MDS PREP
To make an impression of hyperplastic tissue, one should
1. Use wax for impression
2. Use elastomeric impressions to displace the tissue
3. Ensure intimate contact of the impression material with the tissue
4. Use specially fitted tray
Prosthodontics
Answer: 3
To make an impression of hyperplastic tissue, one should ensure intimate contact of the impression material with the tissue.
The first step in surveying the casts for RPD is
1) Establishment of guiding planes
2) Establishment of undercuts for retention
3) Establishment of tooth contour for aesthetics
4) None of the above
Prosthodontics
Answer: 1
The initial step in surveying casts for an RPD is the establishment of guiding planes. These planes are essential for determining the path of insertion and removal of the denture, which in turn affects the overall stability and function of the prosthesis. Once the guiding planes are established, other steps such as identifying undercuts for retention and aesthetic considerations can be addressed.
If a complete denture patient has genial tubercle at the level of the crest of mandibular ridge, the denture base
1. Can cover them
2. Should not cover them
3. Should cover them but relief is not necessary
4. Should cover them and relief is must
Prosthodontics
Answer: 4
If a complete denture patient has genial tubercle at the level of the crest of the mandibular ridge, the denture base should cover them and relief is a must.
The range of motion, as measured in millimeters, is least for the
1. pure hinge like opening and closing movement
2. protrusive movement
3. left lateral movement
4. Bennet movement
Prosthodontics
Answer: 4
Explanation:
Pure hinge-like opening and closing movement: The range of pure rotation in
the temporomandibular joint (TMJ) was determined to be up to 15–20 mm in the
1960s. However, recent research suggests that pure rotational movement may not
occur.
Protrusive movement: The normal range of motion for protrusive movement is
8–12 mm.
Left lateral movement: The normal range of motion for left lateral movement
is 8–12 mm. The normal range of motion for mouth opening is 35–60 mm.
The average immediate Bennett shift was found to be 1.05 mm on the left
side and 1.12 mm on the right side when firm guidance was used.
Which of the following is true regarding immediate complete dentures?
1. Dentures should be relined or remade in 6-12 months
2. The patient should not wear the dentures for the first 24 hours after
extraction
3. Anterior try in should be done
4. Teeth should always be placed in the same position as natural teeth
Prosthodontics
Answer: 1
Explanation: Immediate complete dentures often require relining or remaking due
to the significant bone and tissue changes that occur during the initial healing
phase after tooth extraction. The reline helps to adapt the denture to the new
contours of the alveolar ridge, providing a more stable and comfortable fit.
Abutment teeth in bilateral distal extension RPD should have all of the following except
1) Retention buccally on one side and lingually on the other side
2) Buccal and lingual retention bilaterally
3) Guiding planes parallel
4) Non-interfering occlusal rests
Prosthodontics
Answer: 1
In a bilateral distal extension RPD, abutment teeth are crucial for the stability and support of the prosthesis. However, it is not ideal to have retention buccally on one side and lingually on the other side as this can lead to tipping and rotation of the denture during function, compromising its stability. Instead, both buccal and lingual retention is preferred for a more balanced and predictable outcome.
Guiding planes
1) Determine the path of insertion
2) Determine the path of removal
3) Assure predicatable clasp design
4) All of the above
Prosthodontics
Answer: 4
Guiding planes are flat, polished surfaces on the abutment teeth that guide the RPD into place. They are crucial for the predictable placement of retentive elements such as clasps and for ensuring that the forces are transmitted along the long axis of the teeth, minimizing horizontal movements. Additionally, they help in the overall stability and function of the denture.
When there is a prematurity in centric occlusion but not in eccentric or other movements, then reduce
1) Cusps of opposing teeth
2) Mesiodistal position of teeth
3) Opposing fossa or marginal ridge
4) None of the above
Prosthodontics
Answer: 3
Explanation:In cases where there is a premature contact in centric occlusion, it is often necessary to adjust the opposing fossa or marginal ridge to achieve a more harmonious occlusion. This adjustment helps to eliminate the premature contact and allows for proper occlusal function.