PMID: 9638535Jun 25, 1998Paper

Differences in microstructural characteristics of dense HA and HA coating

Journal of Biomedical Materials Research
M OgisoT Matsumoto

Abstract

Two implant types of hydroxyapatite (HA) currently are available for dental implants: dense HA-cemented titanium (Ti) and HA-coated. It has been shown in previous reports that there are differences in the chemical and mechanical stabilities between the dense HA and HA coated. The differences are thought to be due to structural differences between the two ceramic types. The aim of this study was to investigate the differences in microstructural characteristics of currently available dense HA and HA coated implants before implantation and at periods of 3 weeks and 10 months after implantation in canine bone. X-ray diffractometry, infrared analysis, transmission electron microscopy, and energy dispersive X-ray analysis were used. The dense HA is composed of crystal grains, with a well crystallized structure of HA, closely bound to each other and approximately 0.4-0.6 micron in size. Implantation did not change the original sintered structure of the dense HA. The HA coating was composed of an amorphous phase with a Ca/P ratio of 1.46 and a crystal phase consisting of oxyhydroxyapatite, tricalcium phosphate, tetracalcium phosphate, and CaO, with a Ca/P ratio of 1.57. In the amorphous phase, compared to other portions in the amorphou...Continue Reading

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Citations

Jun 14, 2003·Medical & Biological Engineering & Computing·R L PriceT J Webster
Nov 24, 2006·Journal of Materials Science. Materials in Medicine·F N OktarJ M F Ferreira
Jun 15, 2007·Journal of Medical Engineering & Technology·H S Hedia
Sep 11, 2002·Journal of Biomedical Materials Research·P SepulvedaB König

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