title: Marginal fracture of posterior composite resins.
abstract: This study assesses the early cavomarginal breakdown of the newer posterior composite resin restorations compared with that of amalgam restorations. A total of 432 posterior composite restorations and 73 amalgam restorations were examined: 121 composite restorations (28%) and 44 amalgam restorations (60%) clinically showed a marginal crevice at some point on the cavosurface margin of the restoration at 6-month, 1-year, and 2-year recalls. The largest single reason for poor marginal adaptation was marginal fracture. Up to 2 years, the marginal integrity of the studied posterior composites was superior to that of an amalgam alloy. It was determined that smaller cavities, greater bulk of resin at the margin (especially at functional cusp areas), and well-finished margins without overfiling seem to reduce the occurrence of marginal fracture on composite resin restorations.
authors.affiliation: Indiana University School of Dentistry, Indianapolis 46202.
authors.forename: M
authors.initials: M
authors.lastname: Fukushima
authors.forename: J C
authors.initials: JC
authors.lastname: Setcos
authors.forename: R W
authors.initials: RW
authors.lastname: Phillips
mesh_terms: D003188:Composite Resins; D003300:Copper; D003723:Dental Amalgam; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D003793:Dental Restoration, Permanent / Q000009:adverse effects; D006801:Humans; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014070:Tooth
chemical_list: D003188:Composite Resins; D003300:Copper; D003723:Dental Amalgam