title: Volumetric shrinkage of composites using video-imaging.
abstract: OBJECTIVE
  This study involves investigation of the use of video-imaging for measurement of volumetric shrinkage of composites.
  
  
  METHODS
  Six composites were tested for volumetric shrinkage using video-imaging. The volumetric shrinkage was measured using the single- and multi-view volumetric reconstruction modes. All composites were cured using a VIP(TM) curing light for 40s at 500 mW/cm(2). Dynamic shrinkage was measured using the single-view mode with a red filter placed over the detector opening.
  
  
  RESULTS
  Analysis of the volumetric shrinkage values by a one way ANOVA for each composite showed no difference for the single- and multi-view measurement mode. The shrinkage values determined by video-imaging were compared to those measured for the same composites by mercury dilatometry by one way ANOVA followed by a paired comparison using the Bonferroni method.
  
  
  CONCLUSIONS
  The video-imaging technique gives reproducible results for volumetric shrinkage of composites comparable to those measured by dilatometry.
authors.affiliation: Research and Development, Bisco Inc., Schaumburg, IL 60193, USA. louis.sharp@bisco.com
authors.forename: Louis J
authors.initials: LJ
authors.lastname: Sharp
authors.forename: Inchon B
authors.initials: IB
authors.lastname: Choi
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Lee
authors.forename: Abegail
authors.initials: A
authors.lastname: Sy
authors.forename: Byoung I
authors.initials: BI
authors.lastname: Suh
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry / Q000528:radiation effects; D017609:Barium Compounds / Q000737:chemistry / Q000528:radiation effects; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry / Q000528:radiation effects; D002138:Calibration; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D055117:Curing Lights, Dental; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry / Q000528:radiation effects; D008768:Methylmethacrylates / Q000737:chemistry / Q000528:radiation effects; D011140:Polyurethanes / Q000737:chemistry / Q000528:radiation effects; D019279:Resin Cements / Q000737:chemistry / Q000528:radiation effects; D012822:Silicon Dioxide / Q000737:chemistry / Q000528:radiation effects; D013499:Surface Properties; D013997:Time Factors; D014741:Video Recording; D015040:Zirconium / Q000737:chemistry / Q000528:radiation effects
chemical_list: D000180:Acrylic Resins; C121035:Aeliteflo; D017609:Barium Compounds; D003188:Composite Resins; D003764:Dental Materials; C513708:Heliomolar; D008689:Methacrylates; D008768:Methylmethacrylates; D011140:Polyurethanes; D019279:Resin Cements; C083568:Z100 composite resin; C065770:Herculite XR; C029824:urethane dimethacrylate luting resin; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium