title: Retention between a serrated steel dowel and different core materials.
abstract: This in vitro study compared the retention of dowel posts using different core materials. Glass ionomer cements, composite resin, and amalgam core materials were combined with serrated dowel posts to form post and core assemblies. Individual post-core assemblies were mounted with a special jig in an Instron Universal testing machine. A tensile force was applied at a cross-head speed of 0.02 cm/min and the separation force was recorded. Glass ionomer cement core materials were weak in tension and metalized ionomers remained brittle and were not fracture resistant. Composite resin and amalgam were strong in tension and relatively fracture resistant.
authors.affiliation: Department of Biomaterials, Boston University, Goldman School of Graduate Dentistry, Mass.
authors.forename: P L
authors.initials: PL
authors.lastname: Millstein
authors.forename: J
authors.initials: J
authors.lastname: Ho
authors.forename: D
authors.initials: D
authors.lastname: Nathanson
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D003723:Dental Amalgam / Q000737:chemistry*; D001840:Dental Bonding; D003779:Denture Design; D003781:Denture Retention; D005899:Glass Ionomer Cements / Q000737:chemistry*; D011176:Post and Core Technique; D013193:Stainless Steel / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D013193:Stainless Steel; D003723:Dental Amalgam