MDS PREP
Which of the following is least likely to occur when record bases are formed
from self-curing resins, on the master
cast of an edentulous patient without blocking out the undercuts ?
1 The borders will not be accurately reproduced
2 Record bases will exhibit instability in the patients mouth
3 The casts may be abraded when removing the record bases
4 Record bases may break when removing from the casts
Prosthodontics
Answer: 1
Explanation: When record bases are formed from self-curing
resins without blocking out undercuts, the most likely issues are instability in
the mouth, abrasion of the casts, and potential breakage of the record bases
upon removal. However, the borders of the record bases are typically
well-defined and can be accurately reproduced even if undercuts are not blocked
out. Therefore, option 1 is the least likely occurrence.
When drilling cylindrical implant sites in bone, which the following is false?
1. Copious irrigation should be used with the drill
2. The drill should not rotate more than 5 secs continuously in contact with bone
3. Only speeds above 20,000 rpm should be used in drilling
4. Enough pressure should be used to proceed 0.5-1mm every 5 seconds
Prosthodontics
Answer: 3
When drilling cylindrical implant sites in bone, the following is false: only speeds above 20,000 rpm should be used in drilling.
Centric relation is best defined as
1. The relation of the mandible to the maxillary when the teeth are in centric occlusion
2. The retruded contact position (RC)
3. The relation of the mandible to the maxilla when the condyles are in their most posterior position in the glenoid fossae
4. None of the above
Prosthodontics
Answer: 3
Centric relation is best defined as the relation of the mandible to the maxilla when the condyles are in their most posterior position in the glenoid fossae.
Of the three dimensions of colour, the one which describes the dominant colour of the object is
1. Hue
2. Value
3. Chroma
4. Maverick
Prosthodontics
Answer: 1
Hue refers to the attribute of a color that allows it to be classified as red, blue, green, etc. It is one of the three dimensions of color, along with value (lightness) and chroma (intensity or saturation).
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.
Because of the great length of this clasp it must be designed with additional sup port, usually in the form of an auxiliary bracing arm. Which clasp is this?
1. Ring clasp
2, Combination clasp
3. Fish hook clasp
4. Multiple circlet clasp
Prosthodontics
Answer: 1
A ring clasp is a type of clasp used in removable partial dentures that encircles the abutment tooth. Due to its length and the potential for movement, it often requires additional support, typically provided by an auxiliary bracing arm, to ensure stability and retention of the prosthesis. This design helps distribute forces more evenly and prevents dislodgment during function.
Mention the blood supply to the flap that has been used to close an oro antral fistula in the area of tooth
1. Nasopalatine
2. Greater palatine
3. Posterior superior alveolar
4. Facial
The blood supply to the flap that has been used to close an oroantral fistula in the area of tooth is greater palatine.
Recontouring and selective grinding procedures are carried out in complete denture to
1) Decrease the vertical dimension of occlusion
2) Decrease cuspal height
3) Enhance curve of Spee
4) Remove occlusal disharmony
Prosthodontics
Answer: 4
Recontouring and selective grinding are procedures used to adjust the fit and function of complete dentures. These adjustments are often performed to eliminate any interference with the patient's normal masticatory (chewing) function or to correct any imbalances in the bite. By removing excess material and reshaping the occlusal surfaces, the dentist can address issues such as malocclusion or improper contact between teeth, thereby restoring a harmonious occlusion.