Analysis of coatings roughness and porosity and coatings used in titanium casting

• Grant number: 06/06127-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): May 01, 2007
• Effective date (End): December 31, 2007
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Gelson Luis Adabo
• Grantee: Camila Marrara Benjamim
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

The titanium has innumerable favorable characteristics, including: biocompatibility, high resistance to the corrosion, low density, high relation strength/mass, high ductility, low thermal conductivity, as well as adjusted mechanical properties that favor its increasing application in structures of prostheses. However, despite the current period of training of development reached with the available methods of casting, some defects still are frequent, as incomplete casting, internal porosity and extreme roughness. The aim of this study is to evaluate the roughness of surface, and the porosity of four phosphates–bonded investments and the zirconia base before and after the heating process, by means of a Rugosimeter Mitutoyo (400 Mitutoyo SJ - Japan). Thus, the proposal aims at obtaining subsidies for the study of the viability of the use of phosphates-bonded investment associates with a paste (the zirconia base or MgO/Al2O3) with purpose to prevent the contact of titanium with phosphates-bonded investment, since these provide an extreme layer of reaction and consequently they increase the roughness of surface of the casting structures in titanium.