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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.)

Experimental and finite element study of residual thermal stresses in veneered Y-TZP structures

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Author(s):
Tanaka, Carina B. [1, 2] ; Harisha, Hossam [1] ; Baldassarri, Marta [1] ; Wolff, Mark S. [3] ; Tong, Hui [4] ; Meira, Josete B. C. [2] ; Zhang, Yu [1]
Total Authors: 7
Affiliation:
[1] NYU, Coll Dent, Dept Biomat & Biomimet, 433 First Ave, Room 810, New York, NY 10010 - USA
[2] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo - Brazil
[3] NYU, Coll Dent, Dept Cariol & Comprehens Care, Predoctoral Clin Educ, 345 East 24th St, New York, NY 10010 - USA
[4] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan - Peoples R China
Total Affiliations: 4
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 42, n. 7, p. 9214-9221, MAY 15 2016.
Web of Science Citations: 9
Abstract

The main complications of zirconia-based laminated systems are chipping and delamination of veneering porcelain, which has been found to be directly associated with the development of residual thermal stresses in the porcelain layer. This study investigates the effects of cooling rate and specimen geometry on the residual stress states in porcelain-veneered zirconia structures. Bilayers of three different shapes (bars, semi-cylindrical shells, and arch-cubic structures) with 1.5 mm and 0.7 mm thickness of dentin porcelain and zirconia framework, respectively, were subjected to two cooling protocols: slow cooling (SC) at 32 degrees C/min and extremely-slow cooling (XSC) at 2 degrees C/min. The residual thermal stresses were determined using the Vickers indentation method and validated by finite element analysis. The residual stress profiles were similar among geometries in the same cooling protocol. XSC groups presented significantly higher tensile stresses (p= 0.000), especially for curved interfaces. XSC is a time-consuming process that showed no beneficial effect regarding residual stresses compared to the manufacturer recommended slow cooling rate. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 13/06988-8 - Chipping of veneered Y-TZP zirconia: experimental and finite element analysis study
Grantee:Josete Barbosa Cruz Meira
Support type: Regular Research Grants
FAPESP's process: 12/17094-5 - Veneered zirconia chipping: experimental and FEA study
Grantee:Carina Baptiston Tanaka
Support type: Scholarships in Brazil - Doctorate (Direct)