RPD Manual 11 - Removable Prosthodontics - Dalhousie University

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Preliminary Impressions - 13 Trimming 1. Make sure the model is moist during trimming, so that debris from the trimmer does not attach to the cast. Soak the model by immersing it in slurry water, or by allowing just the base of cast to contact clear tap water. Prolonged immersion in tap water can lead to erosion of the cast. 2. Cast should be minimum of 10-12mm (.5 inch) in thinnest part 3. Trim the base on the model trimmer parallel to ridges. 4. Leave the mucous membrane reflection intact for making a custom tray 5. The casts should have the following contours and dimensions: Cross Section through Casts Master Cast Diagnostic Cast For Master casts, impressions are boxed and trimmed with a 3mm wide by 3mm deep land area to aid in processing of acrylic. For diagnostic casts used for making custom trays, the land area should be omitted so that the tray material is easier to trim and remove from the cast Outline of Bases for Trimmed Casts Follow the contour of the ridges, with rounded angles
Surveying, Path of Insertion, Guiding Planes - 14 Surveying, Path of Insertion, Guiding Planes A path of insertion (or removal) is the path along which a prosthesis is placed (or removed) intraorally. A removable partial denture is usually fabricated to have a single path of insertion or removal from the mouth. A single path of insertion is advantageous because it: 1. equalizes retention on all abutments 2. provides bracing and cross-arch stabilization of teeth 3. minimizes torquing forces of the partial denture 4. allows the partial denture to be removed without encountering interferences 5. directs forces along the long axes of the teeth 6. provides frictional retention from contact of parallel surfaces on the teeth In order to provide a single path of insertion for a partial denture, some axial surfaces of abutments must be prepared so that they parallel the path of insertion. These parallel surfaces are called guiding planes. Guiding planes are prepared wherever rigid components of a partial denture contact abutment teeth. Specifically, guiding planes should usually be prepared for: 1. Proximal plates 2. Bracing arms 3. Rigid portions of retentive clasps The dental surveyor is a diagnostic instrument used to select the most favorable path of insertion and aid in the preparation of guiding planes. It is an essential instrument in designing removable partial dentures. The act of using a surveyor is referred to as surveying. Other Uses of a Surveyor: 1. Locating soft tissue undercuts, which can influence the extent of the denture base, the type of direct retainers and the path of insertion selected. 2. Contouring wax patterns for fixed restorations that will be partial denture abutments. 3. Machining parallel surfaces on cast restorations. 4. Blocking out undesirable undercuts on master casts. 5. Placing intracoronal retainers (precision attachments). 6. Recording the cast position in relation to the selected path of insertion (tripoding).
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: Preliminary Impressions - 12 6. Wra
Page 21 and 22: 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 and 42: Major Connectors - 36 B. Full Palat
Page 43 and 44: Minor Connectors - 38 Definition Mi
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
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Principles of Partial Denture Desig
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Design Session - 72 Classification
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Clinical Protocol, Final Impression
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Clinical Protocol, Final Impression
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Framework Adjustment - 84 Removable
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Framework Adjustment - 86 3. Silico
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Framework Adjustment - 88 after adj
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Jaw Relations, Altered Cast Techniq
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Jaw Relations, Altered Cast Techniq
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Interim Removable Partial Dentures
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Coordinating Fixed and Removable Pr
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RPD Checklist - 98 7. Abutment Modi
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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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