Define “Indirect retention”. Describethe various components which can beused to provide it.

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Dental Technology Mapa Mental sobre Define “Indirect retention”. Describethe various components which can beused to provide it., creado por Alice Dolman el 27/04/2019.
Alice Dolman
Mapa Mental por Alice Dolman, actualizado hace más de 1 año
Alice Dolman
Creado por Alice Dolman hace alrededor de 5 años
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Define “Indirect retention”. Describethe various components which can beused to provide it.
  1. Indirect retention is a method which attempts to reduce the continual loading and unloading of tissues by preventing movement of the denture base away from the mucosal tissues. It uses an anteriorly placed component (on the hard or soft tissues) to prevent rotation occurring around a supporting unit (occlusal rest, onlay).
    1. Occlusal rests, onlays and continuous clasps, may act as indirect retainers. To carry out these functions they must be strong, rigid and fit tooth surfaces accurately.
    2. Occlusal rest
      1. a rigid extension of a removable partial denture onto the occlusal surface of a posterior tooth for support of the prosthesis.
      2. Onlay
        1. an occlusal rest portion of a removable partial denture that is extended to cover the entire occlusal surface of the tooth
        2. Continuous clasps
          1. Circumferential clasp of a removable partial denture in which the body is attached to an occlusal rest and the clasp arms extend across the buccal or lingual surfaces of more than one tooth before engaging a proximal surface undercut.
          2. Principles to be considered when considering incorporating supports in partial denture design.
            1. 1. The vertical load should be distributed over as many teeth as possible. One natural tooth to one artificial tooth. Hence as a saddle length increases, so should the number of supporting teeth.
              1. 2.Wherever possible, anterior and posterior bounded saddles should be supported.
                1. 3.Support is most effective when movement of the load-bearing tooth is prevented due to the presence of adjacent teeth.
                  1. 4. On an isolated standing tooth, support should be spread over both sides to prevent rotation.
                    1. 5. When designing a partial denture for free end saddles (Kennedy classes 1 & 2): By moving the support anteriorly, the load taken by the supporting tooth may be decreased, causing the load on the ridge to increase.
                      1. 6. Support should not interfere with occlusion or articulation. Any imbalance of the occlusal table can cause TMJ problems.
                      2. Materials
                        1. 1) Yellow or white casting golds.
                          1. 2) Cobalt Chromium casting alloys. (Rests made from this may be thinner than (1) above.)
                            1. 3) Wrought stainless steel. (These are used only temporarily since they cannot be adapted to fit tooth surfaces accurately.)
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