title: The effect of different titanium and hydroxyapatite-coated dental implant surfaces on phenotypic expression of human bone-derived cells.
abstract: Roughened titanium (Ti) surfaces have been widely used for dental implants. In recent years, there has been the tendency to replace Ti plasma-sprayed surfaces by sandblasted and acid-etched surfaces in order to enhance osseous apposition. Another approach has been the utilization of hydroxyapatite (HA)-coated implants. This study examines the effect of two roughened Ti dental implant surfaces on the osteoblastic phenotype of human bone-derived cells (HBDC) and compares this behavior to that for cells on an HA-coated surface. Test materials were an acid-etched and sandblasted Ti surface (Ti-DPS), a porous Ti plasma-sprayed coating (Ti-TPS), and a plasma-sprayed porous HA coating (HA). Smooth Ti machined surfaces served as control (Ti-ma). HBDC were grown on the substrata for 3, 7, 14, and 21 days, counted and probed for various bone-related mRNAs and proteins (type I collagen, osteocalcin, osteopontin, osteonectin, alkaline phosphatase, and bone sialoprotein). All dental implant surfaces significantly affected cellular growth and the temporal expression of an array of bone-related genes and proteins. HA-coated Ti had the most effect on osteoblastic differentiation inducing a greater expression of an array of osteogenic markers than recorded for cells grown on Ti-DPS and Ti-TPS, thus suggesting that the HA-coated surface may possess a higher potency to enhance osteogenesis. Furthermore, Ti-DPS surfaces induced greater osteoblast proliferation and differentiation than Ti-TPS.
authors.affiliation: Department of Experimental Dentistry, University Hospital Benjamin Franklin, Free University of Berlin, Assmannshauser Str. 4-6, 14197 Berlin, FRG. Christine.Knabe@medizin.fu-berlin.de
authors.forename: Christine
authors.initials: C
authors.lastname: Knabe
authors.forename: Cameron Rolfe
authors.initials: CR
authors.lastname: Howlett
authors.forename: Falk
authors.initials: F
authors.lastname: Klar
authors.forename: Hala
authors.initials: H
authors.lastname: Zreiqat
mesh_terms: D000293:Adolescent; D015415:Biomarkers; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000378:metabolism*; D015921:Dental Implants; D005260:Female; D006801:Humans; D006882:Hydroxyapatites / Q000737:chemistry / Q000378:metabolism*; D017403:In Situ Hybridization; D008422:Materials Testing; D010006:Osteoblasts / Q000166:cytology / Q000502:physiology*; D010641:Phenotype; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry / Q000378:metabolism*
chemical_list: D015415:Biomarkers; D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D006882:Hydroxyapatites; D014025:Titanium