title: Comparative stress distribution of implant-retained mandibular ball-supported and bar-supported overlay dentures: a finite element analysis.
abstract: Implant-retained mandibular ball-supported and bar-supported overlay dentures are the two most common treatment options for the edentulous mandible. The superior option in terms of strain distribution should be determined. The three-dimensional model of mandible (based on computerized tomography scan) and its overlying implant-retained bar-supported and ball-supported overlay dentures were simulated using SolidWorks, NURBS, and ANSYS Workbench. Loads A (60 N) and B (60 N) were exerted, respectively, in protrusive and laterotrusive motions, on second molar mesial, first molar mesial, and first premolar. The strain distribution patterns were assessed on (1) implant tissue, (2) first implant-bone, and (3) second implant-bone interfaces. Protrusive: Strain was mostly detected in the apical of the fixtures and least in the cervical when bar design was used. On the nonworking side, however, strain was higher in the cervical and lower in the apical compared with the working side implant. Laterotrusive: The strain values were closely similar in the two designs. It seems that both designs are acceptable in terms of stress distribution, although a superior pattern is associated with the application of bar design in protrusive motion.
authors: Prosthodontics Department, School of Dental Medicine, Hamadan University of Medical Sciences (UHSHA), Hamadan, Iran.
authors: Fariborz
authors: F
authors: Vafaei
authors: Masoumeh
authors: M
authors: Khoshhal
authors: Saeed
authors: S
authors: Bayat-Movahed
authors: Ahmad Hassan
authors: AH
authors: Ahangary
authors: Farnaz
authors: F
authors: Firooz
authors: Alireza
authors: A
authors: Izady
authors: Vahid
authors: V
authors: Rakhshan
mesh_terms: D003198:Computer Simulation; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods; D003781:Denture Retention / Q000295:instrumentation*; D003828:Denture, Overlay; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging; D008334:Mandible; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed