title: [The influence of surface roughness on bacteria adhesion on titanium].
abstract: OBJECTIVE
  To investigate the correlation between surface roughness and bacteria adhesion.
  
  
  METHODS
  Surface roughness of four abutments were determined by Talysurf/6p-120 topographer. Ra, Rz, Rp, Rv, Ry and Sm values were gathered. Commercial pure titanium and titanium alloy discs, S. mutans and A. viscosus were used in adhesion experiment.
  
  
  RESULTS
  Ra values (in microns) of the tested abutments were: 0.1556, 0.2073, 0.6976, and 0.3811. No statistical difference was observed in bacterial quantity when Ra < 0.4528 microns and Rz < 3.3882 microns in adhesion experiment.
  
  
  CONCLUSIONS
  The surface roughness of Ra < 0.4 micron and Rz < 3.4 microns is recommended for implant abutment.
authors.affiliation: Department of Microbiology, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Yang
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000190:Actinomyces / Q000502:physiology; D001422:Bacterial Adhesion; D015921:Dental Implants; D013295:Streptococcus mutans / Q000502:physiology; D014025:Titanium
chemical_list: D015921:Dental Implants; D014025:Titanium