TY - JOUR ID - TI - Electrophoretic deposition of Hydroxyapatite on tapered Ti-6Al-7Nb dental implants: Biomechanical evaluation in rabbits AU - Yaarob M. Salman يعرب سلمان AU - Raghdaa K. Jassim رغداء جاسم AU - Thair L. Al-Zubaydi ثائر الزبيدي PY - 2011 VL - 23 IS - special issue SP - 36 EP - 41 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: Advances in implant design have often focussed on altering the micro-topography and chemistry ofthe implant surface. This study was done to evaluate the effect of Hydroxyapatite (HA) coating on the bond strengthbetween the bone and tapered screw-shaped Ti-6Al-7Nb dental implants.Materials and methods: Electrophoretic deposition technique (EPD) was used to obtain a uniform coating ofHydroxyapatite on the tapered Ti-6Al-7Nb screws. Structural investigations were carried out on the HA coatingsurface of the Ti.6Al.7Nb alloy using X-ray diffraction (XRD). The in vivo studies were performed by the implantation oftapered screw-shaped uncoated and coated implants in the tibia of white New Zealand rabbits. To understand thebone-implant interface, biomechanical test was carried out after 2, 6 and 18 weeks healing periods.Results: The XRD result shows that the ceramic layer consists of highly crystalline form of hydroxyapatite and thecrystalline HA belong to characteristic peaks of (211) at 2ƒÆ 31.7o with the hexagonal symmetry. Biomechanical resultshows that there was increased mechanical strength (torque value) of bone-implant interface with time, and thegreater increase in the torque value was noticed between 6 and 18 weeks. Also the result shows that the taperedimplant coated with HA have higher removal torque values than uncoated one in different time intervals.Conclusion: The electrophoretic deposition (EPD) is a good alternative coating technique for dental implant. HAcoated implants demonstrate high torque value and early healing than uncoated implants, which is very importantin early loading of the implant

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