MDS PREP
The precision attachment which derives its retention from within the root, in
which a female sleeve is cemented in the root and the male portion is a nylon
post and ball head, is the
1. Zest anchor
2. Ackermann joint
3. Doder attachment
4. Quinlivan attachment
Prosthodontics
Answer: 1
Explanation: The Zest anchor is a type of precision attachment used in dental prosthetics that provides a secure connection between the prosthesis and the remaining tooth structure. It utilizes a female component cemented into the root and a male component that fits into it, allowing for a stable and retentive connection. The other options do not describe this specific mechanism.<br />
What is the purpose of using undercut gauges in dental surveying?
1) To identify the amount of retentive undercut
2) To measure the size of the cast
3) To contour wax patterns
4) To clean the surveyor
Prosthodontics
Answer: 1
Undercut gauges are specifically designed to measure the amount of retentive undercut available on the cast.
In making a final impression for a complete denture, the most important area of the impression is
1. Ridge area of maxilla and buccal shelf of mandible
2. Lingual border area of mandible
3. Junction of hard and soft palate of maxilla and distolingual area of mandible
4. Mid palatel area of maxilla and ridge of the mandible
Prosthodontics
Answer: 3
In making a final impression for a complete denture, the most important area of the impression is the junction of hard and soft palate of maxilla and distolingual area of mandible.
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.
Fovea palatine are situated in
1. Hard palate
2. Soft palate
3. At the junction of hard and soft palate
4. Their position is not fixed
Prosthodontics
Answer: 2
Fovea palatine are situated in the soft palate.
When recording jaw relations, the danger of displacing the baseplates can be
minimized by
1. fabricating wax occlusal rims
2. lining the baseplate with acrylic resin
3. fabricating compound occlusal rims
4. lining the baseplate with zinc oxide-eugenol impression paste
Prosthodontics
Answer: 4
Explanation: Lining the baseplate with zinc oxide-eugenol impression paste
provides a more stable and accurate fit during jaw relation records. This
material can help capture the contours of the underlying tissues and minimize
movement of the baseplate, thus reducing the risk of displacing it during the
recording process. The other options may not provide the same level of
stability.
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.
Indirect retainers are situated
1) As far anteriorly from the fulcrum line
2) As close to the fulcrum line
3) At the canine region
4) At the mesial marginal ridge of the premolars in the class I case
Prosthodontics
Answer: 1
Indirect retainers are components of removable partial dentures that help to prevent the denture from dislodging during function. They are ideally placed as far anteriorly from the fulcrum line (the line around which the denture rotates) as possible. This positioning helps to provide stability and support to the denture, counteracting the forces that could dislodge it.