MDS PREP
From the diagnostic casts, all of the following information can be gained except?
1. Gingival tissue contour and pocket depths
2. Axial inclination of the tooth
3. Arch form and contour
4. Occlusal interference
Prosthodontics
Answer: 1
From the diagnostic casts, all of the following information can be gained except gingival tissue contour and pocket depths.
Most semiadjustable articulators have a fixed intercondylar distance of
1. 200mm
2. 160mm
3. 70mm
4. 110mm
Prosthodontics
Answer: 4
Most semiadjustable articulators have a fixed intercondylar distance of 110mm.
Which of the following movement(s) is/are involved in the opening of the mouth?
1. Only hinge
2. Only translation
3. Hinge followed by translation
4. Translation followed by hinge
Prosthodontics
Answer: 3
The movement involved in the opening of the mouth is hinge followed by translation.
Incorporation of peripheral seal in an impression is necessary to obtain
1. Stability
2. Functionally moulded periphery
3. Harmonious occlusion
4. Posterior palatel seal
Prosthodontics
Answer: 2
Incorporation of peripheral seal in an impression is necessary to obtain functionally moulded periphery.
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 mean denture bearing area in the edentulous mandible is approximately 12.25 cm square.
Internal resorption in a tooth is seen as
1. Calcium hydroxide pulpotomy
2. Replacement resorption
3. Non-proliferation lesion
4. Desensitizing tooth
Prosthodontics
Answer: 3
Internal resorption in a tooth is seen as a non-proliferation lesion.
The inter-arch distance measure when the occlusal rims are in uniform contact is
1. Freeway space
2. Vertical dimension of occlusion
3. Vertical dimension of rest
4. Christensen"s space
Prosthodontics
Answer: 2
The inter-arch distance measured when the occlusal rims are in uniform contact is vertical dimension of occlusion.
The most reproducible relation of the jaws that is used in fixed denture construction
1) Centric occlusion
2) Centric relation
3) Protrusive contact position
4) Lateral contact position
Prosthodontics
Answer: 2
The most reproducible relation of the jaws that is used in fixed denture
construction is Centric Relation (CR). Here's a detailed explanation of the
options provided and why Centric Relation is the correct answer:
1) Centric Occlusion (CO): This is the position of the mandible where the
incisor and posterior teeth of the maxilla and mandible are in maximum
intercuspation, meaning the teeth are in their most closed and stable contact.
It is the position that occurs when the condyles are in the most superior and
anterior position in the glenoid fossae of the temporal bones. While important
for the function of the teeth, centric occlusion is not always a reliable
reference for the construction of a fixed denture, as it can be influenced by
various factors such as tooth wear, pathology, or parafunctional habits.
Moreover, it is a dynamic relationship that can change over time.
2) Centric Relation (CR): Centric relation is the most retruded, unstrained
position of the mandible on the maxilla from which the mandible can move to the
lateral and protrusive positions. It is the basis for the articulators in
dentistry and is considered the most reproducible jaw relationship for the
fabrication of fixed dentures. CR is determined by the temporomandibular joint
(TMJ) and does not involve tooth contact. This is crucial because it provides a
consistent and predictable starting point for constructing a denture that will
function harmoniously with the TMJ and the surrounding soft tissues. It is the
position where the condyles are in a centric relation with the fossa and the
disk is properly situated, which minimizes strain and maximizes stability during
function.
3) Protrusive Contact Position: This is the position of the mandible where the
incisor or canine teeth make contact with the maxilla in a forward and downward
movement. While it is a functional movement of the jaw, it is not a stable or
reproducible position for the construction of fixed dentures because it is
highly dependent on the muscles and may not be consistent across different
individuals or even during different occasions for the same individual.
4) Lateral Contact Position: This refers to the position of the mandible during
lateral movements, where the teeth contact the maxilla on the side of the arch.
Similar to protrusive contact, it is a functional position that is influenced by
muscle activity and not a stable reference for denture construction. Lateral
movements are also not the primary focus in fixed denture construction, which is
mainly concerned with the vertical and anteroposterior relationships of the
jaws.