MDS PREP
All of the following are true regarding the use of cast circumferential clasps, except that, the
1. retentive clasp terminal should originate occlusal to the height of contour
2. retentive terminal should always point towards the gingiva
3. clasp arm should be kept as low on the tooth as possible
4. all of the above
Prosthodontics
Answer: 2
In the design of cast circumferential clasps, the retentive terminal should ideally point away from the gingiva (toward the occlusal surface) to allow for proper engagement and retention without causing trauma to the gingival tissue.
Muscles involved in centric relation
1. Temporalis and masseter
2. Medial and lateral pterygoids
3. Temporalis and lateral pterygoid
4. None of the above
Prosthodontics
Answer: 1
Muscles involved in centric relation are temporalis and masseter.
Freeway space is defined as
1. Vertical dimension at rest - vertical dimension at occlusion
2. Vertical dimension of occlusion + vertical dimension at rest
3. Vertical dimension at rest
4. Vertical dimension at occlusion - vertical dimension at rest
Prosthodontics
Answer: 1
Freeway space is defined as vertical dimension at rest - vertical dimension at occlusion.
Which of the following is not true regarding the muscular influence on
denture borders
1. Masseter muscle may influence the borders and flange of the maxillary denture
2. Temporal muscle may influence the denture flange in the maxillary tuberosity
area
3. Medial pterygoid muscle may influence the denture border in the region of the
pterygomaxillary notch
4. None of the above
Prosthodontics
Answer: 3
Explanation: The medial pterygoid muscle primarily functions to move the
mandible medially and assist in closing the jaw. It does not directly influence
the borders of a maxillary denture in the region of the pterygomaxillary notch.
Instead, it is involved in the movement of the mandible and may indirectly
affect the fit and stability of the denture.
The purpose of boxing an impression is
1. Boxing pressure the border width after border molding
2. To serve as a base for cast poured
3. Both A and B
4. None of the above
Prosthodontics
Answer: 3
The purpose of boxing an impression is both to serve as a base for cast poured and to boxing pressure the border width after border molding.
When making peripheral seal for mandibular denture, patient notices that the impression is rising when the patient opens his mouth. It indicates
1. Overextension of the labial and lingual surfaces
2. Overextension of the labial and buccal surfaces
3. Overextension of the lingual surfaces
4. Underextension of the lingual surfaces
Prosthodontics
Answer: 2
When making peripheral seal for mandibular denture, if the impression is rising when the patient opens his mouth, it indicates overextension of the labial and buccal surfaces.
The primary advantage of implant supported prosthesis is
1. decreased bulk of the prosthesis
2. improved phonetics
3. maintenance of alveolar bone
4. improved proprioception
Prosthodontics
Answer: 3
Explanation: Implant-supported prostheses have the advantage of maintaining
alveolar bone due to osseointegration. This helps preserve the natural bone
structure and reduces the risk of bone resorption that is common with
traditional complete dentures, which can lead to changes in the patient's facial
profile over time.
What does the term "block out" refer to in the context of dental
surveying?
1) The removal of teeth
2) The elimination of undesirable undercut on the master cast
3) The process of cleaning the cast
4) The application of wax to the cast
Prosthodontics
Answer: 2
Block out is the process of eliminating
undesirable undercuts on the master cast before duplication, ensuring a better
fit for the prosthesis.