title: In situ effect of an erosive challenge on different restorative materials and on enamel adjacent to these materials.
abstract: OBJECTIVE
  This in situ study evaluated the effect of an erosive challenge on different restorative materials and on enamel restored with these materials, as well as the ability of these materials to protect the adjacent enamel against erosion.
  
  
  METHODS
  Ten volunteers wore palatal devices with eight bovine enamel blocks, randomly selected and distributed into two vertical rows, corresponding to the following groups: GI/GV, resin-modified glass ionomer; GII/GVI, conventional glass ionomer; GIII/GVII, composite resin; GIV/GVIII, amalgam. One row (corresponding to groups I-IV) was immersed in a cola drink and the other row (corresponding to groups V-VIII) was subjected to saliva only. The palatal device was continuously worn for 7 days and only half of the appliance (groups I-IV) was immersed in the soft drink (Coca-Cola), 150 mL) for 5 min, three times a day. The study variables comprised the wear (profilometry, microm) and the percentage of surface microhardness change (%SMHC). Data were tested for significant differences by two-way ANOVA and Tukey's tests (p<0.05).
  
  
  RESULTS
  Considering the restorative materials, for %SMHC and wear, there were no differences among the materials and between the saliva and the erosive challenge. For enamel analyses, the erosive challenge promoted a higher wear and %SMHC of the enamel than did the saliva. There were no significant differences in wear and %SMHC of the enamel adjacent to the different restorative materials.
  
  
  CONCLUSIONS
  This research data suggest that there is little %SMHC and wear of the studied restorative materials and none of them had a preventive effect against erosion on adjacent enamel, which showed a pronounced wear.
authors.affiliation: Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Alameda Dr. Octávio Pinheiro Brisolla 9-75, PO Box 73, 17012-101 Bauru, SP, Brazil. daniriosop@yahoo.com.br <daniriosop@yahoo.com.br>
authors.forename: Daniela
authors.initials: D
authors.lastname: Rios
authors.forename: Heitor Marques
authors.initials: HM
authors.lastname: Honório
authors.forename: Luciana Fávaro
authors.initials: LF
authors.lastname: Francisconi
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Magalhães
authors.forename: Maria Aparecida
authors.initials: MA
authors.lastname: de Andrade Moreira Machado
authors.forename: Marília Afonso Rabelo
authors.initials: MA
authors.lastname: Buzalaf
mesh_terms: D000328:Adult; D000818:Animals; D002253:Carbonated Beverages; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003743:Dental Enamel / Q000473:pathology*; D003764:Dental Materials / Q000737:chemistry*; D019554:Dental Restoration Wear / Q000145:classification*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006244:Hardness; D006801:Humans; D019279:Resin Cements / Q000737:chemistry; D012463:Saliva / Q000502:physiology; D013499:Surface Properties; D014077:Tooth Erosion / Q000139:chemically induced* / Q000503:physiopathology
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; C444701:Filtek Z250; D005899:Glass Ionomer Cements; D019279:Resin Cements; C084550:Vitremer; C110712:ketac-molar; C033470:Dispersalloy; D003723:Dental Amalgam