title: Stress distribution in roots restored with different types of post systems with composite resin.
abstract: Although composite resin core is used with various types of prefabricated posts, it remains unclear which kind of material is most suitable for the post. The aim of this study was to evaluate the influence of prefabricated posts on the stress distribution within the root by finite element analysis. Posts and cores were built up with composite resin and four types of prefabricated posts: two types of glass fiber posts (GFP1, GFP2) with low and high Young's moduli, a titanium post (TIP), and a stainless steel post (SSP). In all models, stress distribution during function was calculated. There were differences in stress concentration at the root around the end of posts. The magnitudes of stress for GFP1, GFP2, TIP, and STP were 8.7, 9.3, 11.7, and 13.9 MPa respectively. Given the results obtained, GFP1 was the most suitable material for post fabrication since this model showed a lower stress value. It would therefore mean a lower possibility of root fracture.
authors.affiliation: Fixed Prosthodontics, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan. d.okada.fpro@tmd.ac.jp
authors.forename: Daizo
authors.initials: D
authors.lastname: Okada
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miura
authors.forename: Chikako
authors.initials: C
authors.lastname: Suzuki
authors.forename: Wataru
authors.initials: W
authors.lastname: Komada
authors.forename: Chiharu
authors.initials: C
authors.lastname: Shin
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
authors.forename: David
authors.initials: D
authors.lastname: Masuoka
mesh_terms: D000328:Adult; D001732:Bite Force; D003188:Composite Resins / Q000737:chemistry*; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D005898:Glass; D006801:Humans; D008297:Male; D011176:Post and Core Technique / Q000009:adverse effects / Q000295:instrumentation*; D013193:Stainless Steel; D014025:Titanium; D014082:Tooth Fractures / Q000209:etiology / Q000517:prevention & control; D014092:Tooth Root / Q000033:anatomy & histology / Q000502:physiology*; D019553:Tooth, Nonvital / Q000473:pathology
chemical_list: D003188:Composite Resins; C009753:fiberglass; D013193:Stainless Steel; D014025:Titanium