Abstract. Dental composite as restorative dental materials can be reinforced using ceramic fillers. Homogeneous distribution of filler particles shall improve its mechanical properties. This paper presents the results of the preliminary study on the ZrO 2 -Al 2 O 3 -SiO 2 ceramic fillers made from Indonesian natural sand that can increase the mechanical properties of dental composite. The synthesis was done using zirconium silicate sand (ZrSiO 4 ) and aluminium oxide (Al 2 O 3 ) precursors, which dissolved together with 70:30 weight ratios. Two types of sand were used: (1) manufactured sand (mesh #80) and (2) natural sand (mesh #400). The samples then heated in the furnace at 1100 0 C for 8 hours. The morphological characterization was then evaluated using JEOL Scanning Electron Microscope (SEM) for the surface structure that analyze particles size and distribution. Ceramic fillers made from natural sand is homogenous, well distributed with average particle size of 5-10 μm. Comparably, ceramic filler made from the manufactured sand is heterogeneous, poorly distributed and appear as agglomerates with average particle size are 30-50 μm. The results suggest that ceramic fillers made from natural sand demonstrate better character to represent as a functional restorative dental material.
Pasir zirkon (ZrSiO4) merupakan mineral alam yang tersusun atas zirkonia (ZrO2) dan silika (SiO2) yang berikatan dengan stabil. Zirkonia adalah salah satu material keramik kedokteran gigi yang banyak digunakan karena memiliki sifat mekanis dan biokompatibilitas yang tinggi. Zirkonia dapat dikombinasikan dengan silika dan alumina untuk membentuk suatu bahan pengisi komposit dengan sifat mekanis dan estetis yang dapat disesuaikan dengan sifat gigi kodrat. Tujuan dari penelitian ini adalah untuk menghasilkan bahan bahan pengisi komposit alternatif di bidang kedokteran gigi yang berasal dari pasir zirkon alam untuk dijadikan bahan bahan pengisi komposit. Metode: Jenis penelitian yang dilakukan adalah eksperimental laboratoris untuk mensintesis dan mengkarakterisasi partikel ZrO2-Al2O3-SiO2 dari bahan baku alam berupa pasir zircon dengan reaksi geopolimerisasi dan proses pemanasan suhu tinggi. Aktivator yang digunakan adalah larutan NaOH 3 mol dengan temperatur pemanasan 1100°C pada lama pemanasan 4 jam, 6 jam, dan 8 jam. Hasil: Hasil analisis uji X-Ray Diffraction (XRD) menunjukkan jumlah zirkonia berstruktur tetragonal terbesar ada pada sampel pemanasan 8 jam, yaitu 24%. Hasil analisis uji Energy Dispersive Spectroscopy (EDS) menunjukkan rasio komposisi zirkonia-alumina-silika dengan nilai zirkonia tertinggi ada pada sampel pemanasan 8 jam, yaitu 55,7; 23,6; 20,6. Hasil analisis mikrograf Scanning Electron Microscope (SEM) menunjukkan morfologi permukaan dan partikel yang tidak beraturan dan beraglomerasi. Simpulan: Sintesis partikel zirkonia-alumina-silika (ZrO2-Al2O3-SiO2) dari pasir zirkon alam dengan pemanasan 8 jam ditinjau dari jumlah zirkonia berstruktur tetragonal memadai digunakan sebagai bahan pengisi komposit berdasarkan uji XRD dan EDS, namun pada uji SEM partikel berbentuk tidak beraturan dan beraglomerasi. Kata kunci: Pasir zirkon, zirkonia-alumina-silika, geopolimerisasi, bahan pengisi komposit Synthesis of zirconia-alumina-silica particles (ZrO2-Al2O3-SiO2) from natural zircon sand as dental composite fillers ABSTRACT Introduction: Zircon sand (ZrSiO4) is natural mineral sand which is composed of zirconia (ZrO2) and silica (SiO2) that bind in a stable condition. Zirconia is one of a ceramic that is widely used in dentistry because of its high biocompatibility and good mechanical properties. Zirconia can be combined with silica and alumina to form a bahan pengisi composite material with its esthetics and mechanical properties that can be adjusted to real tooth properties. Methods: This study focuses on a synthesis of zirconia-aluminasilica (ZrO2-Al2O3-SiO2) from natural zircon sand using a geopolymerization method and a heat treatment in high temperature. Activator used in this method is 3 mol NaOH solutions. A temperature that is used to heat is 1100° C for 4 hours, 6 hours, and 8 hours. Results: Analysis result of X-ray Diffraction (XRD) indicates that a sample with 8 hours heating time has a greatest amount of tetragonal zirconia: 24%. An analysis result of Energy Dispersive Spectroscopy (EDS) indi...
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