title: Compressive shear strength of core materials and restoring techniques.
abstract: In this study, ninety extracted endodontically treated mandibular molars were mounted in acrylic resin blocks. Five groups of eighteen extracted teeth were prepared by two different techniques. A peripheral shelf 2 mm deep and 1.4 mm wide was prepared as a first technique, while TMS pins were used in the second group. The teeth were then restored with five different core materials: silver-reinforced glass-ionomer, resin-modified glass-ionomer, self-cured glass-ionomer, polyacid-modified composite resin, and titanium-reinforced composite resin. An Instron testing machine was used to apply shear force at a crosshead speed of 2 mm/min until fracture occurred. The results were obtained statistically using analysis of variance and least significant difference tests. According to the results of this study, Ti-core and composite resin were the strongest core materials when subjected to shear forces, and the most retentive preparation design was the vertical-pin design. The fractures of these materials with a vertical-pin design were mostly seen at the core and the tooth.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
authors.forename: S M
authors.initials: SM
authors.lastname: Sahmali
authors.forename: G
authors.initials: G
authors.lastname: Saygili
mesh_terms: D000704:Analysis of Variance; D016722:Cermet Cements; D003188:Composite Resins; D019245:Compressive Strength; D003772:Dental Pins; D017268:Dental Prosthesis Retention / Q000295:instrumentation / Q000379:methods; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011176:Post and Core Technique; D018030:Silver Compounds; D014025:Titanium; D019231:Tooth Preparation, Prosthodontic
chemical_list: D016722:Cermet Cements; C105428:Compoglass; D003188:Composite Resins; D005899:Glass Ionomer Cements; D018030:Silver Compounds; C084550:Vitremer; C119198:Vivaglass Fil; C067445:Chelon Silver; C079578:Ti-Core composite resin; D014025:Titanium