Fabrication of Y-TZP for Dental Crowns Applications by Combining Slip Casting and Cold Isostatic Pressing

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