title: Wear of two pit and fissure sealants in contact with primary teeth.
abstract: OBJECTIVE
  Wear simulations may provide an indication of the clinical performance of pit-and-fissure sealants when associated with primary teeth as counterbody, restricting the involved variables. The aim of this study was to evaluate wear of dental materials used as pit-and-fissure sealants in contact with primary teeth.
  
  
  METHODS
  A resinous sealant (Fluroshield(®)) and a resin-modified glass ionomer cement (Vitremer(®)) were selected in a post-plate design, using as counterbody primary tooth pins (4 × 4 × 2 mm) at 3 and 10 N vertical load, 1 Hz frequency, 900 wear cycles in artificial saliva (n = 15). Attrition coefficient values were obtained and the material and primary tooth volumes were analyzed. Data were analyzed statistically by ANOVA and Duncan's test (P < 0.05).
  
  
  RESULTS
  Fluroshield(®) presented the highest attrition coefficient values for the 3 N but these values decreased significantly for the 10 N load. The means for volume loss (3 mm) of the different samples after the wear test were not statistically different for the materials. The volume loss values for the primary teeth were statistically different and there was an increase in volume loss with the increase of the load applied in the wear tests.
  
  
  CONCLUSIONS
  Differences were also observed with regard to the surface deformation characteristics. The wear rates of primary tooth enamel vary according to the type of material and the load applied during mastication.
authors: Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
authors: Rodrigo
authors: R
authors: Galo
authors: Department of Pediatric Clinics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
authors: Marta Maria Martins Giamatei
authors: MMMG
authors: Contente
authors: Department of Pediatric Clinics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
authors: Maria Cristina
authors: MC
authors: Borsatto
keywords: Pit and fissure sealant; preventive material; primary teeth; two-body wear