Week 5 - Components of RPD AI Flashcards
(23 cards)
What is the main function of major connectors in a cast RPD?
Unification of the major parts of the prosthesis and distribution of applied force throughout the arch.
Major connectors also minimize torque to the teeth and restrict movement for cross-arch stability.
Define major connectors in the context of RPDs.
Components that connect parts of the prosthesis located on one side of the arch to those on the opposite side.
What are the location requirements for major connectors?
Should be away from movable tissue, no impingement on gingival tissue, and clear from bony and soft tissue prominences.
List the types of mandibular major connectors.
- Lingual bar
- Linguoplate
- Sublingual bar
- Lingual bar with cingulum bar
- Cingulum bar (continuous bar)
- Labial bar
What is the primary difference between a Lingual Bar and a Sublingual Bar?
Lingual Bar is higher and requires at least 8 mm of vertical space, while Sublingual Bar is lower and used when there’s limited vertical space.
What is a linguoplate in the context of RPDs?
A plate bordered by a lingual bar, minor connectors, anterior teeth contact, and cingula.
What are direct retainers in RPDs?
Components that engage a specific tooth to resist dislodgment of the denture.
What is the function of indirect retainers in RPDs?
Prevent rotational displacement of the denture about the rests of the principal abutment teeth.
What are the three types of rests in RPDs?
- Occlusal rest
- Cingulum rest
- Incisal rest
What is the role of minor connectors in RPDs?
Connect major connectors to other components like rests and clasp assemblies.
Fill in the blank: The _______ provides resistance against dislodging movements in RPDs.
retainer (clasp)
What are the characteristics of minor connectors?
- Rigid
- Located in the embrasure
- Wider in the lingual side and tapered toward contact area
- Connected vertically to the major connector
What are the indications for using a linguoplate?
- Lack of space or high lingual frenum
- Flat ridge
- Stabilizing teeth with mobility
- Future replacement of anterior teeth expected
What is an indirect retainer?
A component positioned on a tooth away from the denture’s fulcrum line to resist rotational forces.
True or False: A linguoplate can serve as an indirect retainer.
False
What are the advantages of a single palatal strap major connector?
Suitable rigidity without excessive bulk.
What is the disadvantage of U-shape palatal connectors?
Flexibility and potential instability under heavy chewing forces.
What should all clasp assemblies provide?
- Support (occlusal rests)
- Reciprocation
- Stability
- Retention
What is the R-P-I clasp assembly composed of?
- R - rest (always mesial)
- P - proximal plate
- I - I-bar (retentive arm)
What does the term ‘reciprocation’ refer to in RPDs?
The mechanism that counteracts the forces applied by the clasp arm on a tooth during insertion, removal, or function.
What is a ring clasp?
A clasp that encircles a tooth, typically a molar or premolar, providing retention and stability for the denture.
What are the indications for using anterior-posterior palatal straps/bars?
May be used in almost any maxillary partial denture.
What is a major concern when using a linguoplate?
It can impair periodontal health and maximize tissue coverage.
