title: [The influence of Streptococcus sanguis on corrosion resistance of magnetic retainer].
abstract: OBJECTIVE
  To study the effect of Streptococcus sanguis on corrosion resistance of magnetic retainers in which are encapsulated with stainless steel artificial saliva.
  
  
  METHODS
  A magnetic retainer was put in one culture flask,which was filled with artificial saliva.Ten of them were added Streptococcus sanguis suspension,the others were added PBS as control.The culture flasks were cultivated in incubator(36 degrees centigrade). 5 ml suspension was dislodged from each flask at the 3rd, 10th and 20th day. The quantity of Fe(3+) and Mn(2+) was detected.Statistical analysis of paired t test was performed with SPSS10.0 software package.
  
  
  RESULTS
  When Streptococcus sanguis existed, the quantity of Fe(3+) and Mn(2+) was significantly higher than that in the control (P<0.01).
  
  
  CONCLUSIONS
  The existence of Streptococcus sanguis destroys the corrosion resistance of magnetic retainers remarkably.
authors: Dental Hospital of Huangpu District, Shanghai 200002, China.
authors: Wen-Qi
authors: WQ
authors: Hu
authors: Liang-da
authors: LD
authors: Chen
authors: Yi-Jun
authors: YJ
authors: Wang
authors: Dun-Fang
authors: DF
authors: Sun
authors: Dong-Wei
authors: DW
authors: Han
mesh_terms: D003343:Corrosion; D060328:Magnetic Phenomena; D008280:Magnetics; D009968:Orthodontic Appliances, Removable; D013193:Stainless Steel; D013298:Streptococcus sanguis
chemical_list: D013193:Stainless Steel