Malaysian
Journal of Analytical Sciences Vol 20 No 3 (2016): 642 - 650
DOI:
http://dx.doi.org/10.17576/mjas-2016-2003-25
FABRICATION OF Y-TZP FOR DENTAL
CROWNS APPLICATIONS BY COMBINING SLIP CASTING AND COLD ISOSTATIC PRESSING
(Pembangunan Y-TZP untuk Aplikasi Korona Gigi
melalui Penggabungan Kaedah Penuangan Buburan dan Penekanan Isostatik Sejuk)
Chin Chuin Hao1, Andanastuti Muchtar1,2*,
Che Husna Azhari1, Masfueh Razali3, Mohamed Aboras1
1Department of Mechanical and Materials Engineering,
Faculty of Engineering and Built Environment
2Fuel Cell Institute, Universiti Kebangsaan Malaysia
Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia.
3Periodontology Department, Faculty of Dentistry,
Universiti
Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.
*Corresponding author: muchtar@ukm.edu.my
Received: 5
February 2016; Accepted: 22 April 2016
Abstract
Yttria-stabilized
tetragonal zirconia polycrystalline (Y-TZP) is a popular material for dental
restoration because of its outstanding mechanical properties and
biocompatibility. Cold isostatic pressing (CIP) and slip casting are among
several consolidation methods for Y-TZP. These methods produce Y-TZP with high
mechanical properties. This study aims to enhance the mechanical properties of
Y-TZP by combining slip casting and CIP. Y-TZP samples were fabricated using
CIP, slip casting, and their combination. Subsequently, the green bodies of the
samples were sintered at 1600 °C. Their mechanical properties (density and
hardness) were tested and their microstructures were scrutinized under a
scanning electron microscope. Compared with the other two methods, the combined
method significantly improved the mechanical properties of Y-TZP. In addition,
the combined method also produced a compact and homogeneous microstructure.
Therefore, the combination of slip casting and CIP is recommended in the
production of Y-TZP with high mechanical properties for dental crown
applications.
Keywords: cold isostatic pressing, slip casting,
colloidal processing
Abstrak
Polikristal tetragon zirkonia
yang distabilkan dengan yttria (Y-TZP) merupakan bahan restorasi pergigian yang
popular disebabkan sifat mekanik dan bioserasi yang baik. Kaedah penekanan
isostatik sejuk (CIP) dan penuangan buburan adalah kaedah pengukuhan yang lazim
digunakan untuk Y-TZP. Kedua-dua kaedah ini berupaya menghasilkan Y-TZP yang
bersifat mekanik tinggi. Kajian ini bertujuan meningkatkan sifat mekanik Y-TZP
melalui gabungan penuangan buburan dan CIP. Sampel Y-TZP dihasilkan melalui
kaedah penuangan buburan, CIP dan gabungan kedua-dua kaedah tersebut.
Seterusnya, jasad anum yang terhasil disinter pada suhu 1600 ˚C. Sifat mekanik
sampel Y-TZP (ketumpatan dan kekerasan) diuji dan mikrostruktur juga diteliti di
bawah mikroskop elektron imbasan. Kaedah gabungan didapati meningkatkan sifat
mekanik Y-TZP dengan ketara. Selain itu, mikrostruktur yang padat dan homogen
juga diperolehi. Justeru, gabungan kaedah penuangan buburan dan CIP dicadangkan
untuk penghasilan Y-TZP yang bersifat mekanik tinggi dalam aplikasi korona
gigi.
Kata kunci: penekanan
isostatik sejuk, penuangan buburan, pemprosesan berkoloid
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