title: Comparative in vitro evaluation of two provisional restorative materials.
abstract: BACKGROUND
  Provisional crowns traditionally have been associated with problems such as poor occlusion, contour, fit, and finish. Fabrication procedures should be uncomplicated and predictable within a realistic time frame.
  
  
  OBJECTIVE
  The purpose of this study was to compare the quality of provisional restorations fabricated by dental students from 2 different materials (bis-acryl composite resin and PMMA) and identify the advantages and disadvantages associated with each material.
  
  
  METHODS
  This study evaluated the occlusion, contour, marginal adaptation, and finish of 222 provisional crowns fabricated by 2 groups (A and B) of dental students. One bis-acryl composite resin material (Integrity) and 2 PMMA resins (C&B Resin and Snap) were evaluated.
  
  
  RESULTS
  For group A, Integrity was statistically superior (P<.05) to C&B Resin in all 4 categories for anterior provisional crowns. For posterior provisional crowns, Integrity proved superior in the categories of contour and marginal adaptation, but no significant differences were established for occlusion and finish. For group B, Integrity was statistically superior to Snap in the categories of occlusion, contour, and marginal adaptation, whereas there was no statistical difference in finish. When all 4 categories were analyzed, Integrity was found to be statistically superior.
  
  
  CONCLUSIONS
  Bis-acryl composite resin (Integrity) was significantly superior to PMMA (C&B Resin and Snap) as a provisional restorative material.
authors.affiliation: Department of Operative Dentistry, College of Dentistry, University of Florida, Gainesville, FL 32610, USA. hyoung@dental.ufl.edu
authors.forename: H M
authors.initials: HM
authors.lastname: Young
authors.forename: C T
authors.initials: CT
authors.lastname: Smith
authors.forename: D
authors.initials: D
authors.lastname: Morton
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003442:Crowns; D003760:Dental Impression Materials / Q000737:chemistry; D003766:Dental Occlusion; D003775:Dental Polishing; D017267:Dental Prosthesis Design; D003833:Denture, Partial, Temporary; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013223:Statistics as Topic; D013335:Students, Dental; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003760:Dental Impression Materials; D011109:Polymethacrylic Acids; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; C091347:vinyl ethyl methacrylate; D019904:Polymethyl Methacrylate