title: Influence of ridge inclination and implant localization on the association of mandibular Kennedy class I removable partial denture.
abstract: The aim of this study was to evaluate the tendency of displacement of the supporting structures of the distal extension removable partial denture (DERPD) associated to the implant with different inclinations of alveolar ridge and implant localizations through a two-dimensional finite-element method. Sixteen mandibular models were fabricated, presenting horizontal, distally descending, distally ascending, or descending-ascending ridges. All models presented the left canine and were rehabilitated with conventional DERPD or implant-retained prosthesis with the ERA system. The models were obtained by the AutoCAD software and transferred to the finite-element software ANSYS 9.0 for analysis. A force of 50 N was applied on the cusp tips of the teeth, with 5 points of loading of 10 N. The results were visualized by displacement maps. For all ridge inclinations, the assembly of the DERPD with distal plate retained by an anterior implant exhibited the lowest requisition of the supporting structures. The highest tendency of displacement occurred in the model with distally ascending ridge with incisal rest. It was concluded that the association of the implant decreased the displacement of the DERPD, and the anterior positioning of the implant associated to the DERPD with the distal plate preserved the supporting structures for all ridges.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University-UNESP, São Paulo, Brazil.
authors.forename: Lígia Del' Arco Pignatta
authors.initials: LD
authors.lastname: Cunha
authors.forename: Eduardo Piza
authors.initials: EP
authors.lastname: Pellizzer
authors.forename: Fellippo Ramos
authors.initials: FR
authors.lastname: Verri
authors.forename: Rosse Mary
authors.initials: RM
authors.lastname: Falcón-Antenucci
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
mesh_terms: D000539:Alveolar Process / Q000601:surgery*; D017076:Computer-Aided Design; D003758:Dental Implantation, Endosseous; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D003832:Denture, Partial, Removable; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible / Q000601:surgery*; D003765:Models, Dental; D012984:Software