1. Explain why Ni-Cr alloy is not the choice of RPD framework material
    • Ni:
    • Known allergen that affects approximately 6% of population
    • May cause dermatitis (contact or systemic)
  2. •Describe the advantages and drawbacks of using Titanium alloy for RPD framework
    • Desirable Characteristics:
    • • low weight-to-volume (low density)
    • • high strength-to-weight
    • • fatigue resistance
    • • corrosion resistance
    • • biocompatibility
    • Laboratory drawbacks still remain:
    • (1) Lengthy burn-out
    • (2) Inferior castability and machinability Studies showed higher internal porosity on Titanium RPD castings, especially at the clasp assemblies.
    • (3) Reaction layer formed on the cast surface,
    • (4) Difficulty of polishing
    • (5) High initial costs
  3. •What are the advantages of Co-Cr as the most commonly used RPD framework material
    • Good corrosion resistance
    • High strength
    • High modulus of elasticity(stiffness)
    • Low density(weight)
    • Low $
  4. •Explain why all plastic polyacetal RPD is not recommended
    • extremely low Modulus of elasticity (Young’s modulus, stress/strain ratio, material stiffness )
    • polyacetal resin RPD concentrated the highest stresses to distal lateral wall of the roots adjacent to the single edentulous space and to the bone.
  5. •Describe the ideal RPD retainer configuration
    • •Smooth
    • •Tapering (continuous)
    • •No sharp angles
    • some flexibility must be attained at the retainers for engaging/disengaging of retention area…
  6. •Describe the ideal rest/minor connector configuration to minimize the risk of component fracture
    • • Smooth contour
    • • Adequate size
    • • No sharp angles
  7. •Describe the differences between resin versus porcelain denture teeth
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  8. What is a removable partial denture made of?
    • •Metal framework: Co-Cr alloy is most commonly used
    • •Denture teeth: resin or porcelain denture teeth
    • •Denture Base Pink acrylic resin
Card Set