Development and characterization of phyllosilicate-modified glass ionomer cement

• Grant number: 18/23578-1
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): April 01, 2019
• Effective date (End): December 31, 2019
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal researcher: Regina Maria Puppin Rontani
• Grantee: Luana de Antonis Pitton
• Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil

Abstract

Glass ionomer cement (GIC) is a material widely used in dentistry because it has chemical bonding to dental structure and fluoride release. Despite that, GIC presents low cohesive strength and high water sorption and solubility rates, which imply low longevity and limit the indications of material use. In an attempt to improve the mechanical properties, several compounds were added to GIC, however, were not fully effective or involved in reducing fluoride release. In this sense, it is necessary to use compounds that may have a GIC similar chemical structure. For this reason, the filosilicates minerals, such as mica, can be highlighted because they are minerals composed basically of silicon, aluminum and may contain fluorine, calcium, and magnesium. These materials have good insulating properties, favorable optical properties, and good mechanical resistance when used in civil construction. Thus, the hypothesis of the present study is that GIC's modified by filosilicates have their properties improved. Four different concentrations of mica will be added to GIC powder and the material tested after conventional manipulation. Microstructure (SEM and EDS), mechanical properties (compressive strength and microhardness), gloss, water sorption measurements and solubility for all groups will be analyzed. Statistical normality tests will be applied and the comparisons between groups will be done at 5% significance level.