title: Erosion effects on chemical composition and morphology of dental materials and root dentin.
abstract: OBJECTIVE
  This work aims to study the erosion on restorative materials and on surrounding dentin. Fifty root dentin samples were obtained from bovine incisors.
  
  
  METHODS
  Twenty samples were not restored and thirty received cavity preparations. Samples were assigned to five groups: G1, G2: sound dentin (D); G3: composite resin (CR); G4: resin-modified glass-ionomer cement (RMGIC); G5: glass-ionomer cement (GIC). The samples of groups 2-5 were submitted to six cycles (demineralization-remineralization). Samples were analyzed by micro energy-dispersive X-ray fluorescence spectrometry (μ-EDXRF) and by scanning electron microscopy (SEM).
  
  
  RESULTS
  Mineral loss was greater in G2 samples than in RMGI > CR > GIC > D (control). SEM images showed pronounced dentin demineralization in groups 2 and 4. The acid erosion has a significant effect on mineral loss (Ca and P) of root dentin without restoration.
  
  
  CONCLUSIONS
  Composite resin had the best chemical resistance to erosion among all the materials. Fluoride contained in GIC seemed to cause some protection, however, with material degradation. Chemical interaction of tooth-colored dental materials with root dentin could be assessed by μ-EDXRF.
authors: Universidade do Vale do Paraíba, UNIVAP, Research and Development Institute, IP&D Laboratory of Biomedical Vibrational Spectroscopy, LEVB, São José dos Campos, São Paulo, Brazil. lesoares@univap.br
authors: Luís Eduardo Silva
authors: LE
authors: Soares
authors: Luciana Reinaldo
authors: LR
authors: Lima
authors: Laís De Souza
authors: Lde S
authors: Vieira
authors: Ana Maria
authors: AM
authors: Do Espírito Santo
authors: Airton Abrahão
authors: AA
authors: Martin
mesh_terms: D000818:Animals; D002417:Cattle; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry*; D007180:Incisor / Q000033:anatomy & histology* / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000032:analysis; D013052:Spectrometry, X-Ray Emission; D014077:Tooth Erosion
chemical_list: D003764:Dental Materials; D008903:Minerals