title: Investigation of distortions around the cervical area of teeth restored with two kinds of crown materials.
abstract: The purpose of this study was to identify crown materials to decrease the stress concentrated at the cervical area of endodontically treated teeth. To this end, 14 extracted human mandibular premolars were divided into two groups for this study: complete cast crowns versus polymer-based crown and bridge material crowns. Both complete cast crowns (MC) and polymer-based crown and bridge material crowns (HC) were cemented with a glycidyl methacrylate-based resin cement (RC) to composite resin cores with glass fiber posts. Static loading was applied and distortion was measured with four pieces of strain gages attached to the marginal area. Findings showed that there was a large difference in distortion between crown and root in MC. On the other hand, distortions at the cervical area of crown and root were similar in HC.
authors.affiliation: Fixed Prosthodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. c.suzuki.fpro@tmd.ac.jp
authors.forename: Chikako
authors.initials: C
authors.lastname: Suzuki
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miura
authors.forename: Daizo
authors.initials: D
authors.lastname: Okada
authors.forename: Wataru
authors.initials: W
authors.lastname: Komada
authors.forename: Munenaga
authors.initials: M
authors.lastname: Miyasaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
authors.forename: David
authors.initials: D
authors.lastname: Masuoka
mesh_terms: D001641:Bicuspid / Q000473:pathology; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D017220:Dentin-Bonding Agents / Q000737:chemistry; D055119:Elastic Modulus; D005898:Glass / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D019237:Tooth Cervix / Q000473:pathology*; D019228:Tooth Crown / Q000473:pathology; D014092:Tooth Root / Q000473:pathology; D019553:Tooth, Nonvital / Q000473:pathology
chemical_list: C112274:Clearfil Liner Bond 2; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D006047:Gold Alloys; D008689:Methacrylates; C438843:Panavia-Fluoro; D011140:Polyurethanes; D019279:Resin Cements; C009753:fiberglass; C091839:urethanetrimethacrylate