title: Influence of removing excess of resin-based materials applied to eroded enamel on the resistance to erosive challenge.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of removing excess of resin-based materials applied to eroded enamel, subjected to erosive challenge.
  
  
  METHODS
  Bovine enamel blocks were immersed in HCl 0.01M, pH 2.3, for 30s under agitation at 50 rpm in room temperature, in order to form a softened erosion lesion. The blocks were then randomly divided into eight groups (n=12) and treated as follows: Cn- and Ce-control without treatment, Hn- and He-fissure resin sealant (Helioseal Clear(®)), An- and Ae-self-etch adhesive (Adhese(®)), In- and Ie-infiltrant (Icon(®)); being n-with excess removal and e-without excess removal of the material. After application of the materials, the blocks were immersed in HCl for 2 min, followed by immersion in artificial saliva for 120 min. This cycle was repeated four times a day for five days. Material thickness and enamel wear were assessed using profilometry. Data were analyzed by two-way ANOVA and Tukey's test (P<0.05).
  
  
  RESULTS
  Groups He, Ae, and Ie resulted in the formation of a layer of material over enamel, being similar effective in inhibiting erosion progression (P>0.05). Groups Hn, An, and In (with excess removal) were similar to controls (Cn, Ce) and resulted in near enamel loss after application and after erosive challenge (P>0.05).
  
  
  CONCLUSIONS
  Resin-based materials are able to protect enamel against erosion only when they are present over enamel, as a physical barrier.
  
  
  CONCLUSIONS
  The resin-based materials demonstrated potential to prevent the progression of erosion lesions when the material remains on the dental surface.
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil. Electronic address: psgenovez@yahoo.com.br.
authors.forename: Guida Paola Genovez
authors.initials: GP
authors.lastname: Tereza
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil.
authors.forename: Gabriela Cristina
authors.initials: GC
authors.lastname: de Oliveira
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil.
authors.forename: Maria Aparecida
authors.initials: MA
authors.lastname: de Andrade Moreira Machado
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil.
authors.forename: Thais Marchine
authors.initials: TM
authors.lastname: de Oliveira
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil.
authors.forename: Thiago Cruvinel
authors.initials: TC
authors.lastname: da Silva
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru School of Dentistry, University of São Paulo Bauru, Brazil. Electronic address: danirios@usp.br.
authors.forename: Daniela
authors.initials: D
authors.lastname: Rios
mesh_terms: D000134:Acid Etching, Dental; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000494:pharmacology; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects* / Q000473:pathology; D003764:Dental Materials / Q000737:chemistry; D006851:Hydrochloric Acid / Q000737:chemistry; D010895:Pit and Fissure Sealants / Q000494:pharmacology; D019279:Resin Cements / Q000494:pharmacology*; D012117:Resins, Synthetic / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D014077:Tooth Erosion / Q000139:chemically induced* / Q000473:pathology / Q000517:prevention & control
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D012117:Resins, Synthetic; D012464:Saliva, Artificial; C578177:icon infiltrant; C059908:Helioseal; D006851:Hydrochloric Acid
keywords: Adhesive; Dental enamel; Dental erosion; Infiltrant; Pit and fissure resin sealants