Influence of different surface treatments on the fracture toughness of a commercial ZTA dental ceramic

The objective of this study was to investigate how mechanical surface treatments performed for removal of excess of molten glass, influence the fracture toughness of a dental zirconia toughened alumina (In-Ceram® Zirconia). Infiltrated ZTA disks were submitted to three different surface treatments (grinding, sandblasting and grinding + sandblasting + annealing). Fracture toughness was accessed through indentation strength test (IS). X ray diffraction was used to investigate the metastability of tetragonal zirconia particles under all treatments proposed. Kruskall-Wallis non-parametrical test and Weibull statistics were used to analyze the results. Grinding (group 1) introduced defects which decreased the fracture toughness and reliability, presenting the lowest K IC. On the other hand, grinding followed by sandblasting and annealing (group 3) presented the highest K IC. Sandblasting (group 2) presented the highest reliability but lower K IC compared to group 3.

Bibliographic Details

Main Authors:	Silva,Flavio Teixeira da, Zacché,Marcio Alessandro Negrelly, Amorim,Helio Salim de
Format:	Digital revista
Language:	English
Published:	ABM, ABC, ABPol 2007
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000100014
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