title: The effect of mouthwashes containing biguanides on the progression of erosion in dentin.
abstract: BACKGROUND
  Dental erosion is caused by frequent exposure to acids without the involvement of microorganism. This study analyzed the effect of biguanides (polyhexamethylene biguanide - PHMB and chlorhexidine - CHX) on dentin erosion due to their possible influence on the enzymatic degradation of the demineralized organic matrix.
  
  
  METHODS
  Sixty bovine dentin specimens were prepared. On both sides of their surface, nail varnish was applied to maintain the reference surfaces for the determination of dentin loss. Samples were cyclically de- and remineralized for 6 days. Demineralization was performed with a 0.87 M citric acid solution (6×5 min daily). Thereafter, samples were treated with distilled water (negative control), 0.12% CHX (positive control), 0.07% PHMB, Sanifill Perio Premium™ (0.07% PHMB plus 0.05% NaF), or F solution (0.05% NaF) for 1 min and then subjected to enzymatic challenge for 10 min using a bacterial collagenase (Clostridium hystoliticum, 100 μg/ml). Dentin loss was assessed using profilometry (μm) daily. Data were analyzed using 2-way repeated measures-ANOVA and Bonferroni's test (p < 0.05).
  
  
  RESULTS
  Dentin loss progressed significantly for all groups during the 6 days. After the 3rd day, Sanifill Premium™, CHX, and PHMB significantly reduced dentin erosion compared to control. On the 6th day, the lowest mean (±SD) dentin loss was observed for Sanifill Perio Premium™ (94.4 ± 3.9 μm). PHMB and CHX led to intermediate dentin loss (129.9 ± 41.2 and 135.3 ± 33.5 μm, respectively) that was significantly lower than those found for negative control (168.2 ± 6.2 μm). F (157.4 ± 6.1 μm) did not significantly differ from negative control.
  
  
  CONCLUSIONS
  Sanifill Perio Premium™ mouthwash has a good potential to reduce dentin loss, which might be associated with the presence of PHMB.
authors.forename: Senda
authors.initials: S
authors.lastname: Charone
authors.forename: Cristiane de Almeida Baldini
authors.initials: Cde A
authors.lastname: Cardoso
authors.forename: Melissa Thiemi
authors.initials: MT
authors.lastname: Kato
authors.forename: Paula
authors.initials: P
authors.lastname: Ducati
authors.forename: Rejane
authors.initials: R
authors.lastname: Fukushima
authors.forename: Gabriela
authors.initials: G
authors.lastname: Gennaro
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Magalhães
authors.affiliation: Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Al, Octávio Pinheiro Brisolla, 9-75, Bauru, SP 17012-901, Brazil. mbuzalaf@fob.usp.br.
authors.forename: Marília Afonso Rabelo
authors.initials: MA
authors.lastname: Buzalaf
mesh_terms: D000818:Animals; D000891:Anti-Infective Agents, Local / Q000494:pharmacology*; D001645:Biguanides / Q000494:pharmacology*; D002417:Cattle; D002710:Chlorhexidine / Q000494:pharmacology*; D019343:Citric Acid / Q000009:adverse effects; D003804:Dentin / Q000187:drug effects* / Q000473:pathology; D018450:Disease Progression; D003012:Microbial Collagenase / Q000037:antagonists & inhibitors / Q000494:pharmacology; D009067:Mouthwashes / Q000494:pharmacology*; D012969:Sodium Fluoride / Q000494:pharmacology; D017001:Tooth Demineralization / Q000503:physiopathology; D014077:Tooth Erosion / Q000473:pathology / Q000503:physiopathology*; D014089:Tooth Remineralization
chemical_list: D000891:Anti-Infective Agents, Local; D001645:Biguanides; D009067:Mouthwashes; D019343:Citric Acid; C031233:polihexanide; D012969:Sodium Fluoride; D003012:Microbial Collagenase; D002710:Chlorhexidine