MDS PREP
Identify the wrong statement regarding salivary scan
1. Specifity is less than sialograms
2. Salivary scan is functional whereas sialagram is anatomical
3. When both are indicated scan is done first
4. When both are indicated sialogram is done first
Prosthodontics
Answer: 4
Identify the wrong statement regarding salivary scan: When both are indicated, sialogram is done first.
The mean denture bearing area in the edentulous mandible is approximately
1) 12.25 cm square
2) 16.25 cm square
3) 18.12 cm square
4) 20.25 cm square
Prosthodontics
Answer: 1
The denture bearing area is the part of the jawbone that supports a denture. In an edentulous (toothless) mandible, this area is crucial for the stability and retention of the denture. The mean value of 12.25 cm square is a commonly cited average for the surface area required for a well-fitting and functional lower denture. This area is important for distributing masticatory forces and providing sufficient space for denture construction.
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 primary function of the compensating curve, incorporated in complete
dentures, is to provide
1 stability in centric relation
2. balanced occlusion during lateral movements of the mandible
3 an esthetically pleasing denture
4. balancing occlusal contacts during protrusive movements
Prosthodontics
Answer: 4
Explanation: The compensating curve is designed to ensure
that occlusal contacts are balanced during protrusive movements, which is
essential for maintaining stability and function of the complete denture. This
curve helps to distribute occlusal forces evenly and prevents tipping or
dislodgment of the denture during functional movements. The other options do not
accurately reflect the primary purpose of the compensating curve.
The following aslo serves in guiding path of insertion and path of removal along with guiding planes
1) Minor connector
2) Occlusal rest
3) Major connector
4) Clasps
Prosthodontics
Answer: 1
While guiding planes are the primary elements that dictate the path of insertion and removal, the minor connector also plays a role. The minor connector helps in the overall stability and retention of the RPD by linking the major connector to the abutment tooth and distributing the forces more evenly across the denture base. However, its primary function is not to guide the path of insertion and removal as much as it is to provide additional support and strength to the RPD.
Which of the following is true regarding clasp retention?
1. Cast gold clasps cannot engage greater depth of undercuts than cast
cobalt-chromium alloy clasps of equal dimensions
2. It does not depend on the material from which it is fabricated
3. A wrought clasp requires greater under cut than a cast clasp
4. A cast clasp requires greater undercut than a wrought wire clasp
Prosthodontics Answer: 3
Explanation: Wrought wire clasps are more flexible than cast clasps, allowing them to engage undercuts more effectively. However, they require a greater depth of undercut to achieve the same retention as cast clasps. This is because wrought wire clasps can flex and adapt to the contours of the tooth better than rigid cast clasps. The other statements are incorrect regarding the comparative abilities of clasp materials and their engagement with undercuts.
What is the significance of the path of insertion in removable
partial dentures?
1) It is the path followed by the denture from first contact until fully
seated
2) It indicates the direction of tooth extraction
3) It determines the color of the denture
4) It measures the size of the denture
Prosthodontics
Answer: 1
The path of insertion is crucial as it describes the trajectory the denture takes during placement, which is essential for ensuring proper fit and function.
Postdam area serves mainly to
1. Prevent ingress of food and saliva beneath denture base
2. Preventing lifting away of denture during incising
3. Stabilize the denture
4. Both A and B
Prosthodontics
Answer: 4
Postdam area serves mainly to prevent ingress of food and saliva beneath the denture base.