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[Designing metal frame removable partial dentures]

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Oral health care providers have the full responsibility for designing metal frame removable partial dentures and making all of the necessary preparations. Important principles of design are that the denture should hamper natural cleaning and daily oral hygiene as little as possible and that it should have good stability and retention. The designing process follows several phases without a strict chronological sequence. If it is necessary to return to a previous phase, the process follows a circular sequence. The usual phases are evaluating dental arch study casts, examining diagnostic set-ups, selecting abutment teeth, surveying dental arch study casts, selecting the major connector, selecting minor connector and clasp types, selecting artificial teeth, modifying the denture design from theoretically ideal towards practically optimal, and carrying out the intended tooth preparations in a dental arch study cast. Tooth preparations in the working cast together with a denture design prescription will provide the dental technician with the information needed for manufacturing the metal frame removable partial denture.

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... The general principles of the design that favor natural cleaning and daily oral hygiene measures and also have good retention and stability were followed (9) . In group I: thermoplastic denture base material was used which have higher flexibility, higher resistance to flexural fatigue, higher impact strength. ...
... In addition, a study showed that about 70% of the RPDs had some type of defect [10]. One of the main causes of RPD failure is the incorrect planning of the metal frame, which leads to unsatisfactory retention, instability and incurring impairment to the teeth and soft tissues [11][12][13]. The metallic frame of the RPD is usually composed of: retainer (direct and indirect, when needed), major connector, minor connector and saddle [14,15]. ...
p>Removable partial denture (RPD) is an important oral rehabilitation resource with an acceptable result even over a very long observation period. However, it is still difficult for many clinicians to make an appropriate RPD. One of the main causes of RPD failure is the missing or incorrect planning of the metal frame. Perhaps, this lack of planning occurs because of the difficulty that clinicians have to choose the components for the metallic frame among the enormous number of possibilities that exist. Thus, the present article aims to propose a simple sequence for the planning of metallic frames of the RPD following five steps: I) Classification of partially edentulous arches; II) Choice of the retainer (direct and indirect, when needed); III) Saddle drawing; IV) Choice of the major connector; and, V) Minor connector drawing. Keywords Dental prosthesis; Planning; Removable partial denture.</p
... An analysis of the dimensional ratio between the anatomical characteristics must be completed before a final decision on the design of the PSP is made by a therapist. Parallelometry and dental surveying is an essential component of PSP therapy [2] [3]. ...
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BACKGROUND: The morphology of the retention tooth often does not correspond with the required design; hence there is often an indication for enamel recontouring or other restorative procedures. AIM: The study aimed to determine the impact of changing the path of insertion of the prosthesis by reshaping the anatomical and morphological structures of the natural teeth predetermined for the retention of the prosthesis. MATERIAL AND METHODS: The group of 40 patients with Class II, Subclass 1 according to Kennedy was formed, and 120 approximal surfaces of retention teeth were obtained. Two different types of prostheses were made on the models: one group in the zero point position of the model, and another group in the zero position of the model, with changing of the direction of input at an angle of 2˚. RESULTS: The difference between the established and theoretical normal distribution of frequencies was tested with the Kolmogorov-Smirnov and Lilliefors tests (r < 0.10; r < 0.01). The first group showed a retention force of 0.08 N. In the second group the retention force was 0.94 N. CONCLUSION: It could be concluded that the change in the path of insertion of the dental prosthesis with conservative restorations as composite inlays, as well as the accurate extension of the prosthesis onto guiding plane surfaces, will undoubtedly increase the retention force of the prosthesis.
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