title: Marginal fidelity of crowns fabricated from six proprietary provisional materials.
abstract: BACKGROUND
  The most important requirement for an interim crown is suitable marginal adaptation.
  
  
  OBJECTIVE
  This in vitro study compared vertical discrepancies of margins for complete crowns made with six provisional materials (Provipont, Protemp Garant, Unifast LC, Triad VLC, Splintline, and Jet).
  
  
  METHODS
  A direct technique was used to fabricate 60 provisional complete crowns on prepared molars with a polyvinyl siloxane impression and a vacuum-formed polypropylene sheet as matrices. A measuring microscope was used to measure vertical marginal discrepancies at x 100. Data were analyzed with Kruskal-Wallis one-way analysis of variance and Mann-Whitney U tests (alpha = 0.05).
  
  
  RESULTS
  Significant differences were found between resinous materials tested (p = 0.0002) and multiple comparisons tests indicated no significant difference between Splintline and Protemp Garant; Provipont, Unifast LC, and Triad VLC; and Unifast LC, Triad and Jet provisional materials.
  
  
  CONCLUSIONS
  This study indicated that provisional crowns fabricated with Splintline and Protemp Garant interim restorative materials recorded the least marginal discrepancies.
authors.affiliation: Department of Restorative Dentistry, Loma Linda University, Calif, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Tjan
authors.forename: J
authors.initials: J
authors.lastname: Castelnuovo
authors.forename: G
authors.initials: G
authors.lastname: Shiotsu
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003760:Dental Impression Materials; D003761:Dental Impression Technique; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design; D003794:Dental Restoration, Temporary; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D011126:Polypropylenes; D011140:Polyurethanes / Q000737:chemistry; D011145:Polyvinyls; D012117:Resins, Synthetic / Q000737:chemistry; D012833:Siloxanes; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003760:Dental Impression Materials; D008689:Methacrylates; D008768:Methylmethacrylates; D011126:Polypropylenes; D011140:Polyurethanes; D011145:Polyvinyls; D012117:Resins, Synthetic; D012833:Siloxanes; C034183:vinyl polysiloxane; C060386:Triad resin; C069716:Jet, dental resin; C029824:urethane dimethacrylate luting resin; D017438:Bisphenol A-Glycidyl Methacrylate; C009931:poly(ethylmethacrylate); C069714:Protemp; C078282:G-C Unifast LC