Similarities Analysis on Hydroxyapatite-Zirconia Composites
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ABSTRACT:
Hydroxyapatite (Ca10(PO4)6(OH)2) is one of the implants materials with medical applications due to its higher biocompatibility. The hydroxyapatite found complete utilization after proper preparation of composite. The influence of zirconia (ZrO2) on the phase composition and on mechanical properties of hydroxyapatite-zirconia composites has been investigated and reported by Rapacz-Kmita et al [1]. Starting with the experimental data reported in [1], hierarchical cluster analysis methods were applied in order to assess the similarities of four different types of composites. Four classes of composites: HAp (hydroxyapatite), HAp-CGz (CGz = Coarse-Grained Zirconia), HAp-FGZ (FGZ = Fine-Grained Zirconia), and HAp-NGZ (NGZ = Needle-Grained Zirconia) cumulating a total number of sixteen experiments were analyzed. A number of nine quantitative variables were included into analysis: sintering temperature (°C), Vickers hardness (GPa), bending strength (MPa), characteristic strength (MPa), Weibull modulus, anisotropy (%), Young’s modulus (GPa), rigidity modulus (GPa), and Poisson ratio. Data were analyzed with SPSS software (average linkage between groups as cluster method and squared Euclidean distance as measure of analyzed variables). The analysis revealed interesting information regarding similarities between studied hydroxyapatite-zirconia composites.
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