RPD 5,6

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Author:
emm64
ID:
229569
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RPD 5,6
Updated:
2013-08-09 10:10:32
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RPD
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RPD 5,6
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  1. 1. What does RPI stand for?
    • Rest
    • Proximal plate
    • “I”-bar
  2. 2. What are the benefits (advantages) of I-bar retainer?
    • 1.Minimal tooth contact
    • 2.exact placement of retention contact
    • 3.Minimal interference with natural tooth contour.
    • 4.Maximum natural cleansing action.
    • 5.Reduced display of metal for better esthetics.
    • 6.Passive functional movement on the abutment adjacent to an extension-base
  3. 3. How does the selection of mesial or distal rests affect distal extension RPD dynamics?
    • rest should direct functional forces in the long axis of the tooth
    • use mesial rests
    • mesial rest produces a favorable load distribution to the abutment tooth
    • adjacent teeth helps brace and distribute some of the loads
    • A distal rest next to a distal extension base will adversely load the abutment tooth leading to the distal movement of that tooth and bone loss.
    • Mesial rest results in more vertical direction of force on the edentulous area
  4. 4. How does the selection of mesial or distal rests affect the direction of force on the abutment in distal extension RPDs?
    • rest should direct functional forces in the long axis of the tooth
    • mesial rest produces a favorable load distribution to the abutment tooth
    • adjacent teeth helps brace and distribute some of the loads
    • A distal rest next to a distal extension base will adversely load the abutment tooth leading to the distal movement of that tooth and bone loss.
    • Mesial rest results in more vertical direction of force on the edentulous area
  5. 5. How does the selection of mesial or distal rests affect the movement of the I-bar in distal extension RPDs?
    • With a distal rest I bar anterior to the axis of rotation will move upward, forward, and into the undercut… therefore creating adverse loading.
    • mesial rest I bar will move downward, forward, and out of the undercut… therefore not creating adverse loading.
  6. 6. What is the axis of rotation? When does it exist?
    Passes through the rest closest to the extension base edentulous area and the farthest rest - Only exist in extension-base RPDs
  7. 7. Retainers placed away from the axis of rotation must be active or passive? Why?
    Passive functional movement on the abutment adjacent to an extension-base
  8. 8. What is the reciprocation? What is the concept of encirclement? Describe three ways to accomplish the reciprocation.
    • Reciprocation: mechanism by which lateral forces generated by a retentive clasp passing over a
    • height of contour are counterbalanced by a reciprocal clasp passing
    • 1. Rigid and Passive Lingual Plate
    • 2. Rigid and Passive (non-retentive) retainer
    • 3. Mesial rest and distal proximal plate in RPI assembly
  9. 9. What are the contraindications for I-bars?
    • Severely tilted tooth (no undercut or too much undercut)
    • Severe soft tissue undercuts
    • Shallow buccal or labial vestibules
  10. Tooth Borne
    • Abutment teeth border all edentulous areas
    • 1. Functional forces are transmitted through abutment teeth to bone
    • Biomechanical Characteristics:
    • 2. No rotational movement under functional force
    • 3. Rests can be placed in any position and choice of retainers is not critical because there is no rotational movement.
  11. Extension Base Removable Partial Dentures
    • --A removable partial denture that is supported and retained by natural teeth only at one end of the denture base and in which the functional forces are transmitted through abutment teeth & mucosa of the edentulous ridge to bone --Two types: Distal extension & Anterior extension RPDs
    • With the combination of tooth and mucosal support the extension base RPD exhibits uneven movement if patient chews on the extension base edentulous area --This factor must be fully understood and analyzed in planning the RPD design
  12. Different Displacement Between PDL & Mucosa
    • Periodontal ligament (0.25mm)
    • Mucosa (2.0mm)
  13. What is combination case?
    require restorative treatment (fillings, or crown, or bridge) on the tooth/teeth that will serve as abutment(s) for the following RPD.
  14. Survey Crown
    • crown abutment tooth for a removable partial denture. 
    • include parallel guide plane(s) which establish a path of insertion & removal for the partial denture
    • built-in rest seats and retention/reciprocation area into which the denture's metal framework will engage when seated.
  15. How to work up the treatment plan for these cases?
    • Pre-ATP workup: 
    • Mounted diagnostic casts (impression for study casts, jaw records) 
    • Tentative plan and tentative RPD design
    • Based on the overall recommended treatment plan,
    • finalize the definitive RPD or treatment partial design with the removable consultation instructors before you start any treatment
    • (Surveying, determining the MAP for RPD, identify the required prep area for all RPD abutments)
  16. What is the treatment sequence to manage combination cases?
    Prepare the guide planes and rests of RPD abutments first based on your finalized RPD design and MAP, then move on to the fixed restorations and fillings, followed by the removable prosthesis
  17. Why is the proper treatment sequence so important for combination cases?
    Inadequate thickness of the amalgam is prone to fracture after the tooth alteration for RPD framework
  18. The importance of diagnostic setup & various guidance to facilitate the fixed prep and fixed lab work
    Use diagnostic wax denture setup on the record base as a guide to visualize the ideal plane of occlusion=>Have your patient wear it to check occlusal clearance and axial reduction during your fixed preparation

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