An evaluation of wear resistance and microhardness of pressable low-fusing ceramic opposing different ceramic systems

• Grant number: 11/22097-0
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): March 01, 2012
• Effective date (End): December 31, 2012
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal researcher: Erica Alves Gomes
• Grantee: Mariana Trevizan
• Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil

Abstract

Wear of dental surfaces is a progressive phenomenon resulting from physiological and pathological conditions and may result in temporomandibular disorders. Ideally, restorative materials should be wear resistant and have minimal abrasive effects on their antagonists. Ceramics are an alternative to metal alloys, especially by its aesthetic potential. Because of the improvements in the physical and mechanical properties, the use of metal-free ceramic restorations has become possible, but the possibility of the ceramic wears the antagonist enamel is still a limitation. There are reports that the low-fusion ceramics are less abrasive than the enamel, and the pressable ceramics are less abrasive than conventional feldspathic porcelain. However, there is a lack of study evaluating the abrasiveness of low-fusing ceramic when conventional porcelain and the own low-fusion ceramics are used as an antagonist. The glaze produces a glassy and more resistant surface, so it is believed that this procedure may reduce the abrasiveness of the ceramic. However, it is known that the glazed surface can be easily removed after occlusal adjustment or shorter period in oral function, which may cause greater wear on the antagonist. Therefore, the aim of this in vitro study is to evaluate the wear resistance and microhardness of a pressable low-fusing ceramic opposing to conventional dental porcelain and pressable low-fusing ceramic in the glazed and polished conditions. (AU)