title: Cure behaviour of visible light-activated pattern materials.
abstract: OBJECTIVE
  This study tested the hypothesis that the cure behaviour (depth of cure and polymerization contraction) of light-activated pattern materials was no worse than that of light-activated composite resins, allowing them to be handled in a similar fashion.
  
  
  METHODS
  Depth of cure was measured by a penetrometer method.
  
  
  RESULTS
  Cure depths were comparable to those of composite resins, ranging from 3.52 mm (Lumin-X paste) to 6.76 mm (Visioform) after visible light activation for 30 s. There were significant differences in the depth of cure of the three materials tested (P < 0.001). Polymerization contraction was assessed by a minimal load transducer method. Values ranged from 0.45% (Lumin-X paste) to 1.89% (Visioform), lower than that of composite resins. There were significant differences in the polymerization contraction values for each of the three materials (P < 0.001).
  
  
  CONCLUSIONS
  It was concluded that light-activated pattern materials cure in a manner comparable to composite resins, and may be built up incrementally in a similar fashion.
authors.affiliation: University of Newcastle-upon-Tyne Dental School, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Whitworth
authors.forename: S H
authors.initials: SH
authors.lastname: Makhani
authors.forename: J F
authors.initials: JF
authors.lastname: McCabe
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D011108:Polymers; D011140:Polyurethanes; C029824:urethane dimethacrylate luting resin