title: Evaluation of photoelastic stress patterns produced by various designs of bilateral distal-extension removable partial dentures.
abstract: The results of this study showed that: 1. The design of a retainer with a mesial rest in conjunction with a buccal I-bar or a wrought-wire and cast lingual arm exhibited the most favorable distribution of vertically applied forces. 2. Retainer designs with a distal rest tend to move the clinical crown distally and the root mesially at the apex, resulting in horizontal forces in the bone. 3. Placing rests of distal-extension removable partial dentures more anteriorly provides an axis of rotation that directs applied forces in a more vertical direction. 4. The distal rest in conjunction with circumferential retainers developed greater horizontal forces within the supporting structures.
mesh_terms: D002858:Chromium Alloys; D000044:Dental Abutments; D003799:Dental Stress Analysis; D003819:Denture Bases; D003779:Denture Design; D003832:Denture, Partial, Removable; D006801:Humans; D008953:Models, Anatomic; D008954:Models, Biological; D010519:Periodontium / Q000033:anatomy & histology / Q000502:physiology*; D010969:Plastics
chemical_list: D002858:Chromium Alloys; D010969:Plastics