Chulalongkorn University Dental Journal

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Objective To investigate the surface characteristics of anodized commercially pure titanium grade 2 prepared in different electrolytes and the relationship between surface properties and calcium phosphate formation immersed in simulated body fluid solution. Materials and methods Commercially pure titanium grade 2 plates sized 10 x 15 x 0.5 mm3 were divided into three groups, 10 specimens for each group, including control. Potentiostatic anodization was performed for 30 minutes at room temperature. Group I specimens were anodized in 0.5 M H3PO4 with potential of 200 V and Group II specimens were anodized in 1 M NaOH solution with potential of 20 V. All specimens were then immersed in simulated body fluid (SBF) solution for 7, 14 and 28 days at 36.5°C, pH 7.4. The x-ray diffraction, SEM and EDS analysis were used to investigate the surface characteristics of anodized titanium before and after immersion in SBF. Results After anodic oxidation, the uniform structure consisting of numerous pores was observed on the surface of titanium specimens in H3PO4 solution, while irregular surface consisting of pores and elevated surface on titanium specimens in NaOH solution. Using XRD analysis, anatase crystalline structure was found on titanium anodized in H3PO4, but rutile crystalline structure was observed on titanium anodized in NaOH. After immersion in SBF, only titanium prepared in electrolyte of NaOH immersed in SBF for 28 days showed calcium phosphate formation. However, no calcium phosphate formation could be observed in any group of titanium specimens anodized in H3PO4 including control group. Conclusion Crystalline structure of anodized titanium surface may influece partly on the ability of calcium phosphate formation after immersion in simulated body fluid solution.



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