[Study of relationship between (Ca+Zn)/P of pure titanium surface coating and biological activity of osteoblasts].

Purpose: To study osteoblast (MC3T3-E1 cells) adhesion, proliferation and differentiation activity on the surface of pure titanium with different (Ca+Zn)/P ratios, and determine Ca, P, Zn contents offering best biological activity on pure titanium surface.

Methods: In the micro-arc oxidation electrolyte, Ca, P with a certain concentration, and 5 different concentrations of Zn (0, 0.01, 0.

[A clinical retrospective analysis of dental implants replaced in previously failed sites].

Purpose: To evaluate the clinical outcomes as well as related factors of dental implants replaced in previously failed sites.

Methods: A total of 12 patients (15 implants) who received replacement in previously failed sites during January 2005 to December 2011 were included. Outcomes of redo-implants were collected and clinical data was recorded and analyzed regarding risk factors related to redo-implants' survival using SPSS13.