FEA and microstructure characterization of a one-piece Y-TZP abutment

Autor(es)

da Silva, Lucas Hian ^[1] ; Ribeiro, Sebastiao ^[2] ; Souto Borges, Alexandre Luis ^[3] ; Cesar, Paulo Francisco ^[1] ; Tango, Rubens Nisie ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Dent, Dept Biomat & Oral Biol, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Lorenas Engn Sch, Dept Mat Engn, Lorena, Sao Paulo - Brazil

^[3] Sao Paulo State Univ UNESP, Fac Dent, Dept Ddent Mat & Prosthodont, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 30, n. 11, p. E283-E288, NOV 2014.
• Citações Web of Science: 4

Resumo

Objectives. The most important drawback of dental implant/abutment assemblies is the need for a fixing screw. This study aimed to develop an esthetic one-piece Y-TZP abutment to suppress the use of the screw. Methods. Material characterization was performed using a bar-shaped specimen obtained by slip-casting to validate the method prior to prototype abutment fabrication by the same process. The mechanical behavior of the prototype abutment was verified and compared with a conventional abutment by finite element analysis (FEA). The abutment was evaluated by micro-CT analysis and its density was measured. Results. FEA showed stress concentration at the first thread pitch during installation and in the cervical region during oblique loading for both abutments. However, stress concentration was observed at the base of the screw head and stem in the conventional abutment. The relative density for the fabricated abutment was 95.68%. Micro-CT analysis revealed the presence of elongated cracks with sharp edges over the surface and porosity in the central region. Significance. In the light of these findings, the behavior of a one-piece abutment is expected to be better than that of the conventional model. New studies should be conducted to clarify the performance and longevity of this one-piece Y-TZP abutment. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/02653-3 - Resistência à fratura e análise da conversão de fases de novo formato de pilar protético desenvolvido em zircônia estabilizada por ítrio (YTZP) frente a diferentes métodos de preparo
• Beneficiário: Lucas Hian da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado