title: In vitro dentine permeability: the relative effect of a dentine bonding agent on crown preparations.
abstract: OBJECTIVE
  The aim of this study was to determine whether a dentine bonding agent (DBA) had an effect in reducing fluid filtration under cemented provisional crowns.
  
  
  METHODS
  Crown preparations on 34 premolars, randomly allocated to two equal-sized test and control groups, were assessed for dentine permeability by a fluid filtration technique. In the test group, prepared crowns were acid-etched and then treated with a DBA (Prime & Bond NT). In the control group, no such DBA was applied. Provisional crowns were cemented on both groups of teeth using non-eugenol zinc oxide cement. Fluid filtration rates were measured repeatedly after crown preparation, at cementation, 1 h, 1 day, 1 week and 3 weeks following crown cementation for both groups. Filtration rates were also measured after acid-etching and dentine bonding for the test group.
  
  
  RESULTS
  There was insufficient evidence to suggest any statistically significant differences either between the two groups or, on average, across the five time points in each group in terms of the relative percentage of fluid filtration.
  
  
  CONCLUSIONS
  The DBA used did not seal dentinal tubules any more than did the smear layer and provisional crowns luted with a non-eugenol ZnO cement.
authors.affiliation: Glasgow Dental Hospital and School, 378 Sauchiehall Street, Level 9, PG Balcony, Glasgow G2 3JZ, Scotland, UK. 0104110e@student.gla.ac.uk
authors.forename: T O
authors.initials: TO
authors.lastname: Elgalaid
authors.forename: C C
authors.initials: CC
authors.lastname: Youngson
authors.forename: S
authors.initials: S
authors.lastname: McHugh
authors.forename: A F
authors.initials: AF
authors.lastname: Hall
authors.forename: S L
authors.initials: SL
authors.lastname: Creanor
authors.forename: R H
authors.initials: RH
authors.lastname: Foye
mesh_terms: D000134:Acid Etching, Dental; D002484:Cementation / Q000379:methods; D016001:Confidence Intervals; D003442:Crowns; D003738:Dental Cements / Q000627:therapeutic use; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D003806:Dentin Permeability / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D019234:Dentinal Fluid / Q000187:drug effects; D005374:Filtration / Q000379:methods; D005500:Follow-Up Studies; D006801:Humans; D011109:Polymethacrylic Acids / Q000494:pharmacology; D016369:Smear Layer; D019246:Tooth Preparation; D015034:Zinc Oxide / Q000627:therapeutic use
chemical_list: D003738:Dental Cements; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C449162:zinc oxide-non-eugenol cement; D015034:Zinc Oxide