title: Protective effect of green tea on dentin erosion and abrasion.
abstract: OBJECTIVE
  This in situ study evaluated the protective effect of green tea on dentin erosion (ERO) and erosion-abrasion (ABR).
  
  
  METHODS
  Ten volunteers wore intraoral palatal appliances with bovine dentin specimens subjected to ERO or ERO + toothbrushing abrasion performed immediately (ERO+I-ABR) or 30 min after erosion (ERO+30-min-ABR). During 2 experimental 5-day crossover phases, the volunteers rinsed with green tea or water (control, 1 min) between each erosive (5 min, cola drink) and abrasive challenge (30 s, toothbrushing), 4x/day. Dentin wear was measured by profilometry.
  
  
  RESULTS
  The green tea reduced the dentin wear significantly for all conditions compared to control. ERO+I-ABR led to significantly higher wear than ERO, but it was not significantly different from ERO+30-min-ABR. ERO+30-min-ABR provoked significant higher wear than ERO, only for the placebo treatment.
  
  
  CONCLUSIONS
  From the results of the present study, it may be concluded that green tea reduces the dentin wear under erosive/abrasive conditions.
authors.affiliation: University of São Paulo, Bauru, SP, Brazil.
authors.forename: Melissa Thiemi
authors.initials: MT
authors.lastname: Kato
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Magalhães
authors.forename: Daniela
authors.initials: D
authors.lastname: Rios
authors.forename: Angélica Reis
authors.initials: AR
authors.lastname: Hannas
authors.forename: Thomas
authors.initials: T
authors.lastname: Attin
authors.forename: Marília Afonso Rabelo
authors.initials: MA
authors.lastname: Buzalaf
mesh_terms: D000328:Adult; D000818:Animals; D002253:Carbonated Beverages / Q000009:adverse effects; D002417:Cattle; D018592:Cross-Over Studies; D003804:Dentin / Q000473:pathology; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D020011:Protective Agents / Q000627:therapeutic use*; D013662:Tea; D014072:Tooth Abrasion / Q000517:prevention & control*; D014077:Tooth Erosion / Q000517:prevention & control*; D014099:Toothbrushing / Q000295:instrumentation; D014867:Water; D055815:Young Adult
chemical_list: D020011:Protective Agents; D013662:Tea; D014867:Water