title: Bacterial and dye penetration through interim restorations used during endodontic treatment of molar teeth.
abstract: BACKGROUND
  The purpose of this study was to investigate the association between dye and bacterial penetration through interim restorations used during endodontic treatment.
  
  
  METHODS
  Sixty-four extracted human teeth were used, with 2 teeth each as positive and negative controls. Endodontic access with a mesio-occluso-distal cavity was prepared. Palatal cusps of maxillary molars and buccal cusps of mandibular molars were removed. Cotton was placed over the canals and covered with Cavit. Thirty teeth were restored with Ketac Silver (KS) and 30 with KS reinforced with a stainless steel band (KSSB). Samples were submersed in India ink mixed with brain heart infusion broth containing Streptococcus gordonii. After 3 months of simulated chewing, structural integrity and dye and bacterial penetration were assessed.
  
  
  RESULTS
  Positive controls had both dye and bacterial penetration. Negative controls had no dye or bacterial penetration. All KS restorations debonded, whereas 18 KSSB restorations (60%) debonded. KS restorations were 1.67 times more likely to debond than KSSB restorations (Fisher exact test). KS was 1.3 times more likely to have dye penetration than KSSB (Fisher exact test) and 3 times more likely to have bacterial penetration, although not statistically significant (chi(2) test). Overall, 88.3% of specimens had dye penetration, and 20% had bacterial penetration. This 68.3% difference indicated no association between dye and bacterial penetration (exact McNemar test).
  
  
  CONCLUSIONS
  Stainless steel bands helped maintain structural integrity of KS restorations under masticatory function. Bands helped prevent dye penetration but not bacterial penetration. There was no association between dye and bacterial penetration.
authors: Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
authors: Pattama
authors: P
authors: Chailertvanitkul
authors: Paul V
authors: PV
authors: Abbott
authors: Thomas V
authors: TV
authors: Riley
authors: Namchai
authors: N
authors: Sooksuntisakoonchai
mesh_terms: D002133:Calcium Sulfate; D016722:Cermet Cements; D004396:Coloring Agents; D003738:Dental Cements; D003763:Dental Leakage / Q000175:diagnosis*; D003794:Dental Restoration, Temporary / Q000379:methods*; D003799:Dental Stress Analysis; D004338:Drug Combinations; D006801:Humans; D008409:Mastication; D008434:Matrix Bands; D008963:Molar; D011145:Polyvinyls; D012390:Root Canal Therapy; D013193:Stainless Steel; D015034:Zinc Oxide
chemical_list: D016722:Cermet Cements; D004396:Coloring Agents; D003738:Dental Cements; D004338:Drug Combinations; D011145:Polyvinyls; D013193:Stainless Steel; C020872:Cavit; D015034:Zinc Oxide; D002133:Calcium Sulfate