Removable Denture Assisting Practice Questions
20 free Removable Denture Assisting practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What distinguishes a removable denture from a fixed prosthesis?
- A It is permanently cemented to remaining teeth or implants
- B It can be removed and reinserted by the patient
- C It always uses metal-ceramic crowns
- D It does not replace missing teeth
Correct answer: It can be removed and reinserted by the patient
Removable dentures by definition are designed to be taken out and reinserted by the patient for cleaning and maintenance, unlike fixed prostheses which are permanently attached.
Which type of removable denture is indicated when all teeth in an arch are missing?
- A Partial denture
- B Overdenture
- C Complete (full) denture
- D Fixed bridge
Correct answer: Complete (full) denture
A complete (full) denture replaces an entire arch when all teeth are missing in that arch.
In a removable partial denture (RPD), what is the primary purpose of a clasp or retainer?
- A To improve denture aesthetics only
- B To anchor the denture to remaining natural teeth for retention and stability
- C To bond the denture base permanently to teeth
- D To serve as a major connector
Correct answer: To anchor the denture to remaining natural teeth for retention and stability
Clasps or direct retainers in an RPD engage remaining natural teeth to secure the denture in place, aiding retention and stability.
Which component of a removable partial denture connects the right and left sides of the prosthesis and supports other elements such as clasps and rests?
- A Minor connector
- B Denture base
- C Major connector
- D Artificial teeth
Correct answer: Major connector
The major connector is the structural element that links all parts of a removable partial denture, providing rigidity and distributing forces across the arch.
What is the purpose of taking a functional impression (as opposed to a preliminary alginate impression) when fabricating a removable denture?
- A To capture only the teeth positions
- B To record soft tissue under functional load for accurate denture base adaptation
- C To directly cure the acrylic denture base
- D To eliminate need for occlusal bite registration
Correct answer: To record soft tissue under functional load for accurate denture base adaptation
A functional impression records the mucosa under functional stresses (cheek, tongue, ridge compression) to ensure that the denture base fits correctly under actual conditions, improving comfort and load distribution.
Which design principle helps distribute occlusal forces in a removable partial denture, especially in distal-extension (free-end) cases?
- A Using only acrylic base without metal framework
- B Ensuring minimal tissue coverage under the base
- C Incorporating indirect retainers and broad denture base extensions
- D Avoiding any clasps
Correct answer: Incorporating indirect retainers and broad denture base extensions
For distal-extension RPDs, indirect retainers combined with an adequately extended denture base help distribute occlusal forces and reduce leverage on abutment teeth.
What is a common material used for the base of removable dentures, especially complete dentures?
- A Porcelain
- B Heat-cured acrylic resin
- C Gold alloy
- D Composite resin
Correct answer: Heat-cured acrylic resin
Heat-cured acrylic resin is widely used for denture bases because it can be shaped to fit soft tissues, is lightweight, and relatively easy to process.
Why are surveyor analyses of study casts important in removable partial denture planning?
- A To decide the shade of artificial teeth
- B To determine undercuts, guide planes, and optimal clasp placement for retention
- C To test the patient's bite strength
- D To measure the height of the palate
Correct answer: To determine undercuts, guide planes, and optimal clasp placement for retention
Surveying helps map tooth undercuts, guiding planes, and paths of insertion — essential for designing an RPD with stable retention and proper clasp placement.
Which classification is used to describe patterns of partially edentulous arches for removable partial dentures?
- A Angle classification
- B Kennedy classification
- C G.V. Black classification
- D ADA cavity classification
Correct answer: Kennedy classification
The Kennedy classification describes partially edentulous arches (e.g., bilateral free-end, unilateral free-end, bounded, and anterior spans) and is fundamental in removable partial denture treatment planning.
What is the main disadvantage of a mucosa-borne removable denture compared to a tooth-borne denture?
- A Distributes force more evenly across abutments
- B Greater bone resorption under the ridge
- C Provides markedly stronger mechanical retention
- D Eliminates the need for retentive clasps
Correct answer: Greater bone resorption under the ridge
Mucosa-borne dentures transmit masticatory forces onto the residual ridge mucosa and underlying bone — over time this can accelerate bone resorption compared to tooth-borne support.
What is the role of occlusal rests in removable partial dentures?
