Dimensional Accuracy and Final Density Measurement of One-, Three-, and Eight-Unit Fixed Dental Frameworks Based on Co-Cr, Manufactured by Using Conventional, Additive and Subtractive Technologies
Keywords:3D printing, Additive technologies, Co-Cr alloys
For the aim of this study, 90 fixed metal frameworks based on Co-Cr were made by using conventional lost vax technique, additive 3D printing done by Selective Laser melting (SLM) technique and subtractive manufacturing using CNC milling. Constructions were produced by the Ceramill Motion 2 milling machine (Amann Girrbach) and Mlab Cusing R 3D printer (GE Additive). Samples were made as one-, three- and eight-unit frameworks based on existing clinical cases. Initial stl. model was built up on a scanned plaster model of three clinical cases by ZirconZahn Modellier software. Evaluation of dimensional accuracy was made by comparison of initial stl. model with a scan of manufactured framework and analyzed by measurement software. Density measurements were made by helium (He) based gas pycnometry. Gained data was statistically analyzed by using T-test and F-test for technologies comparison and non-parametric form of ANOVA: Kruskal Wallis was applied in density evaluation of all samples.
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