title: Effect of fluorine incorporation on long-term stability of magnesium-containing hydroxyapatite coatings.
abstract: Dissolution resistance and adhesion strength are two main concerns for long-term stability of surface coated metal implants. In this study, fluorine ions are incorporated into magnesium-containing hydroxyapatite coatings (MgF(y)HA) via sol-gel method to improve the long-term stability of the implants. Surface and interface are studied in terms of phases, depth profiling and chemical bonds by grazing incidence X-ray diffraction, glow discharge optical emission spectroscopy and X-ray photoelectron spectroscopy. The long-term stability is evaluated by dissolution and pull-off test. The results show that fluorine promotes the incorporation of magnesium in HA lattice. The elemental interdiffusion and chemical bonding take place at the coating/substrate interface. Both the dissolution resistance and the adhesion strength are enhanced by fluorine incorporation, thus the long-term stability of the implant is improved.
authors: School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors: Yanli
authors: Y
authors: Cai
authors: Sam
authors: S
authors: Zhang
authors: Xianting
authors: X
authors: Zeng
authors: Deen
authors: D
authors: Sun
references: Acta Biomater. 2007 Mar;3(2):191-7
references: 17142117
references: Biomaterials. 2005 Apr;26(11):1205-10
references: 15475049
references: Calcif Tissue Int. 1992 May;50(5):439-44
references: 1596779
references: Biomaterials. 2003 Dec;24(27):4913-20
references: 14559004
references: Biomaterials. 2005 Nov;26(32):6288-95
references: 15913766
references: J Nutr Biochem. 2004 Dec;15(12):710-6
references: 15607643
references: Biomaterials. 2001 Jun;22(11):1425-31
references: 11336317
references: J Mater Sci Mater Med. 2008 Jul;19(7):2669-77
references: 18270806
references: Biomaterials. 2005 Jun;26(18):3843-51
references: 15626432
references: J Biomed Mater Res. 2002 Oct;62(1):99-105
references: 12124791
references: Biomaterials. 2004 Aug;25(17):3351-8
references: 15020107