Effect of calcium orthophosphate composites on microhardness of enamel exposed to cariogenic challenge

• Grant number: 17/06446-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): September 01, 2017
• Effective date (End): September 30, 2019
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Roberto Ruggiero Braga
• Grantee: Mirella Flávia Corrêa Pinto
• Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Though the severity and prevalence of dental caries have decreased significantly in developed countries, the need to increase the lifetime of restorative treatments using composite resins remains. Studies have shown that ions released by restorations containing calcium orthophosphate particles can protect the surrounding enamel against cariogenic challenges. The purpose of this project is to verify the possible protective effect on enamel by experimental composites containing dicalcium phosphate dihydrate (DCPD) nanoparticles using microhardness testing. Cavities prepared on the labial surface of bovine incisor teeth will be restored using one of the following materials (n=10): experimental composite containing 60 vol% of barium silicate glass (control 1), experimental composites containing 10% and 20% of DCPD (replacing part of the glass particles) and a resin-modified glass ionomer cement (control 2). The specimens will be exposed to pHcycling for 14 days oand then have their surface and transverse microhardness analyzed. The percent difference of enamel microhardness between the control side (protected by cosmetic enamel) and the side exposed to pH cycling will be calculated. Data will be tested for normality and homoscedasticity in order to define the most suitable methodto be used in the statistical analysis. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CHIARI, MARINA D. S.; RODRIGUES, MARCELA C.; PINTO, MIRELLA F. C.; VIEIRA, DOUGLAS N.; VICHI, FLAVIO M.; VEGA, OSCAR; CHRZANOWSKI, WOJCIECH; NAGAOKA, NORIYUKI; BRAGA, ROBERTO R.. Development of brushite particles synthesized in the presence of acidic monomers for dental applications. Materials Science & Engineering C-Materials for Biological Applications, v. 116, NOV 2020. (17/06446-1, 16/50321-6, 16/25971-7)