title: Two years survival rate of Class II ART restorations in primary molars using two ways to avoid saliva contamination.
abstract: OBJECTIVE
  To compare the survival rates of Class II Atraumatic Restorative Treatment (ART) restorations placed in primary molars using cotton rolls or rubber dam as isolation methods.
  
  
  METHODS
  A total of 232 children, 6-7 years old, both genders, were selected having one primary molar with proximal dentine lesion. The children were randomly assigned into two groups: control group with Class II ART restoration made using cotton rolls and experimental group using rubber dam. The restorations were evaluated by eight calibrated evaluators (Kappa > 0.8) after 6, 12, 18 and 24 months.
  
  
  RESULTS
  A total of 48 (20.7%) children were considered dropout, after 24 months. The cumulative survival rate after 6, 12, 18 and 24 months was 61.4%, 39.0%, 29.1% and 18.0%, respectively for the control group, and 64.1%, 55.1%, 40.1% and 32.1%, respectively for the rubber dam group. The log rank test for censored data showed no statistical significant difference between the groups (P = 0.07). The univariate Cox Regression showed no statistical significant difference after adjusting for independent variables (P > 0.05).
  
  
  CONCLUSIONS
  Both groups had similar survival rates, and after 2 years, the use of rubber dam does not increase the success of Class II ART restorations significantly.
authors.affiliation: Departamento de Clínica e Odontologia Social, Universidade Federal da Paraíba, Brazil. thiagosaads@hotmail.com
authors.forename: Thiago Saads
authors.initials: TS
authors.lastname: Carvalho
authors.forename: Fábio Correia
authors.initials: FC
authors.lastname: Sampaio
authors.forename: Alexandre
authors.initials: A
authors.lastname: Diniz
authors.forename: Marcelo
authors.initials: M
authors.lastname: Bönecker
authors.forename: Willem Evert
authors.initials: WE
authors.lastname: Van Amerongen
mesh_terms: D002648:Child; D032561:Cotton Fiber; D057087:Dental Atraumatic Restorative Treatment / Q000379:methods*; D019140:Dental Care for Children / Q000379:methods*; D003731:Dental Caries / Q000628:therapy*; D003737:Dental Cavity Preparation / Q000379:methods*; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008963:Molar; D016733:Rubber Dams; D012463:Saliva; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D014094:Tooth, Deciduous; D016896:Treatment Outcome