- A To attach the metal framework to the acrylic denture base
- B To give vertical support along the abutment's long axis
- C To enhance the overall aesthetics of the denture
- D To retain the denture entirely without any clasps
Correct answer: To give vertical support along the abutment's long axis
Occlusal rests support the RPD vertically and ensure occlusal forces are directed along the long axis of the abutment teeth, reducing stress and preventing harmful torquing.
When constructing a complete denture for a fully edentulous arch, what is used to record the relationship between jaws?
- A A decorative diagnostic wax-up pattern
- B Occlusion rims (wax rims)
- C A permanent full-coverage crown
- D A cemented fixed dental bridge
Correct answer: Occlusion rims (wax rims)
Occlusion rims (wax rims) are used to record maxillomandibular relationships (vertical and centric relation) before fabricating the final denture.
Which of the following is an advantage of using a removable denture over a fixed prosthesis in some patients?
- A Never requires any periodic adjustment
- B Easier to clean and modify if further teeth are lost
- C Better chewing efficiency than natural dentition
- D No clinical appointments needed after initial delivery
Correct answer: Easier to clean and modify if further teeth are lost
Removable dentures can be taken out for cleaning, and they can be modified or replaced more easily if the patient’s dental situation changes (e.g., further tooth loss), offering flexibility.
What is one reason a clinician might process a denture in a laboratory flask rather than chair-side fabrication?
- A To permit use of a metal cast framework only
- B Controlled polymerization gives better fit
- C To eliminate the need for taking any impressions
- D To make the denture permanent and non-removable
Correct answer: Controlled polymerization gives better fit
Laboratory processing in a flask allows for controlled pressure and polymerization of acrylic resin, producing a denture base with better strength and adaptation than quick chair-side methods.
Which type of clasp is considered a suprabulge clasp commonly used in tooth-borne removable partial dentures?
- A I-bar clasp
- B Akers’ clasp (circumferential clasp)
- C Precision attachment
- D Lingual plate
Correct answer: Akers’ clasp (circumferential clasp)
The Akers' clasp (circumferential clasp) is a suprabulge direct retainer that approaches the undercut from above the height of contour and is widely used in tooth-borne partial dentures.
Which of the following is an indication for a removable partial denture instead of a fixed bridge?
- A All posterior teeth are present and fully healthy
- B A distal free-end area lacking abutments
- C A patient's need for a permanent fixed restoration
- D A patient's strong desire to avoid visible clasps
Correct answer: A distal free-end area lacking abutments
When there is a free-end edentulous area lacking posterior abutments, a removable partial denture is indicated because a fixed bridge cannot be supported; RPD provides a feasible solution.
What must be considered when selecting artificial teeth for a removable denture to ensure good long-term function?
- A Only the shade of the artificial teeth
- B The overall shape of each individual artificial tooth
- C Occlusal scheme, ridge relation, ridge anatomy
- D That the teeth are made of durable metal
Correct answer: Occlusal scheme, ridge relation, ridge anatomy
Appropriate selection of artificial teeth must consider occlusal scheme, residual ridge anatomy, and jaw relation to ensure proper function, stability, and comfort of denture.
Which prosthesis type involves covering one or more remaining roots or implants and is still removable by the patient?
- A Fixed bridge
- B Complete overdenture
- C Removable overdenture
- D Fixed partial denture
Correct answer: Removable overdenture
A removable overdenture covers retained roots or implants and remains removable by the patient, providing added retention and preserving bone structure compared to conventional dentures.
Why is periodic relining of a removable denture sometimes necessary after delivery?
- A To change the colour of the acrylic denture base
- B Because the acrylic teeth wear down very quickly
- C To re-adapt the base to the changed ridge
- D To convert a partial denture into a complete one
Correct answer: To re-adapt the base to the changed ridge
Over time, alveolar ridge resorption or tissue changes can lead to poor denture fit; relining re-adapts the base to the current tissue contours, improving retention and comfort.
During the fabrication of a removable partial denture, what is the purpose of the ‘surveying’ step on the study cast before framework design?
- A To wax the artificial teeth into their final place
- B To adjust the occlusion directly on the mounted study cast
- C To identify undercuts, insertion path and clasp design
- D To carry out polymerization of the acrylic base
Correct answer: To identify undercuts, insertion path and clasp design
Surveying helps in mapping undercuts, determining path of insertion, and planning clasp and rest placement — critical for proper design and retention of the RPD.