QUESTIONS IN RESTORATIVE DENTISTRY

 1. 6 factors to be considered for patient for RPD

2. Phases required for treatment of partially edentulous patient and explain it

3. Instruments for designing RPD

4. Application of a surveyor

5. Component of RPD

6. 3 Functions of each components

7. What is RPI

8. Describe it mechanisms of it action as it applied to it's indications in both Kennedy class i and ii RPI

9. List 7 principles of RPD designs

10. Briefly describe each principles

11. List 7 steps in the fabrication of metal framework for RPD

12. List 3 problems encountered during it tryin

13. What is the term altered cast technique mean

14. Describe how the procedure is carried out

15. Briefly describe 6 functional requirement of a clasp

16. Briefly describe 5 factors that affect flexibility of a clasp

17. List 6 factors govern the chance of a retentive clasp

Answer

1. Factors for RPD Patient Selection:

• Oral and periodontal health
• Patient's ability to maintain oral hygiene
• General health and cooperation
• Psychological considerations
• Financial considerations
• Anatomical factors such as ridge form and residual tooth support

2. Phases of Treatment for Partially Edentulous Patient:

• Assessment and Diagnosis: Evaluate oral health, patient history, and treatment needs.
• Treatment Planning: Develop a comprehensive plan considering patient factors and prosthesis design.
• Tooth Preparation: Modify teeth to accommodate components like rests and clasps.
• Impressions: Capture accurate impressions for cast models.
• Try-in: Evaluate fit and esthetics with a trial prosthesis.
• Delivery: Provide the final partial denture.

3. Instruments for Designing RPD:

• Surveyor
• Surveyor's dye
• Calipers
• Dividers
• Mouth mirror
• Periodontal probe

4. Application of a Surveyor:

• Guides the positioning of components during the design phase.
• Assesses and records undercuts in the cast.
• Aids in achieving parallelism of guiding surfaces.

5. Components of RPD:

• Major connector
• Minor connector
• Rest
• Direct retainer (clasp)
• Denture base

6. Functions of RPD Components:

• Major Connector: Connects and stabilizes various parts of the prosthesis.
• Minor Connector: Joins other components, providing support and rigidity.
• Rest: Distributes occlusal forces to supporting teeth.
• Direct Retainer (Clasp): Engages undercuts, offering retention.
• Denture Base: Supports artificial teeth and distributes occlusal loads.

7. RPI (Rest, Proximal Plate, I-bar):

• An RPI system is a modification in removable partial denture design.
• It combines a rest, proximal plate, and I-bar clasp.

8. Mechanisms of RPI Action:

• Class I (Kennedy I): The rest provides stability, the proximal plate resists rotational movement, and the I-bar clasp engages undercuts for retention.
• Class II (Kennedy II): Similar to Class I, but additional support is needed on the distal extension side.

9. Principles of RPD Design:

• Preservation of remaining teeth.
• Minimal tissue coverage.
• Effective distribution of occlusal forces.
• Proper use of direct retainers.
• Stability and support.
• Esthetics.
• Ease of maintenance.

10. Brief Description of Principles:

• Preservation of remaining teeth: Retain healthy teeth and distribute functional loads.
• Minimal tissue coverage: Preserve oral tissues, enhancing comfort.
• Effective distribution of occlusal forces: Prevent overloading of supporting structures.
• Proper use of direct retainers: Ensure secure retention without damaging abutment teeth.
• Stability and support: Enhance stability for functional efficiency.
• Esthetics: Consider appearance and patient satisfaction.
• Ease of maintenance: Facilitate oral hygiene and maintenance of the prosthesis.

11. Steps in Fabrication of Metal Framework for RPD:

• Framework design.
• Surveying and marking.
• Tooth preparation.
• Impression making.
• Framework try-in.
• Framework adjustment.
• Final framework fabrication.

12. Problems Encountered during Framework Try-in:

• Inadequate fit.
• Clasp interference.
• Occlusal discrepancies.

13. Altered Cast Technique:

• A method to compensate for processing changes in the cast framework.
• A duplicate cast is made after processing the wax pattern.

14. Procedure for Altered Cast Technique:

• Duplicate the cast after wax pattern processing.
• Pour duplicate cast with refractory material.
• Adjust the refractory cast to match the processed metal framework.
• Fabricate denture using the altered cast.

15. Functional Requirements of a Clasp:

• Retention.
• Stability.
• Reciprocation.
• Encirclement of tooth.
• Minimal interference with oral hygiene.
• Esthetic compatibility.

16. Factors Affecting Flexibility of a Clasp:

• Material type.
• Cross-sectional shape.
• Length of the clasp arm.
• Thickness of the clasp arm.
• Design of the clasp tip.

17. Factors Governing the Chance of a Retentive Clasp:

• Undercut depth.
• Location of the undercut.
• Retentive quality of the tooth surface.
• Flexibility of the clasp material.
• Design of the clasp.