Biaxial flexural strength of three ceramic oxide core materials
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Date
Authors
Dullabh, Hemant D.
Herbst, Dirk
Sykes, Leanne M.
Biseswar, Nadir
Journal Title
Journal ISSN
Volume Title
Publisher
South African Dental Association
Abstract
INTRODUCTION :
Brittleness and low strength render conventional ceramic
systems unsuitable for routine restorative use in molars.
Modern, high-strength ceramic core materials such as
high purity aluminum oxide (Al2O3) and yttrium - partially
stabilized zirconia (Y-PSZ) have been designed for
aesthetic, metal-free, all-ceramics in posterior teeth.
AIMS AND OBJECTIVES :
To compare the biaxial flexural strengths 1. of these two
core materials.
2. To compare the strengths of Y-PSZ samples produced
by two manufacturers.
MATERIALS AND METHODS :
Three groups of discs measuring 16mm diameter and
2mm thickness were prepared for each of the sample
materials, high purity Al2O3, commercially available as
Turkom-Cera, and Y-PSZ, commercially available as
Cercon and LAVA. The Biaxial flexural strengths were
measured using a Zwick Z010 Material Testing Machine.
Reliability was compared using Weibull Moduli.
RESULTS :
Mean strengths for LAVA, Cercon and Turkom-Cera were
866.44, 586.92, 155.71 MPa respectively. Statistically significant
differences were shown between the mean values.
DISCUSSION AND CONCLUSION :
This project showed that the samples of Y-PSZ had higher
biaxial flexural strengths than those of high purity Al2O3. The
biaxial flexural strengths of Y-PSZ, sourced from two manufacturers,
are significantly different. It is suggested that Y-PSZ
is suitable and indicated for restorative use in molar regions.
Description
Keywords
High-strength ceramics, Tensile stress, Biaxial flexural strength, Ceramic oxide core materials
Sustainable Development Goals
Citation
Dullabh, H.D., Herbst, D., Sykes, L.M. & Biseswar, N. 2017, 'Biaxial flexural strength of three ceramic oxide core materials', South African Dental Journal, vol. 72, no. 2, pp. 56-61.