Estudo quantitativo da permeabilidade de lesões cariosas naturais de esmalte à solução de Thoulet

• Ano de defesa: 2014
• Autor(a) principal: Meira, Kássia Regina Simões
• 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: Esmalte; Cárie dental; Histologia; Permeabilidade; Enamel; Dental Caries; Histology; Permeability; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/6664

In natural enamel caries, remineralization and resin infiltration are directly dependent on the permeability of the enamel to the agents that promote them. Due to its low permeability, the surface layer of carious lesions has been considered, a natural barrier for penetration of such agents. In this study we provide, for the first time, quantitative volumetric data on the infiltration of a test solution (aqueous solution of mercuric and potassium iodide: Thoulet s solutions) in the surface layer of natural enamel caries and confirmed our hypothesis that the ratio of the squared water volume by pore volume (αd) is, among all major component volumes (mineral, organic, total water and loosely bound water), the best predictor of the proportion of the pore volume infiltrated by the tested solutions. The predictive value of αd was higher for Thoulet s solution with refractive index 1.47 (R2 = 0.505) compared to Thoulet s solution with refractive index 1.40 (R2=0.435). Real-time 2D mapping of infiltration revealed that penetration of the solution started on the original enamel surface, followed the prism paths towards the bottom of the body of the lesion, and caused air flow in the opposite direction. Infiltration was negligible through the pores at the surfaces exposed by cutting and grinding. Data on effective pore volume, pore viscosity and from fluid flow mechanics provided new information on the nature of the infiltration of materials in the surface layer of natural enamel caries. Our results might provide a deeper insight into the transport of agents used to promote remineralization and resin infiltration in natural enamel caries.