MDS PREP
For long span distal extension bases where rigidity is critical the major connector of choice is
1) Palatal strap
2) Anteroposterior palatal bar
3) Closed horse-shoe
4) Horse-shoe
Prosthodontics
Answer: 3
A closed horse-shoe major connector provides increased rigidity and support for
long-span distal extension bases in removable partial dentures. It helps
distribute forces evenly and enhances the stability of the prosthesis.
Broad palatel seal indicates
1. Type A palatal form
2. Type B palatal form
3. Type C palatal form
4. None of the above
Prosthodontics
Answer: 1
Broad palatal seal indicates type A palatal form.
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.
What does the term "height of contour" refer to in dental
surveying?
1) The lowest point of a tooth
2) The greatest circumference of a tooth at a selected axial position
3) The average height of all teeth
4) The position of the gum line
Prosthodontics
Answer: 2
The height of contour is defined as the line encircling a tooth that designates its greatest circumference at a specific axial position.
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.
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.
Main advantage of RPD over fixed bridge in replacing bilateral lost teeth
1) Cross arch stabilisation
2) Aesthetics
3) Less expensive
4) Comfort of the patient
Prosthodontics
Answer: 1
Cross Arch Stabilization: RPDs provide cross arch stabilization by distributing the forces of mastication more evenly across the remaining natural teeth and the edentulous (toothless) regions of the arches. This is particularly beneficial when there are missing teeth on both sides of the mouth. An RPD connects to the teeth on both sides of the mouth, which helps maintain the alignment and stability of the remaining dentition. In contrast, a fixed bridge typically relies on the adjacent natural teeth for support, which can result in increased load and stress on these abutment teeth. This additional stress can potentially lead to issues such as tooth decay, root fracture, or periodontal disease if not managed properly.
Of the three dimensions of colour, the one which describes the dominant colour of the object is
1. Hue
2. Value
3. Chroma
4. Maverick
Prosthodontics
Answer: 1
Hue refers to the attribute of a color that allows it to be classified as red, blue, green, etc. It is one of the three dimensions of color, along with value (lightness) and chroma (intensity or saturation).