title: Effect of retention grooves on fracture strength of Class 2 composite resin and amalgam restorations.
abstract: The effect of approximal retention grooves on fracture strengths of class 2 composite resin and amalgam restorations was tested in vitro. Results indicated that retention grooves significantly improved (P less than 0.05) the compressive strength of amalgam restorations (38.6% stronger). For posterior composite resin restorations, there was no significant difference in mean compressive strength of restorations in preparations with and without retention grooves.
authors.forename: D J
authors.initials: DJ
authors.lastname: Caplan
authors.forename: G E
authors.initials: GE
authors.lastname: Denehy
authors.forename: J W
authors.initials: JW
authors.lastname: Reinhardt
mesh_terms: D003188:Composite Resins; D003723:Dental Amalgam; D003737:Dental Cavity Preparation / Q000379:methods*; D006801:Humans
chemical_list: D003188:Composite Resins; D003723:Dental Amalgam