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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.)

Air-particle abrasion on zirconia ceramic using different protocols: Effects on biaxial flexural strength after cyclic loading, phase transformation and surface topography

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Author(s):
Souza, Rodrigo O. A. [1] ; Valandro, Luiz F. [2] ; Melo, Renata M. [3] ; Machado, Joao P. B. [4] ; Bottino, Marco A. [3] ; Oezcan, Mutlu [5]
Total Authors: 6
Affiliation:
[1] Univ Fed Paraiba, Dept Restorat Dent, Div Prosthodont, BR-59092220 Natal, RN - Brazil
[2] Univ Fed Santa Maria, Dept Restorat Dent, Div Prosthodont, BR-97015372 Santa Maria, RS - Brazil
[3] Sao Paulo State Univ, Sao Jose dos Campos Dent Sch, Dept Dent Mat & Prosthodont, BR-12245000 Sao Jose Dos Campos, SP - Brazil
[4] Natl Inst Spatial Res, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[5] Univ Zurich, Ctr Dent & Oral Med, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Dent Mat Unit, CH-8032 Zurich - Switzerland
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 26, p. 155-163, OCT 2013.
Web of Science Citations: 53
Abstract

This study evaluated the effect of different air particle abrasion protocols on the biaxial flexural strength and structural stability of zirconia ceramics. Zirconia ceramic specimens (ISO 6872) (Lava, 3M ESPE) were obtained (N=336). The specimens (N=118, n=20 per group) were randomly assigned to one of the air-abrasion protocols: Gr1: Control (as-sintered); Gr2: 50 mu m Al2O3 (2.5 bar); Gr3: 50 mu m Al2O3 (3.5 bar); GT4: 110 mu m Al2O3(2.5 bar); Gr5: 110 mu m Al2O3 (3.5 bar); GT6: 30 mu m SiO2 (2.5 bar) (CoJet); Gr7: 30 mu m SiO2(3.5 bar); Gr8: 110 mu m SiO2 (2.5 bar) (Rocatec Plus); and Gr9: 110 mu m SiO2 (3.5 bar) (duration: 20 s, distance: 10 mm). While half of the specimens were tested immediately, the other half was subjected to cyclic loading in water (100,000 cycles; 50 N, 4 Hz, 37 degrees C) prior to biaxial flexural strength test (ISO 6872). Phase transformation (t -> m), relative amount of transformed monoclinic zirconia (F-M), transformed zone depth (TZD) and surface roughness were measured. Particle type (p=0.2746), pressure (p=0.5084) and cyclic loading (p=0.1610) did not influence the flexural strength. Except for the air-abraded group with 110 pm Al2O3 at 3.5 bar, all air-abrasion protocols increased the biaxial flexural strength (MPa) (Control.-aged: 1030 +/- 153, Controlaged: 1138 +/- 138; Experimental(aged): 1307 +/- 184-1554 +/- 124; Experiment(alagea): 1308 +/- 118-1451 +/- 135) in both non-aged and aged conditions, respectively. Surface roughness (Ra) was the highest with 110 pm Al0O3(0.84 mu m. F-M values ranged from 0% to 27.21%, higher value for the Rocatec Plus (110 mu m SiO2) and 110 pm Al2O3 groups at 3.5 bar pressure. TZD ranged between 0 and 1.43 mu m, with the highest values for Rocatec Plus and 110 mu m Al2O3 groups at 3.5 bar pressure. (C) 2013 Elsevier Ltd. All rights reserved. (AU)