S-PRG-based resin composites: structural characterization and performance under erosive challenge

• Grant number: 19/25685-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2020
• End date: December 31, 2020
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Linda Wang
• Grantee: Leonardo Masiero Fogaça
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

Erosive tooth wear (ETW) is an increasingly prevalent reality in modern society and its progression affects the integrity of dental structures. The cervical region is one of the hardest hit areas, making up one of the noncarious cervical lesions (LCNC) and because it is thinner, may require restorative intervention. For its restoration, the material must have mechanical properties more similar to dentin's biomechanical behavior and be resistant to new acid challenges. There is no consensus on an ideal material, but resin-modified glass ionomer cement (CIVMR) has been considered the restorative standard. However, although they are considered bioactive products, which also stimulate biological responses to tooth structure, they have lower wear resistance. Faced with the constant acid challenge in cases of ETW may have its clinical longevity compromised. Given this scenario, composite resins, of regular or fluid consistency, have modernized and may also have characteristics of bioactivity, as is the case with products based on multi-ionic technology S-PRG. Being resinous materials, they have better mechanical properties and better aesthetics compared to CIVMR. Therefore, the aim of this study is to structurally characterize and evaluate the performance of restorative materials: CIVMR - Vitremer, S-PRG composite resins, regular (Beautifil II - RCB, Beautifil II LS - BLS, Beautifil Bulk Restorative - BBR) and (Beautifil Flow Plus F00 - RCF, Beautifil Bulk Flowable - BBF) against the erosion challenge. For this, the analysis of color stability, microhardness and dispersive energy spectroscopy (EDS) will be conducted before and after the erosive challenge in orange juice (3 daily cycles / 5 min / 5 days) and, in addition, degree of conversion by Fourier transform infrared spectroscopy (FTIR) of all restorative materials studied. For each test, statistical analysis of the collected data, if there is normal distribution, will be performed with 2-way ANOVA and Tukey tests (p <0.05).