title: Effect of surface roughness of porcelain on adhesion of bacteria and their synthesizing glucans.
abstract: BACKGROUND
  In some instances of porcelain restoration, refinishing is inevitable. In terms of plaque accumulation on porcelain, refinishing could be a substitute method for glazing.
  
  
  OBJECTIVE
  This study compared the amount of adhesion of plaque components (bacterial cells and glucans) on porcelain disks with various degrees of surface roughness to assess the effects of surface roughness on the amount of plaque accumulation.
  
  
  METHODS
  Radiolabeled cell suspensions were incubated with porcelain disks for 3, 8, and 24 hours at 37 degrees C, and the amounts of adhered cells and glucans were measured by using a liquid scintillation method.
  
  
  RESULTS
  The amount of cells and glucans adhered on porcelain increased with incubation time. The surface roughness value and the amount of plaque adhesion decreased with the increase in polishing level. However, the greatest amount of plaque was adhered on glazed surfaces, although their surfaces were smoother than the surfaces polished with 120- or 600-grit abrasive papers.
  
  
  CONCLUSIONS
  With the exception of glazed surfaces, a positive correlation between surface roughness and the amount of plaque accumulation was observed. Repolishing with a diamond paste would not induce problems of plaque accumulation, compared with an intact glazed surface.
authors.affiliation: Osaka University Faculty of Dentistry, Osaka, Japan. kkawai@dent.osaka-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Kawai
authors.forename: M
authors.initials: M
authors.lastname: Urano
authors.forename: S
authors.initials: S
authors.lastname: Ebisu
mesh_terms: D000704:Analysis of Variance; D001422:Bacterial Adhesion; D003773:Dental Plaque / Q000382:microbiology; D003775:Dental Polishing / Q000379:methods / Q000706:statistics & numerical data; D003776:Dental Porcelain / Q000737:chemistry*; D005936:Glucans / Q000096:biosynthesis*; D006244:Hardness; D006801:Humans; D066298:In Vitro Techniques; D016986:Streptococcus sobrinus / Q000378:metabolism / Q000472:pathogenicity*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D005936:Glucans; D003776:Dental Porcelain