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Evaluation of the mechanical behavior of different ceramic systems after artificial thermical aging

Grant number: 16/20538-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2017
Effective date (End): December 31, 2017
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Erica Alves Gomes
Grantee:Stephanie Francoi Poole
Home Institution: Universidade de Ribeirão Preto (UNAERP). Campus Ribeirão Preto. Ribeirão Preto , SP, Brazil


Dental ceramics in the last years have been subjected of intensive research in an attempt to develop ceramic materials that covering the aesthetic and functional requirements for oral rehabilitation. Difficulties inherent to longevity of these materials related to function, is a factor questioned, since, because it is a brittle material. So, the ceramics are susceptible to catastrophic failures, such as fracture of the material, which is directly related to its exposure to the oral environment which may change the mechanical properties of material ceramic. Therefore, in order to evaluate changes caused on the surface of the ceramic material during its clinical application, studies have been developed using artificial aging to simulate an oral environment. The aim of this study is to evaluate the mechanical behavior of different ceramic systems used with CAD/CAM after artificial aging. In this study will be evaluate 5 groups (n=15) represented by different ceramic systems (lithium dissilicate, lithium silicate zirconia reinforced, monolithic zirconia, zirconia and speed fire zirconia). 15 ceramic bars will be obtained for each group and subjected to sintering process. Then, they will have their evaluated microhardness and then will be evaluated again and the specimens will be subjected to artificial thermal aging (5-55ºC during 10.000 cycles). After this test, the microhardness of the sample will be evaluated again and the specimens will be subjected to evaluation of fracture toughness. Finally, qualitative and quantitative analysis of the samples by computerized micro-tomograph (¼TC) will be made. After obtaining the results of this study, all data will be tabulated and analyzed the variance and distribution of the data. Then, the most recommended statistical tests will be apply to each test, allowing better analysis of results. (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)
POOLE, STEPHANIE FRANCOI; PEREIRA, GABRIEL KALIL ROCHA; MORIS, IZABELA C. M.; MARQUES, ARTUR GAIOTO; RIBEIRO, RICARDO FARIA; GOMES, ERICA A. Physical properties of conventional and monolithic yttria-zirconia materials after low-temperature degradation. CERAMICS INTERNATIONAL, v. 45, n. 16, p. 21038-21043, NOV 2019. Web of Science Citations: 0.

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