Analysis of color stability and mechanical properties of CAD/CAM ceramics after corrosive-abrasive challenge

• Grant number: 23/03061-2
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2023
• End date: October 31, 2025
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Edson Alves de Campos
• Grantee: Edson Alves de Campos
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated researchers: Cristiane de Melo Alencar ; Joissi Ferrari Zaniboni

Abstract

The constant technological development of digital systems, including related to CAD/CAM ceramics, has been increasing. At the same time, acid erosion is afrequent problem in patients and can lead to degradation of both dental tissues anddrestorative materials. The aim of this project will be to evaluate the effect of corrosive-abrasive wear on the color stability and surface wear of CAD/CAM ceramics with different surface finishes (hand polishing, conventional glaze with one and two firings and extended glaze with one and two firings) using acid of intrinsic (hydrochloric acid)and extrinsic (citric acid) origin. Four hundred and eighty specimens will be obtained from CAD/CAM blocks of the following materials: IPS Emax CAD, IPS Empress CAD, Cerec Bloc and Celtra Duo CAD will be subdivided into six groups: Control (C), Manual Polish (PM), Conventional Glaze (GC), 2-Fire Conventional Glaze (GC2), Glaze Extended Firing (QE), and 2-Fire Glaze Extended Firing (QE2). Half of the samples from each group will be submitted to a corrosive challenge in a hydrochloricacid (HCl) solution (0.113% in deionized water, pH 1.2) and the other half to a corrosive challenge in a citric acid solution (0.3% in deionized, pH 2.6). In addition, an abrasive challenge will be performed using simulated brushing. Subsequently, color analysis will be performed using a reflection spectrophotometer, analysis of gloss, volume loss and surface roughness using Vickers profilometry andmicrohardness. Extra specimens will be evaluated in scanning electron microscopy for analysis of surface morphology. The results obtained in each of the tests will be subjected to descriptive statistical analysis as well as to the test of homogeneity andhomoscedasticity. Depending on the results of these tests, the appropriate statistical treatments will be chosen. (AU)