title: Loss on drying, calcium concentration and pH of fluoride dentifrices.
abstract: BACKGROUND
  Fluoride dentifrices containing calcium carbonate have advantages such as control of dental plaque and progression of dental caries, also contributing to oral hygiene, represent most dentifrices marketed in Brazil.
  
  
  OBJECTIVE
  To evaluate the physicochemical properties of seven fluoride dentifrices containing calcium carbonate in relation to hydrogen potential (pH), loss on drying and calcium concentration.
  
  
  METHODS
  Data collection was performed using the potentiometric method for pH ranges, gravimetric analysis for loss on drying and atomic absorption spectrometry for the concentration of calcium ions. All tests were performed in triplicate and the analysis was performed entirely at random according to one-way analysis of variance at 5% significance level.
  
  
  RESULTS
  The pH values were alkaline and ranged from 8.67 (Oral-B 123(®)) to 10.03 (Colgate Máxima Proteção Anticáries(®)). The results of loss on drying ranged from 33.81% (Oral-B 123(®)) to 61.13% (Close Up(®)), with significant differences between brands tested. In relation to the calcium content, the highest and lowest concentrations were found in dentifrices Even(®) (155.55 g/kg) and Colgate Ultra Branco(®) (129 g/kg), respectively, with significant difference (P < 0.05).
  
  
  CONCLUSIONS
  Fluoride dentifrices analyzed showed alkaline pH and high levels of loss on drying and calcium concentration. However, these physicochemical characteristics differed according to the different brands tested.
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Arella Cristina Muniz
authors.initials: AC
authors.lastname: Brito
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Lívia Rocha
authors.initials: LR
authors.lastname: Dantas
authors.affiliation: Department of Chemical Engineering, Federal University of Campina Grande, Campina Grande, Brazil.
authors.forename: André Luiz Fiquene
authors.initials: AL
authors.lastname: De Brito
authors.affiliation: Department of Chemical Engineering, Federal University of Campina Grande, Campina Grande, Brazil.
authors.forename: Ana Cristina Silva
authors.initials: AC
authors.lastname: Muniz
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Ianny Alves
authors.initials: IA
authors.lastname: Ramos
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Andreia Medeiros Rodrigues
authors.initials: AM
authors.lastname: Cardoso
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Alidianne Fábia Cabral
authors.initials: AF
authors.lastname: Xavier
authors.affiliation: Department of Dentistry, State University of Paraiba, Paraiba, Brazil.
authors.forename: Alessandro Leite
authors.initials: AL
authors.lastname: Cavalcanti
keywords: Calcium carbonate; chemistry; dentifrices
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