| Grant number: | 16/06272-0 |
| Support Opportunities: | Scholarships abroad - Research Internship - Master's degree |
| Start date: | July 16, 2016 |
| End date: | September 15, 2016 |
| Field of knowledge: | Health Sciences - Dentistry - Dental Materials |
| Principal Investigator: | Marco Antonio Bottino |
| Grantee: | Amanda Maria de Oliveira Dal Piva |
| Supervisor: | Cornelis Johannes Kleverlaan |
| 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: | Academic Centre for Dentistry Amsterdam (ACTA), Netherlands |
| Associated to the scholarship: | 15/13322-1 - New ceramic materials: evaluation of biofilm formation and viability of human gingival fibroblasts (FMM-1), BP.MS |
Abstract Recently, a new composition of ceramic material based on lithium silicate reinforced by zirconia was introduced in the market as a monolithic material aiming to overcome failure by chipping in veneering ceramic, reduce clinical time and restorations costs. The present investigation aims to evaluate the mechanical fatigue of Suprinity (Vita Zahnfabrik) ceramic using the step-stress method under different load situations. Cylinders of VITA Suprinity (Vita Zhanfabrik) ceramic blocks will be standardized with 12 mm diameter and sliced into 1.5 mm thick discs with the aid of a cutting machine (Isomet 1000, Precision Sectioning Saw, Buehler, Lake Bluff, Illinois, USA) with diamond disc (Series 15LC Diamond Blade wafering, Buehler, USA) under constant cooling water. The discs will have their surfaces polished using sandpaper in decreasing granulation #400- #1200 (30 s per sandpaper) until reaches the final dimensions of 12 mm x 1.2 mm. After cleaning in an ultrasonic bath with isopropyl alcohol for 5 minutes, the spesimens will be subjected to a crystallization cycle through a specific furnace (Vita Vacumat MP 6000, Vita Zahnfabrik, Germany). Then, the specimens will be submitted to biaxial flexural strength to calculate the mean load to failure and based upon the mean value, step stress accelerating life test profiles will be determined. Samples will be divided into three profiles - mild, moderate, and aggressive according to load increasing and number of cycles in each step of load. The samples will be submitted to a step-stress test under biaxial flexure (ACTA Fatigue Tester2, ACTA, Amsterdam, the Netherlands) at 1.7 Hz under water. Eighteen samples will be divided into loading profiles in 3:2:1 ratio. Reliability for a mission of 100,000 cycles at 400 N (90% two-sided confidence interval) and Weibull modulus two-sided 90% confidence intervals will be calculated for statistics analysis. The failed samples will be inspected in polarized light Stereomicroscope and some representative failed samples will be inspected under Scanning Electron Microscopy (SEM). (AU) | |
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