MDS PREP
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.
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.
Which of the following is painless
1. Vit-C deficiency gingivitis
2. Desquamative gingivitis
3. Pregnancy tumour
4. Gingival abscess
Prosthodontics
Answer: 3
Which of the following is painless: pregnancy tumour.
In a complete denture, the position of the mandibular first premolar is
determined by the
1. mental foramen
2. adjacent second premolar
3. termination of the mylohyoid ridge
4. mandibular canine
Prosthodontics
Answer: 4
Explanation: In the arrangement of teeth in a complete denture, the
mandibular first premolar is typically positioned with its mesial aspect in
contact with the lateral aspect of the mandibular canine. This is part of the
denture setup to ensure proper occlusal relationships and aesthetics.
In the sequencing of a treatment plan for a conventional immediate complete
denture, the dentures are fabricated
1. before any teeth are extracted
2. immediately after the extraction of all posterior teeth
3. 6-8 weeks after the extraction of posterior teeth
4. after extraction of all the teeth
Prosthodontics
Answer: 4
Explanation: Immediate complete dentures are fabricated after the extraction
of all the teeth. They are inserted into the patient's mouth immediately after
the extraction to provide immediate tooth replacement and allow for healing
without a gap in the patient's smile.
The effect of saliva on the denture prognosis
1. No effect
2. Affects denture retention
3. Tissue conditioners are indicated when there is reduction in salivary flow
4. None of the above
Prosthodontics
Answer: 2
The effect of saliva on denture prognosis affects denture retention.
Indirect retainers are situated
1) As far anteriorly from the fulcrum line
2) As close to the fulcrum line
3) At the canine region
4) At the mesial marginal ridge of the premolars in the class I case
Prosthodontics
Answer: 1
Indirect retainers are components of removable partial dentures that help to prevent the denture from dislodging during function. They are ideally placed as far anteriorly from the fulcrum line (the line around which the denture rotates) as possible. This positioning helps to provide stability and support to the denture, counteracting the forces that could dislodge it.
Which class of RPD is characterized by the absence of an axis of rotation?
1) Class I
2) Class II
3) Class III
4) Class IV
Prosthodontics Answer: 3
Class III RPDs do not have a significant axis of rotation due to their design, which allows for better load distribution across the remaining teeth compared to Class I and II RPDs.