title: Microhardness of dentine underlying ART restorations in primary molars: an in vivo pilot study.
abstract: OBJECTIVE
  To evaluate the microhardness of dentine underlying glass ionomer restorations made with Atraumatic Restorative Treatment.
  
  
  METHODS
  An experimental single-centre study.
  
  
  METHODS
  University Department, Brazil, 2001.
  
  
  METHODS
  Sixteen children were selected showing primary molars containing carious cavities (n = 29), which were restored using Fugi IX. Subsequently, some teeth were extracted respecting Nolla stage 7 or 8 of the permanent successor, and categorised according to the post-restoration time in the mouth: G1 (baseline, immediate extraction), G2 (30 days), G3 (90 days) and G4 (180 days). Four teeth were excluded because they were not in time of normal exfoliation. The 25 extracted teeth were resin embedded, sectioned mesiodistally and prepared metallographically. Knoop microhardness analysis (Micromet 2003; 10g for 1.5 sec.) produced identations in three areas of dentine: Zone 1 (just below the restoration), Zone 3 (as close as possible to the pulp) and Zone 2 (intermediate region between 1 and 3). Non-parametric statistical tests were done--at a significance level of 5%.
  
  
  RESULTS
  Four teeth were excluded. No significant difference was noted among the zones, inside the groups. Zones 1 and 2 showed a considerable increase of microhardness according to the time, except for Group 3 (p > 0.05).
  
  
  CONCLUSIONS
  Although microhardness had increased, it was not sufficiently equal to the microhardness of the healthy dentine, regardless of the depth evaluated.
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. biasantiago@openlink.com.br
authors.forename: B M
authors.initials: BM
authors.lastname: Santiago
authors.forename: D A
authors.initials: DA
authors.lastname: Ventin
authors.forename: L G
authors.initials: LG
authors.lastname: Primo
authors.forename: R
authors.initials: R
authors.lastname: Barcelos
mesh_terms: D002648:Child; D003731:Dental Caries / Q000473:pathology / Q000628:therapy; D003737:Dental Cavity Preparation / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin / Q000187:drug effects*; D005899:Glass Ionomer Cements / Q000494:pharmacology*; D006244:Hardness / Q000187:drug effects; D006801:Humans; D008963:Molar / Q000187:drug effects; D010865:Pilot Projects; D018709:Statistics, Nonparametric; D014080:Tooth Exfoliation; D014081:Tooth Extraction; D014094:Tooth, Deciduous / Q000187:drug effects
chemical_list: D005899:Glass Ionomer Cements; C110713:fuji IX