RESPONSE OF OSTEOBLASI-LIKE CELLS ON TITANIUM SURFACE TREATMENT

  • Roh Hyun-Ki (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Heo Seong-Joo (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Chang Ik-Tae (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Koak Jai-Young (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Han Jong-Hyun (Yonsei University, Yongdong Sevrance Hospital) ;
  • Kim Yong-Sik (University of Ulsan, Asan Medical Center) ;
  • Yim Soon-Ho (Sungkyunkwan University, School of Medicine)
  • 발행 : 2003.12.01

초록

Statement of problem. Titanium is the most important material for biomedical and dental implants because of their high corrosion resistance and good biocompatibility. These beneficial properties are due to a protective passive oxide film that spontaneously forms on the surface. Purpose. The purpose of this study was to evaluate the responses of osteoblast-like cells on different surface treatments on Ti discs. Material and Methods. Group 1 represented the machined surface with no treatment. Group 2 surfaces were sandblasted with $50{\mu}m\;Al_2O_3$ under $5kgf/cm^2$ of pressure. Groups 3 and 4 were sandblasted under the same conditions. The samples were treated on a titanium oxide surface with reactive sputter depositioning and thermal oxidation at $600^{\circ}C$ (Group 3) and $800^{\circ}C$ (Group 4) for one hour in an oxygen environment. The chemical composition and microtopography were analyzed by XRD, XPS, SEM and optical interferometer. The stability of $TiO_2$ layer was studied by petentiodynamic curve. To evaluate cell response, osteoblast extracted from femoral bone marrow of young adult rat were cultured for cell attachment, proliferation and morphology on each titanium discs. Results and Conclusion. The results were as follows : 1. Surface roughness values were, from the lowest to the highest, machined group, $800^{\circ}C$ thermal oxidation group, $600^{\circ}C$ thermal oxidation group and blasted group. The Ra value of blasted group was significantly higher than that of $800^{\circ}C$ thermal oxidation group (P=0.003), which was not different from that of $600^{\circ}C$ thermal oxidation group (P<0.05). 2. The degree of cell attachment was highest in the $600^{\circ}C$ thermal oxidation group after four and eight hours (P<0.05), but after 24 hours, there was no difference among the groups (P>0.05). 3. The level of cell proliferation showed no difference among the groups after one day, three days, and seven days (P>0.05). 4. The morphology and arrangement of the cells varied with surface roughness of the discs.

키워드

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