Wettability studies of glass rich in lantanium oxide on the zirconium oxide ceramics for dental implants applications

• Grant number: 08/00310-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2008
• End date: March 31, 2009
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Simone Pereira Taguchi Borges
• Grantee: Caue Martinez Marques Bighetti
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

The ceramics based on zirconium oxide (ZrO2) have been widely used in dental implants because it is bioinerte, it presents good mechanical strength, corrosion resistance and wear resistance when compared to metals, and the greater thoughness when compared with other ceramics. These properties are related to their microstructure and effects caused by crystalline phases transformations, inherent in ZrO2 ceramics, which makes it very attractive, especially as material for dental implants. Currently the conventional process to obtaining ceramics used in implants is a spontaneous infiltration of a glass in a zirconium oxide ceramic. The goal of the glass introduction into the ZrO2 matrix is further improve its mechanical properties and mainly the thougness, because the efforts during mastication can vary from 20 to 1000N. The glass composition used in this work is a mixture of oxides, denoted glass LA. It is proposed to study the wetting of the glass in three types of substrates sintered: (I) ZrO2 with 3 mol% of Y2O3 (called Z3) (II) 20 wt.% of Z3 with 80 wt.% of Al2O3, and (III) 80 wt.% of Z3 with 20 wt.% of Al2O3. The spontaneous infiltration depends on thermodynamics interactions of substrate/glass. The objective of this work is to study these interactions as: wettability (sessile drop method), possible reactions and phases transformations (X-ray diffraction - XRD) and microstructural analyzes (Scanning Eletron Microscopy-SEM/EDS). From the results of the microstructure, crystalline phases and wettability tests (curves of contact angle versus temperature or time) it is possible to draw the best parameters to produce ceramics applied to dental implants, by spontaneous infiltration process, and thus overcome the mechanical and aesthetic properties of the currently existing in the market. (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)

BIGHETTI, CAUE M. M.; RIBEIRO, SEBASTIAO; BORGES, SIMONE PEREIRA T.; STRECKER, KURT; MACHADO, JOAO PAULO B.; SANTOS, CLAUDINEI. Characterization of rare earth oxide-rich glass applied to the glass-infiltration of a ceramic system. CERAMICS INTERNATIONAL, v. 40, n. 1, B, p. 1619-1625, JAN 2014. (08/00310-1)

BIGHETTI, CAUE M. M.; RIBEIRO, SEBASTIAO; BORGES, SIMONE PEREIRA T.; STRECKER, KURT; MACHADO, JOAO PAULO B.; SANTOS, CLAUDINEI. Characterization of rare earth oxide-rich glass applied to the glass-infiltration of a ceramic system. CERAMICS INTERNATIONAL, v. 40, n. 1, p. 7-pg., 2014-01-01. (08/00310-1)