title: Implant-retained mandibular bar-supported overlay dentures: a finite element stress analysis of four different bar heights.
abstract: Proper stress distribution on dental implants is necessary in bar-retained implant overlay dentures. We aimed to comparatively assess this stress distribution according to different bar heights using finite element models. A three-dimensional (3D) computer model of mandible with 2 implants (ITI, 4.1 mm diameter and 12 mm length) in canine areas and an overlying implant-supported bar-retained overlay denture were simulated with 0-, 1-, 2-, and 3-mm bar heights using ABAQUS software. A vertical force was applied to the left first molar and gradually increased from 0 to 50 N. The resultant stress distribution was evaluated. Bars of 1 and 2 mm in height transferred the least stress to the implants (3.882 and 3.896 MPa, respectively). The 0-mm height of the bar connection transferred the highest stress value (4.277 MPa). The amount of stress transferred by 3-mm heights of the bar connection was greater than that of 1- and 2-mm bar connections and smaller than that of 0-mm bar connection (4.165 kgN). This 3D finite element analysis study suggested that the use of Dolder bar attachment with 1- and 2-mm heights could be associated with appropriate stress distribution for implant-retained overlay dentures.
authors.affiliation: Department of Fixed Prosthodontics, Torabinejad Research Center, School of Dental Medicine, Isfahan University of Medical Sciences (MUI), Isfahan, Iran.
authors.forename: Mansoor
authors.initials: M
authors.lastname: Rismanchian
authors.forename: Mansour
authors.initials: M
authors.lastname: Dakhilalian
authors.forename: Farshad
authors.initials: F
authors.lastname: Bajoghli
authors.forename: Ehsan
authors.initials: E
authors.lastname: Ghasemi
authors.forename: Pooyan
authors.initials: P
authors.lastname: Sadr-Eshkevari
mesh_terms: D003198:Computer Simulation; D003481:Cuspid; D003724:Dental Arch / Q000033:anatomy & histology; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D003779:Denture Design; D003781:Denture Retention / Q000295:instrumentation*; D003826:Denture, Complete, Lower; D003828:Denture, Overlay; D055119:Elastic Modulus; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008334:Mandible / Q000033:anatomy & histology; D008422:Materials Testing; D008953:Models, Anatomic; D008954:Models, Biological; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry
chemical_list: D015921:Dental Implants; D003764:Dental Materials; D014025:Titanium