title: Influence of environmental conditions on properties of ionomeric and resin sealant materials.
abstract: OBJECTIVE
  The aim of this study was to determine the effect of environmental conditions on the degradation of ionomeric and resin sealant materials.
  
  
  METHODS
  FluroShield, Vitremer, and Ketac Molar disc-shaped specimens (n=18/material) were prepared, polished, subjected to initial hardness and roughness readings. Six discs of each material were randomly assigned to one of three different storage solutions: 0.3% citric acid (CA), demineralization solution (DE), and remineralization solution (RE). The specimens were individually immersed in 3 mL of the test solutions, which were daily changed. After 15 days of storage, new surface roughness and hardness readings were done. Fluoride release in the solutions was measured within 15 days. Data were analyzed by ANOVA and Tukey's and Contrast tests (alpha=0.05).
  
  
  RESULTS
  The storage in CA increased the roughness of Vitremer and Ketac Molar. A significant reduction in hardness was observed for all materials after storage in all solutions. For all materials, the greatest amounts of fluoride release occurred during the 1st day. FluroShield presented the same patterns of fluoride release in all solutions. Ketac Molar and Vitremer released the highest amounts of fluoride in the CA solution.
  
  
  CONCLUSIONS
  Ionomeric materials are more susceptible to degradation than resin-based materials under acidic conditions. Acidic conditions lead to a higher fluoride release from ionomeric materials.
authors: Department of Pediatric Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
authors: Kamila Rosamilia
authors: KR
authors: Kantovitz
authors: Fernanda Miori
authors: FM
authors: Pascon
authors: Gisele Maria
authors: GM
authors: Correr
authors: Roberta Caroline Bruschi
authors: RC
authors: Alonso
authors: Lidiany Karla Azevedo
authors: LK
authors: Rodrigues
authors: Marcelo Correa
authors: MC
authors: Alves
authors: Regina Maria
authors: RM
authors: Puppin-Rontani
mesh_terms: D000704:Analysis of Variance; D003764:Dental Materials; D006801:Humans; D014089:Tooth Remineralization
chemical_list: D003764:Dental Materials