RPD Manual 11 - Removable Prosthodontics - Dalhousie University

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D. Anterior Palatal Plate (U-Shaped Or "Horse-Shoe" Palatal Connector) From a biomechanical standpoint the palatal horseshoe is a poor connector and should never be used unless absolutely necessary. To be rigid, the horseshoe connector must have bulk in the rugae area where the tongue requires freedom. Without sufficient bulk the U-shaped design becomes flexible and allows movement posteriorly. In distal extension partial dentures where posterior tooth support is nonexistent, movement is particularly noticeable and is traumatic to the residual ridge causing continual irritation during function. Major Connectors - 37 The anterior palatal plate should only be prescribed where the torus palatinus prohibits the use of other connectors.
Minor Connectors - 38 Definition Minor Connectors A unit of a partial denture which connects other components (e.g. direct retainer, indirect retainer, denture base, etc.) to the major connector. Functions 1. Provide unification and rigidity 2. Provide stress distribution by transferring stresses from the major connector to other parts of the partial denture and from the partial denture to the abutment teeth 3. Act as bracing elements through contact with guiding planes opposing the retentive arms. 4. Maintain a path of insertion via contact with guiding planes Basic Types of Minor Connectors: a. Minor connectors placed into embrasures between two adjacent teeth. These connectors should be somewhat triangular shaped in cross section to minimize intrusion into the tongue or vestibular spaces, while still providing adequate bulk for rigidity (a). A minor connector should join the major connector at a right angle and cover as small an area of tissue as possible (b). The juncture to the major connector should be rounded (arrow) not sharp (X) unless the juncture includes an acrylic finish line. Relief should be placed on the master cast so that the minor connector does not lie directly on the soft tissue (c). A minor connector should fill the embrasure space so that a smooth surface is presented to the tongue and so that areas where food can be trapped are minimized. Ideally, a minor connector should not contact the teeth gingival to the height of contour. If a minor connector fits tightly against an abutment below the height of contour, a wedging force may be created during functional movements of the framework. This wedging can result in increased tooth mobility. Alternatively, it may be difficult to seat or unseat the framework. b. Gridwork minor connectors that connect the denture base and teeth to the major connector. These minor connectors are adjacent edentulous spaces and usually connect the major connector to a clasp assembly as well. Gridworks can be an open lattice work or mesh type. The mesh type tends to be flatter, with more potential rigidity. Conversely the mesh has been shown provide less retention for the acrylic if the openings are insufficiently large. The lattice type has superior retentive potential, but can interfere with the setting of teeth, if the struts are made too thick or poorly positioned. Both types are acceptable if correctly designed.
Page 1 and 2: Removable Partial Denture Manual Ro
Page 3 and 4: Table of Contents Table of Contents
Page 5 and 6: Table of Contents -iii Principles o
Page 7 and 8: Table of Contents - 2 4. poor progn
Page 9 and 10: Table of Contents - 4 F. Classifica
Page 11 and 12: Anatomy Tour - 6 Anatomy Tour for C
Page 13 and 14: Anatomy Tour - 8 ! Soft Palate ! Vi
Page 15 and 16: Anatomy Tour - 10 OTHER STRUCTURES:
Page 17 and 18: Preliminary Impressions - 12 6. Wra
Page 19 and 20: Surveying, Path of Insertion, Guidi
Page 29 and 30: Rests and Rest Seats - 24 A. Defini
Page 31 and 32: Rests and Rest Seats - 26 (d) The f
Page 33 and 34: Rests and Rest Seats - 28 Correct P
Page 35 and 36: Rests and Rest Seats - 30 2. The in
Page 37 and 38: Major Connectors - 32 Definition Ma
Page 39 and 40: Major Connectors - 34 3. Position -
Page 41: Major Connectors - 36 B. Full Palat
Page 45 and 46: Minor Connectors - 40 The junction
Page 47 and 48: Minor Connectors - 42 When the dent
Page 49 and 50: Direct and Indirect Retainers - 44
Page 65 and 66: Denture Bases - 60 Advantages: Bead
Page 67 and 68: Denture Bases - 62 of the natural d
Page 69 and 70: Principles of Partial Denture Desig
Page 77 and 78: Design Session - 72 Classification
Page 85 and 86: Clinical Protocol, Final Impression
Page 87 and 88: Clinical Protocol, Final Impression
Page 89 and 90: Framework Adjustment - 84 Removable
Page 91 and 92: Framework Adjustment - 86 3. Silico
Page 93 and 94:
Framework Adjustment - 88 after adj
Page 95 and 96:
Jaw Relations, Altered Cast Techniq
Page 97 and 98:
Jaw Relations, Altered Cast Techniq
Page 99 and 100:
Interim Removable Partial Dentures
Page 101 and 102:
Coordinating Fixed and Removable Pr
Page 103 and 104:
RPD Checklist - 98 7. Abutment Modi
Page 105 and 106:
RPD Checklist - 100 16. Baseplate a
Page 107 and 108:
Summary of Design Principles for Re
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RPD Manual 11 - Removable Prosthodontics - Dalhousie University

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