TY - JOUR ID - TI - The Effect of Pores in Dual Nano Hydroxyapatite Coating on Thermally Oxidized Commercial Pure Titanium: Mechanical and Histological Evaluation AU - Dania Fawzi Mahmood دانيا فوزي محمود AU - Salah A. Mohammed PY - 2016 VL - 28 IS - 1 SP - 17 EP - 25 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background:In this study,TiO2 layer was thermally grown as a diffusion barrier on CP Ti substrate prior to electrophoreticdeposition of HA coatings, to improve the coating’s compatibility also macro and micro pores in nanoHydroxyapatite dual coatings were created and their effect on the bond strength between the bone and implantwas evaluated.Materials and methods: Electrophoretic Deposition technique (EPD) was used to obtain coatings for each one of fourtypes of Hydroxyapatite(HA)on CP Ti screws (micro HA, nano HA, dual nano HA with micro pores, dual nano HA withmacro pores) where carbon particles used as fugitive material to be removed by thermal treatment to createporosity.For examination of the changes occurred on the substrate, SEM, SPM and XRD used, coatings characterizedby XRD, SEM and interfacial shear strength measurements.Results:The results mentioned the formation of rutilenano TiO2 with, SEM showed that the size of pores in HA coatingscorresponded to the size of carbon particles. Statistical analysis of the removal torque tests showed highest means ofthe single nano HA coating at 2 and 4 weeks implantation intervals. Histological analysisrevealed a faster reaction ofbone and higher osteoblasts activity towards thermally oxidized CP Ti implants coated with single nano HA coating.Conclusion:Carbon particles as a fugitive material within nano HA coat produced porosity.Presence of pores 1μ innano HA coats did not achieve highest removal torque values nor highest osteoblasts activity in 2 and 4 weeksimplantation intervals

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