title: Photoelastic stress analysis of different post and core restoration methods.
abstract: The aim of this study was to compare three types of post and core systems by analyzing the stress magnitude within the root. To this end, two-dimensional photoelastic simulation models of endodontically treated maxillary central incisors were fabricated. Three different types of post and core systems were selected for this study: composite resin post and core, composite resin core in combination with a glass fiber post, and conventional cast metal post and core. The fabricated models were observed in a transmission polariscope with the same loading force (400 N) on 45 degrees palatal direction and the fringe orders registered were thereby analyzed. Results obtained in this study suggested that abutment build-up using composite resin core in combination with a glass fiber post model produced the lowest stress concentration and is hence effective in preventing stress concentration in the case of restored endodontically treated teeth.
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. mmk.y@nifty.com
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
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: David
authors.initials: D
authors.lastname: Masuoka
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D000044:Dental Abutments; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D055119:Elastic Modulus; D004853:Epoxy Resins / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000473:pathology; D008027:Light; D008422:Materials Testing; D008859:Microscopy, Polarization; D008953:Models, Anatomic; D010165:Palladium / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation; D033081:Shear Strength; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013440:Sulfides / Q000737:chemistry; D014092:Tooth Root / Q000473:pathology; D019553:Tooth, Nonvital / Q000473:pathology
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D004853:Epoxy Resins; D006047:Gold Alloys; D013440:Sulfides; C009753:fiberglass; C515871:poly(ethylene glycol)-stabilized poly(propylene sulfide); D012834:Silver; D011092:Polyethylene Glycols; D010165:Palladium