title: Failure and fracture characteristics of glass poly(vinylphosphonate) cements.
abstract: OBJECTIVE
  A glass poly(vinylphosphonate) cement, Diamond Carve, consisting of an ion leachable glass and a co-polymer of poly(vinylphosphonic-co-acrylic acid) was characterised. Samples were mixed for mechanical analysis using a linear elastic fracture mechanics (LEFM) approach.
  
  
  METHODS
  Fracture toughness, flexural strength, Young's modulus, toughness and compressive strength were measured. Cement samples were tested at ageing times of 1, 7, 28, 84 and 168 days.
  
  
  RESULTS
  Fracture toughness values in the range 0.6-0.82 MPa square root m were obtained. Young's modulus increased with ageing time from 8.6 GPa at one day to 14.3 GPa at 168 days. An increase in compressive strength from 149 to 242 MPa was also observed over the same time period.
  
  
  CONCLUSIONS
  The influence of ageing time had a significant effect on the mechanical properties of the cement. The expected rise in the mechanical properties was observed as a result of the ongoing crosslinking in the polysalt matrix.
authors.affiliation: Department of Materials Science and Technology, University of Limerick, Plassey Technological Park, Castletroy, Ireland. barry.fennell@ul.ie/robert.hill@ul.ie
authors.forename: B
authors.initials: B
authors.lastname: Fennell
authors.forename: R G
authors.initials: RG
authors.lastname: Hill
authors.forename: A
authors.initials: A
authors.lastname: Akinmade
mesh_terms: D019245:Compressive Strength; D003738:Dental Cements / Q000737:chemistry*; D004548:Elasticity; D008422:Materials Testing; D010755:Organophosphates / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry; D018583:Pliability; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D003738:Dental Cements; D010755:Organophosphates; D009943:Organophosphorus Compounds; C119822:glass poly(vinylphosphate)cement