title: Correlation between fracture properties and clinical performance of composite resins in Class IV cavities.
abstract: 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.
authors.affiliation: Australian Dental Standards Laboratory, School of Dental Science, University of Melbourne.
authors.forename: M J
authors.initials: MJ
authors.lastname: Tyas
mesh_terms: D003116:Color; D003188:Composite Resins; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D005500:Follow-Up Studies; D006801:Humans; D008422:Materials Testing; D012044:Regression Analysis; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C050634:estic; C039734:Durafill; C035190:miradapt; C059919:Estilux posterior