title: [Effect of surface roughness and titanium dioxide layers on commercially pure titanium on attachment of osteoblasts].
abstract: OBJECTIVE
  To study the effects of surface roughness and titanium dioxide (TiO2) layers on commercially pure titanium (cp-Ti) substrates on attachment of osteoblasts in vitro.
  
  
  METHODS
  250 pure titanium slices were divided into five groups. Osteoblasts were cultured on five cp-Ti substrates of ground, which blasted with 108-130 microm (S1), 216-301 microm (S2), 356-411 microm (S3) TiO2 particles and titanium-sprayed plasma (TPS) surfaces, surfaces prepared by hand grinding with SiC paper to 600 grits served as control (S0). Surface average roughness and the TiO2 film structure was evaluated. For morphology and attachment measurement, osteoblasts were cultured for 1, 4, 12 and 24 h, evaluated by scanning electronic microscope (SEM) observation and MTr assay.
  
  
  RESULTS
  Osteoblasts spread well on the titanium surfaces. Further more, osteoblasts spread more well on S3 surfaces. After 1 and 4 h culture, the number of cells on S3 surfaces was the highest (P < 0.05). The number of cells on S3 surfaces was the same (P > 0.05) as TPS surfaces and higher than other groups (P < 0.05) after 12 and 24 h. The number of cells of all experimental groups were higher than S0 surfaces after 4, 12 and 24 h (P < 0.05).
  
  
  CONCLUSIONS
  It was concluded that the coarse TiO2 particles blasted surface would optimize initial osteoblast responses.
authors.affiliation: Dept. of Prosthodontics, College of Stomatology, Kunming Medical University, Kunming 650031, China.
authors.forename: Yi-li
authors.initials: YL
authors.lastname: Zhou
authors.forename: Zhong-juan
authors.initials: ZJ
authors.lastname: Ding
authors.forename: Ling
authors.initials: L
authors.lastname: Tang
mesh_terms: D002454:Cell Differentiation; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts; D013499:Surface Properties; D014025:Titanium
chemical_list: C009495:titanium dioxide; D014025:Titanium