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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
da Silva, Lucas Hian [1] ; Ribeiro, Sebastiao [2] ; Souto Borges, Alexandre Luis [3] ; Cesar, Paulo Francisco [1] ; Tango, Rubens Nisie [3]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Dental Materials; v. 30, n. 11, p. E283-E288, NOV 2014.
Web of Science Citations: 4
Abstract

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)

FAPESP's process: 10/02653-3 - Fracture resistance and phase conversion of new shape abutment developed in yttria-stabilized zirconia (YTZP) submitted to different preparation methods
Grantee:Lucas Hian da Silva
Support Opportunities: Scholarships in Brazil - Master