title: Strength of base materials.
abstract: OBJECTIVE
  To compare the punch resistance of VariGlass and Vitrebond.
  
  
  METHODS
  Discs measuring 1.4 cm in diameter and 1.5 mm thick of VariGlass (VG) and Vitrebond (VT) light-activated lining materials, were prepared and submitted to punch testing in a universal testing machine at 7 minutes, 30 minutes and 24 hours after mixing.
  
  
  RESULTS
  VG showed higher resistance to punch testing than the VT in the three periods evaluated (P< 0.01). The results were further compared to previous data obtained from three calcium hydroxide lining cements which gave much lower values than VG and VT (P< 0.01).
authors.affiliation: Faculdade de Odontologia de Bauru, Brazil.
authors.forename: R M
authors.initials: RM
authors.lastname: Carvalho
authors.forename: R B
authors.initials: RB
authors.lastname: Del'Hoyo
authors.forename: R S
authors.initials: RS
authors.lastname: Suga
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D002126:Calcium Hydroxide / Q000737:chemistry; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis; D004548:Elasticity; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D008903:Minerals / Q000737:chemistry; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D008903:Minerals; C081982:VariGlass VLC; C067790:Vitrabond; C025702:Dycal; D003723:Dental Amalgam; C040408:Life (dental material); D002126:Calcium Hydroxide