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Volume 21 , Issue 2
March/April 2006

Pages 203211

Effects of Fluoride-Modified Titanium Surfaces on Osteoblast Proliferation and Gene Expression

Zakiah M. Isa, BDS, PhD / Galen B. Schneider, DDS, PhD / Rebecca Zaharias, BS / Denise Seabold, BA / Clark M. Stanford, DDS, PhD

PMID: 16634490

Purpose: The objective of this study was to test the hypothesis that fluoride-modified titanium surfaces would enhance osteoblast differentiation. Osteoblast growth on a moderately rough etched fluoride-modified titanium surface (alteration in cellular differentiation) was compared to osteoblast growth on the same surface grit-blasted with titanium dioxide. The potential role of nanometer-level alterations on cell shape and subsequent differentiation was then compared. materials and methods: Human embryonic palatal mesenchymal (HEPM) cultures were incubated on the respective surfaces for 1, 3, and 7 days, followed by analysis for cell proliferation, alkaline phosphatase (ALP) -specific activity, and mRNA steady-state expression for bone-related genes (ALP, type I collagen, osteocalcin, bone sialoprotein [BSP] II, Cbfa1, and osterix) by real-time polymerase chain reaction (PCR). Results: The different surfaces did not alter the mRNA expression for ALP, type I collagen, osterix, osteocalcin, or BSP II. However, Cbfa1 expression on the fluoride-modified titanium surface was significantly higher (P < .001) at 1 week. The number of cells on this surface was 20% lower than the number of cells on the surface TiO2-blasted with 25-mm particles but not significantly different from the number of cells on the surface TiO2-blasted with 125-mm particles. Cells grown on all the titanium surfaces expressed similar levels of ALP activity. Conclusions: The results indicated that a fluoride-modified surface topography, in synergy with surface roughness, may have a greater influence on the level of expression of Cbfa1 (a key regulator for osteogenesis) than the unmodified titanium surfaces studied. (Basic Science)

Int J Oral Maxillofac Implants 2006;21:203211
Key words: Cbfa1, dental implants, osseointegration, osteoblasts

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