title: Dimensional changes in gypsum fragments bonded with cyanoacrylate.
abstract: OBJECTIVE
  Accidental fractures may occur during manipulation and transportation of plaster casts. In clinical practice, plaster fragments may be bonded without harming the accuracy of the final denture, provided that the bonding agent does not cause dimensional alterations. Cyanoacrylate could be a good material because of its ease of use, quick set, wide availability, and low cost. The aim of this study was to assess the dimensional alteration of Type IV plaster fragments bonded with a cyanoacrylate-based adhesive.
  
  
  METHODS
  Ten hexagonal regular prisms were made of Type IV plaster, with two reference marks on one of the faces. The distance between the marks was measured under a comparison microscope. After this, the prisms were fractured so that the fracture line would be between the two reference marks, bonded with a cyanoacrylate-based universal adhesive and measured again.
  
  
  RESULTS
  The mean difference between the measurements performed before and after fracture and bonding of the fragments was 0.0194 mm. At a level of significance of 0.05, there was no statistically significant difference between the measurements before and after fracture and bonding of the dies (p = 0.1582).
  
  
  CONCLUSIONS
  It may be concluded that bonding of Type IV plaster fragments with a cyanoacrylate-based adhesive did not cause significant dimensional alterations.
authors.affiliation: Department of Prosthodontics, UERJ, Rio de Janeiro, Brazil. mayra.cardoso@bol.com.br
authors.forename: Mayra
authors.initials: M
authors.lastname: Cardoso
authors.forename: Marcelo Ferreira
authors.initials: MF
authors.lastname: Torres
authors.forename: Eduardo José Veras
authors.initials: EJ
authors.lastname: Lourenço
authors.forename: Daniel de Moraes
authors.initials: Dde M
authors.lastname: Telles
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D002133:Calcium Sulfate / Q000737:chemistry*; D003487:Cyanoacrylates / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008853:Microscopy; D003765:Models, Dental; D013499:Surface Properties
chemical_list: D000269:Adhesives; D003487:Cyanoacrylates; D003764:Dental Materials; C538957:Super Bonder Instant Adhesive; D002133:Calcium Sulfate