| 3501 Characteristics of thermally oxidized titanium and calcium phosphate deposition | ||
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Y.-J. PARK, H.-J. SONG, Y.-R. LEE, S.-R. NOH, I. KIM, and H.-S. YANG, Chonnam National University, College of Dentistry, Gwangju, South Korea Objectives: This study was purposed to evaluate the changes of micro-morphology, roughness, crystalline structure, and chemical binding structures of titanium surfaces after various thermal oxidation treatments. Moreover, the effects of surface characteristics on the calcium phosphate formation in Eagle's MEM were investigated. Methods: C.P Ti disks were treated at various thermal oxidation conditions to make Ti-530oC, Ti-600oC, Ti-700oC, Ti-800oC, Ti-900oC, and Ti-1000oC groups, and as-received c.p Ti (AS-R) and passivated c.p Ti (PAS) groups were used for comparison. Surface characteristics were evaluated using FE-SEM, profilometer, XRD, and XPS. After immersing each sample in MEM, calcium phosphate (Ca-P) formation was evaluated using FE-SEM, EDX, XRD, and FT-IR. Results: Nano-sized crystallites were observed on the surfaces of Ti-530oC and Ti-600oC. Needle-like crystals were formed on Ti-700oC, and the crystal sizes increased dramatically as the temperature increased higher than 800oC. The roughness was changed with alteration of size and shape of the crystals by the thermal treatment. Anatase and rutile TiO2 structures were coexisted in Ti-700oC and Ti-800oC, whereas only anatase structures were observed in Ti-530oC and Ti-600oC. Only rutile structures were observed in Ti-900oC and Ti-1000oC. On high resolution XPS spectra, surface oxygen concentrations of heat-treated groups were higher than those of AS-R and PAS, and surface hydroxyl group concentration was highest in Ti-600oC. The Ca-P formation in MEM solution was low on AS-R and PAS samples. Ca-P crystals were well observed on heat-treated groups, and its degree of formation and micro-morphology were different by the specimen groups. Conclusion: The crystalline and chemical binding structure, micro-morphology, and surface roughness of titanium oxide were various by the condition of heat treatment. And these differences in surface characteristics affected on the degree of Ca-P formation on Ti samples in MEM solution. Supported by Korea Research Foundation Grant (KRF-2002-041-E00218). | ||
| Seq #360 - Biomechanics/Implant Surfaces 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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