Australian Dental Journal · 1990 · 71 citations · 10 references
DentistryDental Materials ScienceRestorative DentistryDental MaterialsMechanical Behavior Of MaterialsMechanical Properties Of Dental MaterialsComposite MaterialsComposite Resin RestorationsComposite ResinsElastic PropertiesFracture MechanicsFracture ToughnessClass Iv CavitiesComposite Resin Fracture ToughnessElastic ModulusElastic Modulus MeasurementFlaw Size Effects On Fracture ToughnessFracture Resistance Of RestorationsIncisal WearTensile Strength
One hundred and two Class IV cavities were restored randomly with four composite resins. The restorations were assessed at six months, one year, two years and three years for surface chipping, bulk fracture and incisal wear. The data were correlated with various mechanical properties of the materials. A significant correlation was found between surface chipping/bulk fracture and fracture toughness (P = 0.002), elastic modulus (P = 0.006) and tensile strength (P = 0.045). There was a trend towards an association between incisal wear and both elastic modulus and inherent flaw size. Fracture toughness may be a useful indicator of the clinical performance of composites in Class IV cavities.
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