KMID : 0362420060440050617
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Journal of Korean Academy of Prosthodontics 2006 Volume.44 No. 5 p.617 ~ p.627
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STUDY ON THE ENHANCING MICRO-ROUGHNESS OF POROUS SURFACED DENIAL IMPLANT THROUGH ANODIZATION
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Yoon Tae-Ho
Song Kwang-Yeob
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Abstract
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Statement of problem: HA has been used as a coating material on Ti implants to improve osteoconductivity. However. it is difficult to form uniform HA coatings on implants with complex surface geometries using a plasma spraying technique.
Purpose: To determine if Ti6Al4V sintered porous-surfaced implants coated with HA sol-gel coated and hydrothermal treated would accelerate osseointegration.
Materials and Methods: Porous implants which were made by electric discharge were used in this study. Implants were anodized and hydrothermal treatment or HA sol-gel coating was performed. Hydrothermal treatment was conducted by high pressure steam at 300¡É for 2 hours using a autoclave. To make a HA sol, triethyl phosphite and calcium nitrate were diluted and dissolved in anhydrous ethanol and mixed. Then anodized implant were spin-coated with the prepared HA sols and heat treated. Samples were soaked in the Hanks solution with pH 7.4 at 37¡É for 6 weeks. The microstructure of the specimens was observed with a scanning electron microscope (SEM), and the composition of the surface layer was analyzed with an energy dispersive spectroscope (EDS).
Results: The scanning electron micrographs of HA sol-gel coated and hydrothermal treated surface did not show any significant change in the size or shape of the pores. After immersion in Hanks¡¯¡¯ solution the precipitated HA crystals covered macro- and micro-pores The precipitated Ca and P increased in Hanks¡¯¡¯ solution that surface treatment caused increased activity.
Conclusion: This study shows that sol-gel coated HA and hydrothermal treatment significantly enhance the rate of HA formation due to the altered surface chemistry.
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KEYWORD
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Porous implant, Anodizing, HA sol-gel coating, Hydrothermal treatment
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