Influence of different glaze firing protocols on brittleness index, vickers hardness, fracture toughness, crack healing and abrasion resistance of ceramic CAD/CAM blocks

• Grant number: 20/01816-8
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2020
• End date: August 31, 2021
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• 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

Abstract

The objective of this study is to investigate the influence of different glaze firing protocols on the brittleness index and hardness (Vickers microhardness test), fracture toughness, crack healing mechanism and abrasion resistance (volume loss) on ceramic CAD/CAM blocks (E.max CAD, IPS Empress CAD and Cerec Blocs). For this, 201 specimens will be obtained, 67 for each material, divided into 5 groups: control (C), conventional glaze (G), conventional glaze with double firing (G2), extended glaze (EG) and extended glaze with double firing (EG2). The evaluation of the brittleness index and Vickers hardness will be performed using a microdurometer, the fracture resistance will be made obtained with the three-point bend test with a notch performed on the specimens, while crack healing will be qualitatively observed using scanning electron microscopy. For abrasion resistance, a pin-on-disc tribometer will be used and volume loss will be determined on a laser optical interferometer. The results obtained in each of the tests will be submitted to descriptive statistical analysis as well as the homogeneity and homoscedasticity tests. Depending on the results of such tests, appropriate statistical treatments will be applied. (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)

ZANIBONI, JOISSI FERRARI; SILVA, ARYVELTO MIRANDA; ALENCAR, CRISTIANE DE MELO; PORTO, THIAGO SOARES; JASINEVICIUS, RENATO GOULART; FORTULAN, CARLOS ALBERTO; DE CAMPOS, EDSON ALVES. Influence of different glaze firing protocols on the mechanical properties of CAD-CAM ceramic materials. JOURNAL OF PROSTHETIC DENTISTRY, v. 127, n. 6, p. 8-pg., 2022-06-01. (20/01816-8)