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Influence of the specimen geometry in studies of thermal stresses of veneered zirconia: a finite element study

Grant number: 12/15910-0
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2012
Effective date (End): November 30, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Josete Barbosa Cruz Meira
Grantee:Alice Natsuko Jikihara
Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The all-ceramic crowns with Y-TZP framework has been widely explored in clinical practice, because of its aesthetic and mechanical properties. However, recently the clinical reports of chipping in the veneering porcelain have increased. It has been pointed that this type of failure is favored by thermal stresses generated during the cooling process. Some recent studies have evaluated these stresses on veneering porcelain using bilayered discs. However, the disc shape does not represent the complexity of a prosthetic crown. Since the geometry of the specimen has a significant influence on the distribution of thermal stresses, our hypothesis is that the results obtained for specimens with simple geometry may differ from those corresponding to the tooth crown. Thus, this study will analyze by finite elements, the thermal stress distribution in models with different shapes. The geometries will be generated in the CAD software and imported into finite element softwares. The analysis will consist in two steps: the heat transfer analysis, followed by a mechanical analysis. The results will be based on the evolution of curves of temperature as a function of time and stress as a function of temperature. In addition, maximum principal stress (sigma 1) and minimum principal stress (sigma 3) distributions will be compared. (AU)

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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)
JIKIHARA, ALICE N.; TANAKA, CARINA B.; BALLESTER, RAFAEL Y.; SWAIN, V, MICHAEL; VERSLUIS, ANTHEUNIS; MEIRA, JOSETE B. C.. Why a zero CTE mismatch may be better for veneered Y-TZP structures. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 96, p. 261-268, . (12/15910-0, 13/06988-8)

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