title: Root retention and removable partial denture design.
abstract: The position of a retained root for preservation of a ridge requires modification of the design of a distal-extension removable partial denture on the side of the retained root. A model with silicone rubber over the ridges and simulated retained roots was fabricated. A framework with mesial rests, distal proximal plates, and I-bar clasp arms was fitted to it. A pencil lead was attached to the framework to record the arcs of rotation of the I-bar clasp arm. The movements and the fulcrums of the prosthesis were changed by the presence of simulated retained roots posterior to the distal abutment.
mesh_terms: D000044:Dental Abutments; D003779:Denture Design; D003832:Denture, Partial, Removable; D006801:Humans; D008953:Models, Anatomic; D008954:Models, Biological; D012399:Rotation; D013314:Stress, Mechanical; D014092:Tooth Root / Q000502:physiology*