Fatigue life analysis of ultra-translucent zirconia crowns coated by antimicrobial glasses

• Grant number: 23/03271-7
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: September 21, 2023
• End date: September 20, 2024
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Renata Marques de Melo Marinho
• Grantee: Ana Carolina da Silva
• Supervisor: Jason Alan Griggs
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil
• Institution abroad: University of Mississippi Medical Center (UMMC), United States
• Associated to the scholarship: 21/03878-3 - Analysis of mechanical, microbiological behavior and life in fatigue of zirconia abutments with silver glass, BP.DR

Abstract

Associated with the process #2021/03878-3, in which the analysis of fatigue life, mechanical and antimicrobial properties of 5Y-PSZ zirconia abutments with antimicrobial glass is proposed, the present project applies for one year research as an internship in the University of Mississippi Medical Center. Zirconia is frequently used in prosthetic rehabilitation because of its mechanical properties. However, when exposed to oral environment and subjected to under low temperature, it undergoes the low temperature degradation. This process negatively affects the mechanical properties of zirconia which allows the appearance of microfractures, increases the roughness, and consequently favors the accumulation of biofilm. Therefore, the development of antimicrobial glasses to be applied over zirconia can be a way to improve the mechanical properties of the material, besides reducing the accumulation of microorganisms. The aim of this project is to perform the fatigue analysis and mechanical properties maxillary central incisor zirconia crowns coated with antimicrobial glasses adhesively cemented on G10 dyes. 54 crowns of UTML ultra-translucent zirconia (KATANA ", Kuraray Noritake Dental Inc, Tokyo, Japan) will be used and divided into 3 groups: 5Y-C (zirconia as sintered); 5Y-SL (zirconia with soda-lime glass) and 5Y-SLAg (zirconia with silver-doped soda-lime glass). The crowns will be subjected to a fatigue test (step-wise stress). Fractured specimens will be visually inspected under a scanning electron microscopy (MEV) to determine the fracture origin. The specimens will be scanned before and after complete the fatigue test. The quantification of wear will be obtained by superimposing of its stl files. The expected result is to show that UTML zirconia coated with antimicrobial glasses do not affect the mechanical performance of zirconia restorations. (AU)