title: Quantification of all-ceramic crown margin surface profile from try-in to 1-week post-cementation.
abstract: OBJECTIVE
  To use profilometry to assess the margin surface profile of all-ceramic crowns (ACC's) at try-in and 1-week after cementation with dual-cured resin (DC, RelyX ARC, 3M ESPE, St. Paul, MN, USA), self-adhesive dual-cured resin (SADC, RelyX Unicem, 3M ESPE), light-cured resin (LC, RelyX Veneer, 3M ESPE) or chemically cured resin-modified glass ionomer (RMGI, RelyX Luting Plus, 3M ESPE) luting cement.
  
  
  METHODS
  Forty, sound, extracted, human, premolar teeth underwent a standardised preparation for ACC's. IPS Empress (Ivoclar-Vivadent, Liechtenstein) crowns of standard dimensions were fabricated and 10 luted with each cement and stored in water for 7 days. Three groups of serial profiles were taken, the first of the tooth preparation, the second of the crown margins at try-in and lastly of the crown margins after cementation and 7 days water storage.
  
  
  RESULTS
  There were no significant differences in the crown margin surface profile between the four cement groups at try-in. The change in crown margin position between try-in and post-cementation was significantly greater for DC than for LC and RMGI. SADC was not significantly different to the other cements. There were no significant differences in the crown margin extensions between the four cement groups, however most of the IPS Empress ACC's in this study were underextended but this was not statistically significant.
  
  
  CONCLUSIONS
  IPS Empress ACC's seated more fully with LC and RMGI than with DC cement.
authors.affiliation: Health and Healthcare Research Group, School of Medicine and Dentistry, Queen's University Belfast, Grosvenor Rd., Belfast BT12 6BP, UK.
authors.forename: Melissa-L
authors.initials: ML
authors.lastname: Good
authors.forename: Christina A
authors.initials: CA
authors.lastname: Mitchell
authors.forename: Maria R
authors.initials: MR
authors.lastname: Pintado
authors.forename: William H
authors.initials: WH
authors.lastname: Douglas
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic; D014867:Water / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; C075815:IPS-Empress ceramic; D011109:Polymethacrylic Acids; C483701:Rely X Unicem; C528569:Rely-X; C462240:RelyX ARC; D019279:Resin Cements; C084550:Vitremer; D014867:Water; D003776:Dental Porcelain; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate