RPD Manual 11 - Removable Prosthodontics - Dalhousie University

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Direct and Indirect Retainers - 53 The I-bar and the proximal plate disengage the abutment tooth and thereby reduce torquing of the tooth. This is an accurate deduction. Therefore the RPI design be used wherever possible. However, an I-bar cannot be used routinely due to the fact that a tissue undercut frequently exists in the region of the abutment. A distal rest concept has drawbacks if designed incorrectly. If the guiding plane on the distal surface of the abutment covers the entire length of the tooth, loading of the denture base will cause the minor connector contacting the guiding plane to act as a "wrench" and torque the tooth. However, if a short guiding plane is prepared with a relief area between the converging surface of the tooth and the minor connector, the distal tilting of the abutment can be prevented or minimized. During distal loading, the minor connector could move into the relief area and the rest would be permitted to escape from the rest seat. This would change the fulcrum point from point A to point B, driving the abutment tooth mesially against adjacent tooth. However, if the retentive arm is place into a mesiobuccal undercut, torquing might still occur, since the retentive tip would tend to rotate in an occlusal direction, thereby engaging the tooth. To minimize the activating effect of the retentive arm, a wrought wire arm should be used (greater flexibility, less ability to torque). In addition and where possible, the retentive undercut should be place in the mid-buccal of the tooth, with the mesial clasp tip placed above the height of contour. Thus occlusal movement of the clasp tip will disengage rather than engage the tooth. Similarly, lingual bracing arms should not be carried too far into embrasures in distal extension cases, since tissueward movement could also result in torquing forces being placed on the abutments.
Direct and Indirect Retainers - 54 If the distal rest retainers are correctly designed, they can be just as effective and safe as the mesial rest retainer.
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 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 57: Direct and Indirect Retainers - 52
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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