期刊
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
卷 84A, 期 1, 页码 108-116出版社
WILEY
DOI: 10.1002/jbm.a.31422
关键词
bone-titanium integration; osseointegration; osteoblast; osseointegrated implant; chemistry
资金
- NCRR NIH HHS [C06 RR014529] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [C06RR014529] Funding Source: NIH RePORTER
The surface topography and chemistry of titanium are postulated to be two major factors that affect the osseointegration capacity of titanium implants. However, it is extremely difficult to control one factor without changing the other, which prevents the isolation of the genuine effect of one factor. This study aimed to determine whether surface chemistry of titanium alone affects osteoblastic function. Two different titanium surfaces were prepared by sputter depositioning of titanium (Ti; 99.99% purity) or titanium dioxide (TiO2; 99.99% purity) (50-nm thick for each) onto machined commercially pure titanium disks. Rat bone marrow-derived osteoblastic cells were cultured on each of the two surfaces. TiO2 surface showed 4.4 times higher elemental oxygen concentration and higher water wettability than Ti surface. Scanning electron microscopic and atomic force microscopic examination revealed no differences in surface topography and roughness values between the two surfaces. The cell proliferated more on TiO2 than on Ti by up to 60%. Although the expression of collagen I gene increased more rapidly on TiO2 at early culture stage of day 3, the late stage marker genes for osteoblastic differentiation, including osteopontin and osteocalcin, were not modulated between the two cultures. The alkaline phosphatase positive area and mineralized nodule area were approximately two times larger on TiO2 than on Ti. In conclusion, titanium materials having different superficial chemistry, that is, titanium or titanium dioxide, may exert different biological capacity of osteoblasts; titanium dioxide may induce superior osteoconduction, primarily because of the increased osteoblastic proliferation. (c) 2007 Wiley Periodicals, Inc. J Biomed Mater Res 84A: 108-116, 2008.
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