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KMID : 0988420030150030189
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Journal of Dental Science (C.N.U.)
2003 Volume.15 No. 3 p.189 ~ p.200
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Surface Characterization of Oxide on Ti Formed under Different Oxidation Conditions and Its Effects on the Formation of Calcium Phosphate
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Abstract
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The objective of this study was to evaluate the changes of micro morphology, roughness and crystalline structure of titanium surface after various oxidation treatments. Moreover, the effect of titanium surface oxide characteristics on the formation of calcium phosphate in Eagle´s MEM.
Commercially pure Ti disks were treated at various thermal conditions of 530℃ (Ti-530), 600℃(Ti-600), 700℃(Ti-700), 800℃(Ti-800), 900℃(Ti-900), and 1000℃(Ti-1000), respectively, and as received cp Ti (AS-R) and passivated cp Ti (PAS) were used as comparison groups. Surface characteristics were investigated using FE-SEM, profilometer and XRD. After immersing each sample in MEM for 7days, calcium phosphate (Ca-P) formation was evaluated using FE-SEM and EDS.
Crystallites of 10~30nm-size were observed on the surface of Ti-530 and Ti-600 samples. Needle-like crystals were formed on Ti-700 samples, and the crystal grain size was increased dramatically as the temperature increased higher than 800℃. The roughness of Ti-530 was higher comparing to AS-R and PAS, and the roughness decreased in the treatment range of 530-700 with dense crystalline oxide formation. However, at treatment temperatures higher than 800℃, the roughness increased and its degree was depended to the size of the crystals. The anatase structures were observed in Ti-530 and Ti-600, and anatase and rutile structures were co-existed in Ti-700 specimen. Only rutile TiO_(2) were observed in Ti-800, Ti-900 and Ti-1000 specimens. The Ca-P formation on AS-R and PAS specimens was low in MEM solution. However, the Ca-P formation was well observed on heat-treatedgroups, and its degree of formation and micro-morphology was different by the specimen groups. The crystalline and chemical structure, micro-morphology, and surface roughness of titanium were various by the conditions of heat treatments, and the grain size and crystal structure of titanium oxide affected on the degree of Ca-P formation on Ti samples in MEM solution
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