title: Strength of roots before and after endodontic treatment and restoration.
abstract: The resistance to fracture of mandibular premolar roots before and after endodontic and restorative procedures was tested. Seven treatment groups were evaluated. A Universal testing machine was used to apply vertical and lateral (45-degree) forces. Overall, the untreated roots showed the highest resistance to fracture. Factors of importance to prevent fracture were found to be (a) the amount of remaining tooth structure; (b) strength of post and core; and (c) bonding between core material and dentin. These factors suggest that a composite core following the use of EDTA to remove the smear layer may be a successful treatment when sufficient tooth structure remains.
authors.affiliation: Department of Restorative Dentistry, Tufts University, School of Dental Medicine, Boston, MA 02111, USA.
authors.forename: E
authors.initials: E
authors.lastname: Sornkul
authors.forename: J G
authors.initials: JG
authors.lastname: Stannard
mesh_terms: D001641:Bicuspid; D019245:Compressive Strength; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000009:adverse effects; D003799:Dental Stress Analysis; D006801:Humans; D008334:Mandible; D008422:Materials Testing; D011176:Post and Core Technique; D012390:Root Canal Therapy / Q000009:adverse effects; D014082:Tooth Fractures / Q000503:physiopathology*; D014092:Tooth Root / Q000293:injuries* / Q000502:physiology*; D019553:Tooth, Nonvital / Q000503:physiopathology