title: Influence of the flexural modulus of prefabricated and experimental posts on the fracture strength and failure mode of composite resin cores.
abstract: The purpose of this study was to evaluate the influence of flexural modulus of non-metal posts on the fracture strength and failure mode of composite resin cores. Thirty-two human premolars were divided into four groups: prefabricated glass fiber post with 1.0 mm diameter and composite resin core (Group PE1.0), that with 1.5 mm diameter and composite resin core (Group PE1.5), experimental post (flexural modulus; 4.25GPa) and composite resin core (Group EX), and preparation for abutment teeth only (Group NT). After a static loading test, the fracture strength and failure mode were recorded. Group NT (1670.81 N) showed higher fracture strength than Groups PE1.0 (866.44 N), PE1.5 (825.19 N) and EX (1075.63 N) (p<0.05). This study showed that the fracture strength of endodontically treated teeth restored with composite resin cores is not influenced by the flexural modulus of non-metal posts.
authors.affiliation: Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
authors.forename: Naosuke
authors.initials: N
authors.lastname: Kumagae
authors.forename: Wataru
authors.initials: W
authors.lastname: Komada
authors.forename: Yuji
authors.initials: Y
authors.lastname: Fukui
authors.forename: Daizo
authors.initials: D
authors.lastname: Okada
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Keiichi
authors.initials: K
authors.lastname: Yoshida
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miura
mesh_terms: D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry*; D000044:Dental Abutments; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D055119:Elastic Modulus; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D018583:Pliability; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D019231:Tooth Preparation, Prosthodontic; D019553:Tooth, Nonvital / Q000628:therapy
chemical_list: C469237:Clearfil Core; D003188:Composite Resins; D003764:Dental Materials; C113550:FiberKor, sculpture; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019279:Resin Cements; C009753:fiberglass; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols