title: Effect of oxalic acid pre-treatment in restorations of non-carious cervical lesions: A randomized clinical trial.
abstract: BACKGROUND
  Non-carious cervical lesions are usually associated with dentin hypersensitivity. The use of oxalic acid in restorations of these lesions could be beneficial in relieving pain.
  
  
  OBJECTIVE
  To evaluate the use of oxalic acid in restorations of non-carious cervical lesions.
  
  
  METHODS
  A randomized clinical trial.
  
  
  METHODS
  One operator placed 90 restorations in 20 volunteers of both sexes, with at least two lesions to be restored with the techniques: Control - Restoration with total-etch technique and Experimental - Restoration with pretreatment with oxalic acid followed by application of adhesive system. The restorative adhesive system used was XP Bond/Durafill. The restorations were directly assessed by two independent examiners using a modified United States Public Health Service (USPHS) method at baseline, 6 and 12 months, taking into account the following criteria: Retention (R), marginal integrity (MI), marginal discoloration (MD), postoperative sensitivity (S), caries (C), and anatomic form (AF).
  
  
  METHODS
  The data were statistically analyzed using the Fisher exact and McNemar tests. The level of significance was set at 5%.
  
  
  RESULTS
  After 1 year, the results of restorations clinically satisfactory obtained for the control and experimental group respectively were: R (97% / 89%), MI (100% / 100%), MD (100% / 100%), S (100% / 100%), C (100% / 100%), and AF (100% / 100%).
  
  
  CONCLUSIONS
  The use of oxalic acid as an agent of dentin pretreatment did not influence the clinical performance of restorations in non-carious cervical lesions after 1 year.
authors.affiliation: Faculty of Pharmacy, Dentistry and Nursing, Post Graduate Program in Dentistry, Department of Restorative Dentistry, Federal University of Ceara, Brazil.
authors.forename: André Mattos Brito
authors.initials: AM
authors.lastname: de Souza
authors.affiliation: Faculty of Pharmacy, Dentistry and Nursing, Post Graduate Program in Dentistry, Department of Restorative Dentistry, Federal University of Ceara, Brazil ; School of Dentistry, University of Fortaleza, Fortaleza-Ce, Brazil.
authors.forename: Regina Claudia Ramos
authors.initials: RC
authors.lastname: Colares
authors.affiliation: Faculty of Pharmacy, Dentistry and Nursing, Post Graduate Program in Dentistry, Department of Restorative Dentistry, Federal University of Ceara, Brazil.
authors.forename: Juliano Satori
authors.initials: JS
authors.lastname: Mendonça
authors.affiliation: Faculty of Pharmacy, Dentistry and Nursing, Post Graduate Program in Dentistry, Department of Restorative Dentistry, Federal University of Ceara, Brazil.
authors.forename: Lidiany Karla Azevedo
authors.initials: LK
authors.lastname: Rodrigues
authors.affiliation: Faculty of Pharmacy, Dentistry and Nursing, Post Graduate Program in Dentistry, Department of Restorative Dentistry, Federal University of Ceara, Brazil.
authors.forename: Sérgio Lima
authors.initials: SL
authors.lastname: Santiago
keywords: Adhesives; clinical trials; oxalic acid