a control group, the teeth containing white spot lesions were also analyzed (Natural Caries, n = 10). Three points were analyzed in each sample at the surface layer in each lesion at 50&#956;m intervals. The results obtained in each of the three groups were compared with theoretical mathematical found values in the literature as a way to standardize the comparison. Finally, variations in organic volume (Ratio &#61538;) and permeability (Ratio &#61537;d) in relation to predicted values were compared between groups. For variable Ratio &#61538;, there was a significant difference between the gel and solution [p<0.0001, ANOVA; Effect Size (ES)=1.84] and between solution and the natural caries (p=0.001, ANOVA; ME=0.46). Similarly, the values of Ratio &#61537;d between Gel/Solution (p<0.0001, Mann-Whitney, ES=0.96) and Solution/Natural caries (p<0.0001; Mann-Whitney; ME=1.15) differed significantly. There was no statistically significant difference between the groups Gel and Natural Caries for Ratio &#61538; (p=0.585, ANOVA, ES=0.30) and the Ratio &#61537;d (p=0.940, Mann-Whitney, ES=0.01). It was concluded that, as in natural decay, the surface layer of artificial carious enamel lesions created with organic acid gel showed higher organic matter and lower permeability compared to those induced in acidic solution.