title: Etching effect of 17% EDTA and a non-rinse conditioner (NRC) on primary enamel and dentin.
abstract: OBJECTIVE
  To investigate the effect of a new non-rinse conditioner (NRC) and 17% EDTA as etchants on the micromorphology of primary tooth enamel and dentin, in comparison with 36% phosphoric acid (PA) when applied for 15 s and 7 s.
  
  
  METHODS
  Enamel specimens obtained from 40 extracted primary second molars were used to create four groups (n=10) which received the following treatments on unground enamel surface: Group 1: 36% PA/15 s, Group 2: 36% PA/7 s, Group 3: NRC 20 s, Group 4: 17% EDTA/60 s. The same treatments were applied on flattened primary tooth dentin specimens (four groups/n=10). All treated surfaces were examined by SEM.
  
  
  RESULTS
  For enamel specimens, a Type II etching pattern was evident in Groups 1 and 3. In Group 2, an uneven Type II pattern was present with prism peripheries partially intact. A mixture of Type II and Type III etching patterns were observed in Group 4. Although all conditioners removed dentin smear to varying degrees, the overall performance of 17% EDTA was weaker than PA and NRC.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. zaferc@hotmail.com
authors.forename: Z C
authors.initials: ZC
authors.lastname: Cehreli
authors.forename: N
authors.initials: N
authors.lastname: Altay
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D002614:Chelating Agents / Q000494:pharmacology*; D002648:Child; D003743:Dental Enamel / Q000187:drug effects* / Q000648:ultrastructure; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D004492:Edetic Acid / Q000494:pharmacology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008298:Maleates / Q000494:pharmacology*; D008855:Microscopy, Electron, Scanning; D008963:Molar; D010756:Phosphoric Acids / Q000494:pharmacology; D016369:Smear Layer; D014094:Tooth, Deciduous / Q000187:drug effects* / Q000648:ultrastructure
chemical_list: D002614:Chelating Agents; D008298:Maleates; D010756:Phosphoric Acids; C444699:non-rinse conditioner; D004492:Edetic Acid