TJ788 : Design and fabrication of ceramic dental implant using Selective Laser Sintering (SLS) method
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2022
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The purpose of this study is to develop a selective indirect laser sintering dental implant consisting of zirconia stabilized with 3% mol yttria. In this method, yttria-zirconia and an adhesive made of cast wax, beeswax, and stearic acid are uniformly mixed at a temperature of 105 ºC by a mechanical stirrer; After the mill has cooled down, it is sieved with a 170 mesh, and the percentage of adhesive and the initial variables of sintering were obtained during preliminary tests. The primary green parts produced by this method are subjected to slurry pressure infiltration and isostatic pressure to increase the density, and then two stages of debinding - pre sintering (550-950 ºC) and final sintering (1580 ºC) are performed. At this point, the ideal composite composition was obtained baxsed on the component quality and density. The Taguchi's L27 standard orthogonal array was then used to conduct tests in order to determine the ideal values for the laser scanning speed, scan spacing , scanning pattern, and laxyer height, as well as the best pressure for the cold isostatic press and slurry presure infiltration . The optimal printing parameters were chosen to create an analog dental implant sample by measuring the density and Vickers hardness of the produced items. Once the implants were created, the Vickers test and density measurement were carried out. The items produced had a density of 5.5 g/cm3 and a hardness of 1148 HV0.5.
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#Keywords: implant #indirect sls #additive manufacturing #wax #zirconia Keeping place: Central Library of Shahrood University
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