MDS PREP
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.
Guiding planes on abutment teeth provide
1) Predictable clasp retention
2) Increased resistance towards horizontal movement
3) Transmit forces along long axis of tooth
4) Guides the key into the key way
Prosthodontics
Answer: 1
The main function of guiding planes is to provide a stable and predictable path for the RPD to follow during insertion and removal. This helps in achieving proper clasp retention, which is essential for the stability of the denture. While they also contribute to resistance towards horizontal movement and guiding the key into the key way, their primary purpose is to ensure clasp retention.
When patient closes in centric occlusion if lower jaw is placed anteriorly in relation to upper jaw, it is called as
1. Normal occlusion
2. Centric occlusion
3. Pre normal occlusion
4. Centric relation
Prosthodontics
Answer: 3
When a patient closes in centric occlusion, if the lower jaw is placed anteriorly in relation to the upper jaw, it is called pre-normal occlusion.
A single bilateral edentulous area located anterior to the remaining natural teeth is classified as Kennedy-Apple- gate
1. Class I
2. Class II
3. Class III
4. Class IV
Prosthodontics
Answer: 4
Kennedy Class IV is characterized by a single
edentulous area that crosses the midline and is located anterior to the
remaining natural teeth. It is the only class that is purely anterior.
The following property of saliva affects denture retention
1. Quality and quantity of serous and mucus saliva
2. Quantity of mixed saliva
3. Quantity of only serous saliva
4. Both A and C
The property of saliva that affects denture retention is both quality and quantity of serous and mucus saliva.
Which of the following is NOT a component of a dental surveyor?
1) Base
2) Vertical arm
3) Toothbrush holder
4) Surveying arm
Prosthodontics
Answer: 3
A dental surveyor consists of components like a base, vertical arm, horizontal arm, and surveying arm, but it does not include a toothbrush holder.
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.
Only pure hinge movements of the mandible occur at
1. Centric occlusion
2. Centric relation
3. Lateral occlusion
4. Terminal hinge position
Prosthodontics
Answer: 4
Only pure hinge movements of the mandible occur at terminal hinge position.