RPD week 3

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emm64
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228205
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RPD week 3
Updated:
2013-07-26 00:42:54
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RPD week
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RPD week 3
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  1. 1. What are the five parts of RPD metal framework?
    • Rests
    • Proximal Plates/Minor Connector
    • Major Connectors
    • Denture Base Connectors
    • Retainers
  2. 2. What is the recommended design sequence for the five parts?
    • Rests
    • Minor Connectors/Proximal Plates 
    • Major Connectors 
    • Denture Base Connectors
    • Retainers
  3. 3. What is the primary function of rests?
    • primarily vertical support on the abutment teeth.
    • direct functional forces in the long  axis of the tooth.
  4. 4. Describe the concept of positive rests?
    • center is deeper
    • slightly deeper at the tip than the marginal ridge area
    • must not allow a RPD to slide off the tooth when in function
  5. 5. How do you accomplish the positive rest?
    • slightly deeper at the tip than the marginal ridge area. 
    • A properly prepared molar occlusal rest is spoon-shaped in its cross-sectional view
  6. 6. What is the most important mechanical requirement for major connectors? Why is that important?
    • Rigidity: Unite and utilize all remaining structures of the arch to provide the greatest potential to 
    • distribute and share functional forces
  7. 7. Which type of maxillary major connectors is most commonly used?
    • Anterior-posterior connector ( Double strap type)
    • provides optimal rigidity with minimum bulk and coverage.
    • posterior palatal metal connector should not extend beyond the vibrating line of the palate
  8. 8. Name other types of maxillary major connectors and the indications for each?
    • Single strap-type: Has to be thick and wide enough, no distal extension
    • U-shaped (Horseshoe type): palatal tori
    • Complete coverage: only anteriors remained, and/or periodontally compromised. When future anterior extension considered.
  9. 9. Which type of mandibular major connectors is the choice of design whenever possible? What is the anatomical requirement for the design? When not feasible, what is the alternative?
    • Lingual Bar: Sufficient space (7-8mm) must be available between the floor of the mouth (lingual frenum) and the crest of the gingiva.
    • 2. The superior portion of the bar is positioned well away (3mm) from the gingival crest tissue. 
    • The lingual bar is the design of choice whenever possible because of simplicity and minimal tooth and mucosa contact.
    • Lingual Plate: clinical examination indicates a high lingual frenum and floor of mouth attachments, with insufficient space (<7-8mm) to place a lingual bar
    • When the anterior teeth are periodontally compromised and a support from the lingual side deemed benifitial.
  10. 10. What is the butt-joint junction between the acrylic base and metal framework called?
    Finishing line
  11. A ____________ is designed at the anterior and posterior margins of the posterior connector to provide a seal.
    light post-dam
  12. Mandibular major connector cannot be __________ in design.
    circular
  13. The _____________ is the portion of the framework that contacts the proximal side of the tooth, is also considered a minor connector.
    proximal plate

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