ISSN:
0021-9304
Keywords:
implant surface
;
titanium
;
fibronectin
;
atomic force microscopy
;
contact angle
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
,
Technology
Notes:
Protein binding on metallic implant surfaces, such as titanium, is governed by the physico-chemical nature of the metallic surface. Human plasma fibronectin (HPF) is an important matrix glycoprotein that mediates cell and protein attachment to each other or to the extracellular matrix present during wound healing. The objective of this study was to investigate the adsorption of HPF onto polished commercially pure titanium (cpTi) by using atomic force microscopy (AFM) and electron spectroscopy for chemical analysis (ESCA) and to measure the resultant surface contact angle before and after HPF binding. Two types of cpTi disks, one highly polished in our laboratory (HSS) and one commercially prepared (31), were reacted with HPF solutions of varying concentrations (1 μg/mL - 10 ng/mL). ESCA survey spectra of samples coated with 1 μg/mL of fibronectin showed an increase in organic nitrogen and carbon compared with uncoated controls. Contact angle measurements of HSS and 3I cpTi disks showed no significant difference in average contact angle (36.3° ± 3.5 and 39.1° ± 3.1) despite differences in local root mean square (RMS) surface roughness (4.45 ± 0.46 nm and 22.37 ± 4.17 nm) as measured by AFM. Images obtained by AFM showed that 3I specimens were more irregular, with large parallel polishing grooves. Adsorbed HPF appeared in a globular form with an average length of 16.5 ± 1.0 nm, a height of 2.5 ± 0.5 nm, and a width of 9.6 ± 1.2 nm. Fibronectin coating on both HSS and 3I cpTi specimens resulted in a significant increase in hydrophobicity compared to uncoated specimens. These results indicate the significance of HPF on cpTi and may explain how cpTi implants function in situ. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 120-130, 1998.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
Permalink
