title: The behaviour of post-retained core materials supported by coronal tooth structure in vitro.
abstract: This study was designed to investigate the effect of retaining coronal tooth substance on the performance of post-retained core materials, and to compare the fracture resistance of the system with an intact tooth prepared to similar dimensions. Ten teeth restored with post-retained silver amalgam, and 10 teeth restored with silver-glass cermet, all with a retained single wall of coronal tooth substance, were compared with 10 unrestored teeth prepared to similar dimensions when subjected to a shearing load. The results showed no statistically significant difference between the unrestored teeth and those restored with a silver-glass cermet. Whilst the teeth restored with silver amalgam had a significantly higher fracture resistance (P > 0.01) there was greater tendency to root fracture.
authors.affiliation: Division of Restorative Dentistry, School of Clinical Dentistry, Queen's University of Belfast, UK.
authors.forename: M D
authors.initials: MD
authors.lastname: Russell
authors.forename: M
authors.initials: M
authors.lastname: Masood
authors.forename: L
authors.initials: L
authors.lastname: Cunningham
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D016722:Cermet Cements / Q000737:chemistry*; D003442:Crowns / Q000706:statistics & numerical data; D003723:Dental Amalgam / Q000737:chemistry*; D019544:Equipment Failure Analysis / Q000379:methods / Q000706:statistics & numerical data; D006801:Humans; D066298:In Vitro Techniques; D008334:Mandible; D011176:Post and Core Technique / Q000706:statistics & numerical data; D019228:Tooth Crown / Q000502:physiology*
chemical_list: D016722:Cermet Cements; D003723:Dental Amalgam