MDS PREP
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.
In a denture wearing patient, there is
1. No bone resorption
2. Bone formation
3. Independent of denture, there is bone resorption
4. Initial bone resorption followed by bone formation
Prosthodontics
Answer: 3
In a denture wearing patient, there is independent of the denture, there is bone resorption.
The posterior palatel seal for a maxillary complete denture
1. Is placed immediately posterior to the vibrating line
2. Is placed immediately anterior to the vibrating line
3. Is not necessary if a metal base is made
4. Will vary in outline and depth according to the palatal form
Prosthodontics
Answer: 4
The posterior palatal seal for a maxillary complete denture will vary in outline and depth according to the palatal form.
A maxillary alginate impression is removed with a quick jerk to prevent
1. Syneresis
2. Permanent deformation
3. Elastic deformation
4. Surface details
Prosthodontics
Answer: 2
A maxillary alginate impression is removed with a quick jerk to prevent permanent deformation.
According to Monson’s spheric theory of occlusion, each cusp and incisal edge
conforms to a segment of the sphere, 8 inches in diameter, with its center at
the
1. sella
2. lambda
3. glabella
4. bregma
Prosthodontics
Answer: 3
Explanation: Monson's spheric theory of occlusion suggests that all cusps and
incisal edges of the teeth should conform to a sphere with an 8-inch diameter,
with the center of the sphere at the glabella, which is the most anterior and
superior point on the midline of the frontal bone of the skull. This concept is
used to achieve balanced occlusion in complete dentures.
"Guiding planes" relate to
1) Path of insertion
2) Means of retention
3) Extent of undercuts
4) Tilt of abutment teeth
Prosthodontics
Answer: 1
guiding planes are flat, polished surfaces on the abutment teeth that guide the RPD along a specific path during insertion and removal. They are located adjacent to the edentulous area and are crucial for the proper seating and function of the denture.
A properly designed rest on lingual surface of a canine is preferred to a rest on incisal surface because
1) Less leverage is exerted against the tooth by lingual rest
2) Enamel is thicker on lingual surface
3) Visibility and access is better on lingual surface
4) None of the above
Prosthodontics
Answer: 1
a properly designed rest on the lingual surface of a canine is preferred because it exerts less leverage against the tooth compared to a rest on the incisal surface (option 1). This is important for maintaining the integrity of the tooth and preventing potential damage or displacement.
Articulators are classified into arbitrary positional and functional by
1. Beak
2. Posell
3. Boucher
4. Thomas
Prosthodontics Answer: 3
Articulators are classified into arbitrary positional and functional by Boucher.
Arbitrary positional articulators hold the mandible in a pre-determined, fixed position that does not necessarily represent the patient's true centric relation or functional movements.
Functional articulators, on the other hand, aim to simulate the patient's individual centric relation and dynamic movements of the mandible, allowing for a more accurate representation of the patient's actual occlusion. Boucher's classification system is based on the type of articulation and the way it records and transfers the patient's jaw movements to the dental casts.