title: Clinical performance and SEM evaluation of direct composite restorations in primary molars.
abstract: OBJECTIVE
  To evaluate the clinical outcome of composite restorations performed in primary molars after 18 months and the morphology of the dentin/resin interface.
  
  
  METHODS
  41 primary molars from children aged 4-9 years were restored with Scotchbond Multi-Purpose Plus adhesive system and Z100 resin-based composite. The restorations were evaluated at baseline, 6, 12 and 18 months using the USPHS method for direct clinical analysis. Plaster models were made at each evaluation period for indirect evaluation. For the morphologic analysis of the dentin/resin interface, seven exfoliated teeth were sectioned longitudinally in a mesio/distal direction and observed in the electro scanning electron microscope.
  
  
  RESULTS
  100% (n = 40) of the restorations evaluated at 6 months were scored as Alpha for anatomical form, color matching, secondary caries, color alteration, and marginal degradation. At 12 months, 96.4% (n = 28) of the restorations received Alpha score and 3.4% Charlie score. At 18 months, all restorations evaluated (27/27) received Alpha score. 23 restorations were indirectly evaluated at 6, 12 and 18 months postoperatively. No significant wear or fractures were observed in any of the restorations. In the evaluation of the dentin/resin interface, the formation of a consistent hybrid layer was observed and the restorations were well adapted to the dentin at 18 months postoperatively.
authors.affiliation: Department of Pediatric Dentistry, Undergraduate Program, State University of Campinas, Piracicaba Dental School, São Paulo, Brazil. rmpuppin@fop.unicamp.br
authors.forename: Regina Maria
authors.initials: RM
authors.lastname: Puppin-Rontani
authors.forename: Mario Fernando
authors.initials: MF
authors.lastname: de Góes
authors.forename: Cleane Elizabete
authors.initials: CE
authors.lastname: Voelske
authors.forename: Franklin
authors.initials: F
authors.lastname: García-Godoy
mesh_terms: D000134:Acid Etching, Dental; D002648:Child; D002675:Child, Preschool; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries / Q000628:therapy; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin / Q000648:ultrastructure; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D005500:Follow-Up Studies; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008963:Molar; D019279:Resin Cements; D012822:Silicon Dioxide; D014094:Tooth, Deciduous; D015040:Zirconium
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium