Removable Prosthodontics Assistance Practice Questions
20 free Removable Prosthodontics Assistance practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which impression material is most commonly used for preliminary impressions in removable prosthodontics?
- A Polyether
- B Alginate
- C Polyvinyl siloxane
- D ZOE paste
Correct answer: Alginate
Alginate is inexpensive, easy to mix, and captures adequate detail for preliminary models. It is the most common choice for initial denture impressions.
What is the purpose of border molding during a complete denture impression?
- A To select and arrange prosthetic teeth
- B To record functional muscle movements
- C To verify centric occlusion and jaw relations
- D To disinfect the custom tray
Correct answer: To record functional muscle movements
Border molding shapes the edges of the impression to reflect functional movements. This improves retention and fit of the final denture.
Which step ensures correct vertical dimension in complete denture fabrication?
- A Facebow record
- B Wax rim try-in
- C Final impression
- D Delivery appointment
Correct answer: Wax rim try-in
Wax rims are used to establish vertical dimension and occlusal relationship. This is a critical step before tooth setup.
What is the purpose of a custom impression tray in removable prosthodontics?
- A To increase retention of the denture
- B To achieve accurate final impressions
- C To adjust bite forces
- D To add reinforcement to the denture base
Correct answer: To achieve accurate final impressions
Custom trays are made to closely adapt to the patient’s anatomy, reducing impression material thickness and improving accuracy.
Which area is considered a primary support region for a mandibular denture?
- A Buccal frenum
- B Retromolar pad
- C Mylohyoid ridge
- D Lingual frenum
Correct answer: Retromolar pad
The retromolar pad provides stability and support for mandibular dentures. It is resistant to bone resorption.
Which major connector is most common in maxillary removable partial dentures?
- A Lingual bar
- B Lingual plate
- C Palatal strap
- D U-shaped connector
Correct answer: Palatal strap
Palatal straps offer strong support and rigidity. They are commonly used due to their minimal bulk and patient comfort.
Which instrument is used to check pressure spots on newly delivered dentures?
- A Articulating paper and marking ribbon
- B Pressure indicating paste
- C Curing light device
- D Ultrasonic scaling unit
Correct answer: Pressure indicating paste
Pressure indicating paste highlights high-pressure areas needing adjustment. It helps achieve patient comfort and proper fit.
What should the assistant provide when a patient reports soreness from a new denture?
- A Immediate denture replacement
- B Prescription pain medication
- C An adjustment visit and continued wear
- D Advice to remove the denture and rest the oral tissues
Correct answer: An adjustment visit and continued wear
Wearing the denture helps identify problem areas for adjustment. Stopping use often makes adaptation more difficult.
Which component provides retention for removable partial dentures?
- A Major connector
- B Minor connector
- C Rests
- D Clasps
Correct answer: Clasps
Clasps engage undercuts on teeth to provide mechanical retention. They help stabilize and secure the prosthesis.
Why are tissue conditioners used in denture patients?
- A To whiten and polish the denture acrylic
- B To help patients chew harder and tougher foods
- C To treat inflamed tissues and reline dentures
- D To reduce overall denture weight
Correct answer: To treat inflamed tissues and reline dentures
Tissue conditioners are soft liners that allow tissues to heal. They improve comfort and fit temporarily.
Which appointment involves verifying esthetics, phonetics, and occlusion before final denture processing?
- A Delivery appointment
- B Wax try-in
- C Preliminary impression
- D Post-insertion check
Correct answer: Wax try-in
The wax try-in allows evaluation of tooth arrangement and occlusion. Adjustments are made before final denture fabrication.
Which factor most affects denture retention?
- A Color of acrylic
- B Saliva viscosity
- C Number of missing teeth
- D Shade of denture teeth
Correct answer: Saliva viscosity
Saliva acts as a seal between the denture base and mucosa. Thin, watery saliva can reduce retention.
A patient reports their lower denture is lifting when they speak. Which area likely needs adjustment?
- A Buccal flange
- B Lingual flange
- C Central fossa
- D Incisal edge
Correct answer: Lingual flange
Lingual flange overextension can cause denture lifting during speech. Adjusting this area improves stability.
Which impression is required to capture the movable tissues for a functional lower denture?
- A Preliminary impression
- B Standard alginate impression without border molding
- C Final impression with border molding
- D Wax bite registration
Correct answer: Final impression with border molding
Final impressions with border molding capture movement of soft tissues. This ensures proper fit and stability.
What is the purpose of rests in partial dentures?
- A Retention of the prosthesis on abutments
- B Support against tissueward movement
- C Improvement of speech and phonetics
- D Shade matching and esthetic evaluation
Correct answer: Support against tissueward movement
Rests distribute occlusal forces and prevent the prosthesis from sinking into the soft tissues. They help maintain stability.
What should the assistant do before sending a denture to the lab for repair?
- A Rinse and disinfect the denture
- B Place it in warm water only
- C Wrap it dry in paper towels
- D Store it overnight without cleaning
Correct answer: Rinse and disinfect the denture
Dentures must be disinfected to protect lab personnel. Proper cleaning prevents cross-contamination.
Which denture material is used to create the denture base?
- A Glass ionomer
- B Acrylic resin
- C Zinc oxide eugenol
- D Porcelain
Correct answer: Acrylic resin
Acrylic resin is strong, lightweight, and easily molded. It is the most common denture base material.
Why is a facebow used during denture fabrication?
- A To record and select the correct tooth shade
- B To determine the correct vertical dimension of occlusion
- C To transfer maxillary position to the articulator
- D To shape and contour the denture flange
Correct answer: To transfer maxillary position to the articulator
A facebow transfers spatial orientation of the maxilla to an articulator. It improves accuracy of occlusal relationships.
What should denture patients be instructed to do at night?
- A Wear dentures continuously throughout the night
- B Remove dentures and soak in water
- C Brush dentures with toothpaste
- D Wrap dentures in a dry cloth
Correct answer: Remove dentures and soak in water
Removing dentures allows tissues to rest and prevents fungal infections. Storing in water prevents acrylic from drying out and warping.
Which complication is common when a new denture lacks proper occlusion?
- A Increased retention and improved stability
- B Improved phonetics and speech clarity
- C Sore spots and tissue irritation
- D Less saliva production
Correct answer: Sore spots and tissue irritation
Improper occlusion leads to uneven pressure points, causing soreness. Adjustments are required to restore comfort.