MDS PREP
What is the function of the analyzing rod in a dental surveyor?
1) To clean the cast
2) To contour wax patterns
3) To measure the depth of cavities
4) To analyze the cast for undercuts
Prosthodontics
Answer: 4
The analyzing rod is a straight metal shaft used
to evaluate the presence or absence of undercuts on the cast.
The appropriate shape of a rest for a canine tooth is:
1) Full moon shaped
2) Half moon shaped
3) Half pear-shaped
4) None of the above
Prosthodontics Answer: 2
The half moon shape is ideal for canine rests as it provides adequate support and stability for the removable partial denture.
Porosity occuring in the bulky portions of the heat-cured acrylic complete dentures is due to
1) Insufficient pressure application during packing
2) Time lag between packing and curing
3) Directly placing the packed resin in water at 100 degree
4) Using a fluid pour technique
Prosthodontics
Answer: 3
Porosity in heat-cured acrylic dentures can occur due to several factors, but the most significant cause in this context is the direct placement of the packed resin in water at high temperatures (100 degrees Celsius). When the packed resin is subjected to such conditions, it can lead to rapid polymerization and the formation of bubbles or voids within the material, resulting in porosity. This is because the heat causes the monomer to vaporize, and if the vapor cannot escape, it leads to trapped air pockets.
The distal palatal termination of the complete denture is dictated by the
1. Tuberosity
2. Vibrating line
3. Fovea palatine
4. Maxillary tori
Prosthodontics
Answer: 2
The distal palatal termination of the complete denture is dictated by the vibrating line.
Forces acting on the abutment tooth in an FPD can be effectively minimised by
1) Directing the forces perpendicular to long axis of the crown
2) Directing the forces along the long axis of the crown
3) Both of the above
4) None of the above
Prosthodontics
Answer: 2
Directing forces along the long axis of the crown is an effective way to minimize the stresses on an abutment tooth in a fixed partial denture (FPD). This allows the tooth to function more naturally and reduces the likelihood of complications such as root fracture or periodontal damage
The main purpose of boxing an impression is
1. To serve as a base for cast poured
2. To preserve the border width after border moulding
3. To prevent distortion of the impression
4. All of the above
Prosthodontics
Answer: 2
The main purpose of boxing an impression is to preserve the border width after border molding.
Primary stress bearing area in maxillary complete denture is
1. Anterior palate
2. Buccal sulcus areas
3. Edentulous ridges
4. Posterior palatal area
Prosthodontics
Answer: 3
The primary stress-bearing area in maxillary complete denture is the edentulous ridges.
Lingual flange in the molar region is determined by the
1. Mylohyoid
2. Genioglossus
3. Digastric
4. Superior constrictor
Prosthodontics
Answer: 1
Lingual flange in the molar region is determined by the mylohyoid.