4. RPD bases Flashcards
(59 cards)
What is the base of the denture?
Portion that supports artifical teeth, rests on foundation tissues and replaces alveolar structures
What do the bases of RPDs face?
- foundation tissues on one side
- artifical teeth on the other side
What parts of the RPD replace lost structures due to edentulism? (2)
- Denture teeth
- Bases
Functions of RPD bases? (4)
- Attach the prosthetic teeth to RPD
- Be a supporting structure of the RPD: transfer occlusal forces to abutment teeth and tooth-tissue supported RPDs, to denture foundation area
- Replace missing alveolar tissue in volume and appearance
- Provide bracing, retention and in tooth-tissue supported RPDs direct-indirect retention
Base functions: attach the prosthetic teeth - Denture teeth are…
Individual units that should be attached to the bases to carry out their function
Base functions: attach the prosthetic teeth - Types of configuration of artificial teeth and RPD bases? (3)
- Teeth attached to acrylic resin in an extended base (with or without underlying meshwork)
- teeth attached to acrylic resin that is attached directly to a metal base (Shortened base)
- Metal occlusal surfaces
Base functions: attach the prosthetic teeth - which type of artificial tooth configuration is the most common?
Teeth attached to acrylic resin in an extended base (with or without underlying meshwork)
Base functions: attaching prosthetic teeth is useful because? (2)
- That way the bases help indirectly in mastication, deglutition, phonation and aesthetics
- Prevents horizontal and vertical tooth migration
Bases: support function for the RPD? (4)
- Resistancce of denture to vertical intrusive forces
- must be transferred homogeneously
- transferred to teeth and/or soft tissues
- if support is correct = less bone resorption
Bases function: Replace missing tissues? (3)
- Alveolar tissue - both bone and mucosa
- Restore non-tooth esthetics
- Lip and cheek support: restore face esthetics
Bases function: Provide additional retention? (3)
- Because of adhesion and cohesion
- in tissue supported and tooth-tissue supported
- Important at the mandible: no major connector provides retention
More contact surfaces with bases means
more retention
Bases function: How do they provide stability?
Also thanks to teeth
Bases need to be strong enough to resist … (5)
- Stresses which will be applied to it with the use of a thin base
- Have to bear forces and have adequate thickness
- fracture (toughness)
- deformation (Deformation)
- abrasion
Bases should be asethetic… (3)
- Specially at the anterior region
- smooth and polished surface
- non absorbent
Bases and hygiene? (2)
- Should not harbor microorganisms
- metal bases are the most hygenic
Why should bases be capable of adapting to supporting tissues ?
Improves retention by adhesion and cohesion
Bases and thermal conductivity?
Should be good thermal conductors
What should the weight for the bases be? (2)
- Low weight for the upper denture
- High weight for the lower one
Bases should be able to chemically …
bond to prosthetic tooth materials and RPD allows
length (extension) of base is determined by? (2)
- Number of missing teeth
- Retention, support and stability
Volume of the base will be determined by? (3)
- prosthetic space available
- amount of supporting tissue lost
- relationship between edentulous ridge and opposing arch
What are the types of base extensions? (3)
- Extended bases
- Reduced bases
- Shortened bases
What is an extended base?
- extension similar to complete dentures