title: Resin elasticity and the strengthening of all-ceramic restorations.
abstract: Resin luting of all-ceramic restorations results in increased performance; however, the strengthening mechanism and the role of the mechanical properties of the resin are not fully understood. The hypothesis tested is that ceramic strength enhancement is dependent on the elastic modulus of the resin. Three-point flexural moduli of a flowable, luting, and hybrid composite resin were characterized. Two hundred forty porcelain discs were air-abraded. One group acted as a control, and 3 additional groups were coated with 120 +/- 20 microm of each resin prior to bi-axial flexure testing. All resins significantly increased in mean strength, and the associated strength increase was related to the elastic modulus of the resin (R(2) = 0.9885), so the hypothesis was accepted. The combination of Poisson constraint and the creation of a resin-inter-penetrating layer sensitive to the elastic modulus of the resin may provide an explanation of the strengthening mechanism.
authors.affiliation: Biomaterials Unit, School of Dentistry, University of Birmingham, St. Chad's Queensway, Birmingham B4 6NN, UK. addisono@bham.ac.uk
authors.forename: O
authors.initials: O
authors.lastname: Addison
authors.forename: P M
authors.initials: PM
authors.lastname: Marquis
authors.forename: G J P
authors.initials: GJ
authors.lastname: Fleming
mesh_terms: D020906:Air Abrasion, Dental; D003188:Composite Resins / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004548:Elasticity; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D018583:Pliability; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D014783:Viscosity
chemical_list: C112828:Clearfil AP-X; D003188:Composite Resins; D005899:Glass Ionomer Cements; D008689:Methacrylates; D019279:Resin Cements; C084550:Vitremer; C111840:flowable hybrid composite; C483027:vitadur alpha; D003776:Dental Porcelain