MDS PREP
In which of the following situations the alveolar ridge resorption is least
1. Anterior mandibular area with overdentures on canines
2. Anterior mandibular area with class IV lower RPD opposing the upper CD
3. Anterior maxillary area when upper CD versus a lower CD
4. None of the above
Prosthodontics
Answer: 1
In which of the following situations the alveolar ridge resorption is least: anterior mandibular area with overdentures on canines.
Relining of complete dentures is recommended for the correction of
I major speech problems
2 poor esthetics
3. unsatisfactory jaw relationship
4 none of the above
Prosthodontics
Answer: 4
Explanation: Relining is primarily indicated when the fit of
the denture has changed due to resorption of the alveolar ridge or other
factors, leading to an unsatisfactory jaw relationship. However, it is not
typically used to address speech problems or esthetic concerns directly.
Therefore, the correct answer is that relining is not recommended for the
options listed.
Decreased vertical dimension of occlusion (increased interocclusal space) results in all of the following except
1. Loss of muscle power
2. Sagging of the corners of the mouth
3. Senile appearance
4. Increase in the masticatory efficiency
Prosthodontics
Answer: 4
Decreased vertical dimension of occlusion results in all of the following except an increase in masticatory efficiency.
"Guiding planes" relate to
1) Path of insertion
2) Means of retention
3) Extent of undercuts
4) Tilt of abutment teeth
Prosthodontics
Answer: 1
guiding planes are flat, polished surfaces on the abutment teeth that guide the RPD along a specific path during insertion and removal. They are located adjacent to the edentulous area and are crucial for the proper seating and function of the denture.
The thickness of the spacer used in spicial tray is
1. 2.5 mm
2. 2.0 mm
3. 1.5 mm
4. 1.0 mm
Prosthodontics
Answer: 2
The thickness of the spacer used in a special tray is 2.0 mm.
The primary disadvantage of polyurethane resilient liners is that they
1. require special processing equipment
2. tear very easily
3. are not sufficiently soft
4. are difficult to clean
Prosthodontics
Answer: 1
Explanation: Polyurethane resilient liners do require special processing
equipment for their fabrication. This can be a disadvantage in comparison to
other types of liners that may be easier to produce and handle in a typical
dental setting.
Excessive vertical dimension (decreased interocclusal distance) results in
1. Improper retention of the denture
2. Senile appearance of face
3. Sagging of the corners of the mouth
4. Trauma to the residual ridges
Prosthodontics
Answer: 4
Excessive vertical dimension (decreased interocclusal distance) results in trauma to the residual ridges.
Distal end of the complete denture should be
1. On the vibrating line
2. 1-2 mm posterior to vibrating line
3. 1-2 mm anterior to the vibrating line
4. Should be always on the hard palate
Prosthodontics
Answer: 2
The distal end of the complete denture should be 1-2 mm posterior to the vibrating line.