title: An in situ/ex vivo comparison of the ability of regular and light colas to induce enamel wear when erosion is combined with abrasion.
abstract: OBJECTIVE
  To evaluate whether the type of cola drink (regular or diet) could influence the wear of enamel subjected to erosion followed by brushing abrasion.
  
  
  METHODS
  Ten volunteers wore intraoral devices that each had eight bovine enamel blocks divided into four groups: ER, erosion with regular cola; EAR, erosion with regular cola plus abrasion; EL, erosion with light cola; and EAL, erosion with light cola plus abrasion. Each day for 1 week, half of each device was immersed in regular cola for 5 minutes. Then, two blocks were brushed using a fluoridated toothpaste and electric toothbrush for 30 seconds four times daily. Immediately after, the other half of the device was subjected to the same procedure using a light cola. The pH, calcium, phosphorus, and fluoride concentrations of the colas were analyzed using standard procedures. Enamel alterations were measured by profilometry. Data were tested using two-way ANOVA and Bonferroni test (P<.05).
  
  
  RESULTS
  Regarding chemical characteristics, light cola presented pH 3.0, 13.7 mg Ca/L, 15.5 mg P/L, and 0.31 mg F/L, while regular cola had pH 2.6, 32.1 mg Ca/L, 18.1 mg P/L, and 0.26 mg F/L. The light cola promoted less enamel loss (EL, 0.36 Μm; EAL, 0.39 Μm) than its regular counterpart (ER, 0.72 Μm; EAR, 0.95 Μm) for both conditions. There was not a significant difference (P>.05) between erosion and erosion plus abrasion for light cola. However, for regular cola, erosion plus abrasion resulted in higher enamel loss than erosion alone.
  
  
  CONCLUSIONS
  The data suggest that light cola promoted less enamel wear even when erosion was followed by brushing abrasion.
authors.affiliation: Department of Pediatric Dentistry, Bauru School of Dentistry, University of São Paulo, São Paulo, Brazil. daniriosop@yahoo.com.br
authors.forename: Daniela
authors.initials: D
authors.lastname: Rios
authors.forename: Flávia Cardoso Zaidan
authors.initials: FC
authors.lastname: Santos
authors.forename: Heitor Marques
authors.initials: HM
authors.lastname: Honório
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Magalhães
authors.forename: Linda
authors.initials: L
authors.lastname: Wang
authors.forename: Maria Aparecida
authors.initials: MA
authors.lastname: de Andrade Moreira Machado
authors.forename: Marilia Afonso Rabelo
authors.initials: MA
authors.lastname: Buzalaf
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000818:Animals; D002253:Carbonated Beverages / Q000009:adverse effects*; D002417:Cattle; D030221:Cola; D003743:Dental Enamel / Q000187:drug effects; D019422:Dietary Sucrose; D006801:Humans; D006863:Hydrogen-Ion Concentration; D018709:Statistics, Nonparametric; D013549:Sweetening Agents; D014072:Tooth Abrasion / Q000209:etiology*; D014077:Tooth Erosion / Q000209:etiology*; D014099:Toothbrushing / Q000009:adverse effects*; D055815:Young Adult
chemical_list: D019422:Dietary Sucrose; D013549:Sweetening Agents