title: Erosive potential of processed and fresh orange juice on human enamel.
abstract: OBJECTIVE
  The purpose of this study was to analyze the erosive potential of processed and fresh orange juice on human enamel.
  
  
  METHODS
  Sixty enamel slabs, incubated in human saliva to develop acquired pellicle, were exposed to processed and freshly squeezed juice from oranges and lime oranges. Daily erosive cycles were performed by immersing the slabs in the juices for 20 minutes over five days. During the intervals, the samples were immersed in artificial saliva. The pH, titratable acidity (TA), and buffer capacity (β) of the juices were determined. Analysis of variance and Tukey's tests were used to compare the percentage of surface hardness loss and the amount of wear between groups.
  
  
  RESULTS
  The ranges of pH, TA, and β were 3.66 to 3.75, 3.33 to 110 mmol/L, and 2.98 to 40.97 mmol/L × pH, respectively. A similar erosive potential was found for all groups, except for the lime orange juices (P<.05).
  
  
  CONCLUSIONS
  Both processed and freshly squeezed orange juices were erosive to enamel. However, the lime orange juice was acidless and, therefore, not able to produce any significant changes in enamel.
authors.affiliation: Department of Endodontics, Prosthodontics, and Operative Dentistry, University of Maryland Dental School, Baltimore, Md., USA. maryannesmelo@yahoo.com.
authors.forename: Mary A S
authors.initials: MA
authors.lastname: de Melo
authors.affiliation: Edson Queiroz Foundation, University of Fortaleza, Fortaleza, Ceará, Brazil.
authors.forename: Vanara F
authors.initials: VF
authors.lastname: Passos
authors.affiliation: Department of Dentistry, Faculty of Pharmacy, Dentistry and Nursing; at the Federal University of Ceará, Fortaleza, Ceará, Brazil.
authors.forename: Juliana P M
authors.initials: JP
authors.lastname: Lima
authors.affiliation: Federal University of Ceará, Fortaleza, Ceará, Brazil.
authors.forename: Gabriela C
authors.initials: GC
authors.lastname: Parente
authors.affiliation: Department of Dentistry, Faculty of Pharmacy, Dentistry and Nursing; at the Federal University of Ceará, Fortaleza, Ceará, Brazil.
authors.forename: Lidiany K A
authors.initials: LK
authors.lastname: Rodrigues
authors.affiliation: Department of Dentistry, Faculty of Pharmacy, Dentistry and Nursing; at the Federal University of Ceará, Fortaleza, Ceará, Brazil.
authors.forename: Sérgio L
authors.initials: SL
authors.lastname: Santiago
mesh_terms: D001628:Beverages; D032084:Citrus sinensis; D003743:Dental Enamel / Q000737:chemistry / Q000187:drug effects*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D012464:Saliva, Artificial; D013499:Surface Properties; D014077:Tooth Erosion / Q000139:chemically induced*
chemical_list: D012464:Saliva, Artificial