Strength of roots before and after endodontic treatment and restoration.
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.
Sornkul
E
E
Department of Restorative Dentistry, Tufts University, School of Dental Medicine, Boston, MA 02111, USA.
Stannard
J G
JG
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