title: Functionally graded bioactive glass coating on magnesia partially stabilized zirconia (Mg-PSZ) for enhanced biocompatibility.
abstract: The coating of magnesia partially stabilized zirconia (Mg-PSZ) with a bioactive glass was investigated for enhancing the bioactivity and bone-bonding ability of Mg-PSZ orthopedic implants. Individual coatings of three different bioactive glasses were prepared by depositing a concentrated suspension of the glass particles on Mg-PSZ substrates, followed by sintering at temperatures between 750 degrees C and 850 degrees C. Two silicate-based glass compositions (designated 13-93 and 6P68), and a borosilicate glass composition (H12) were investigated. The microstructure and adhesive strength of the coatings were characterized, and the in vitro bioactivity of the glasses was compared by measuring their conversion kinetics to hydroxyapatite in an aqueous phosphate solution at 37 degrees C. The 6P68 glass provided the highest adhesive strength (40 +/- 2 MPa) but showed very limited bioactivity, whereas the H12 glass had lower adhesive strength (18 +/- 2 MPa) but the highest bioactivity. A functionally graded coating, consisting of a 6P68 interfacial layer and an H12 surface layer, was developed to provide a coating with high adhesive strength coupled with rapid in vitro bioactivity.
authors.affiliation: Department of Materials Science and Engineering, University of Missouri, Rolla, MO 65409, USA. rahaman@umr.edu
authors.forename: Mohamed N
authors.initials: MN
authors.lastname: Rahaman
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li
authors.forename: B Sonny
authors.initials: BS
authors.lastname: Bal
authors.forename: Wenhai
authors.initials: W
authors.lastname: Huang
mesh_terms: D000268:Adhesiveness; D001672:Biocompatible Materials / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008274:Magnesium / Q000737:chemistry*; D009985:Orthopedics; D011312:Pressure; D017640:Silicates / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D017640:Silicates; D015040:Zirconium; D014025:Titanium; D008274:Magnesium; C028541:zirconium oxide