MDS PREP
The relationship of the denture base that resists dislodgement of denture in the horizontal direction is
1. Stability
2. Pressure
3. Support
4. Retention
Prosthodontics
Answer: 1
Terms:
Stability:
Stability refers to the ability of a denture to resist horizontal
forces that may cause it to move or dislodge. A stable denture base
remains in place during function, such as chewing or speaking, and is
crucial for the overall comfort and effectiveness of the prosthesis.
Stability is influenced by the design of the denture, the fit of the
base, and the anatomy of the underlying tissues.
Pressure:
Pressure refers to the force exerted by the denture base against the
underlying tissues. While pressure is important for retention and
support, it does not specifically describe the resistance to horizontal
dislodgement.
Support:
Support refers to the resistance of the denture base to vertical
forces. It is provided by the underlying bone and soft tissues, ensuring
that the denture does not sink into the tissues under occlusal load.
Retention:
Retention is the ability of the denture to stay in place against
vertical dislodging forces. It is primarily influenced by factors such
as the fit of the denture, the use of adhesives, and the presence of
suction or interfacial tension between the denture base and the oral
tissues.
The muscle which trims the posterior lingual areas of the lower denture is
1. Genioglossus and stylohyoid muscle
2. Palatoglossus and superior constrictor
3. Mentalis and buccinator
4. Medial pterygoid muscle, lateral pterygoid muscle
The muscle which trims the posterior lingual areas of the lower denture is palatoglossus and superior constrictor.
The following property of saliva affects denture retention
1. Quality and quantity of serous and mucus saliva
2. Quantity of mixed saliva
3. Quantity of only serous saliva
4. Both A and C
The property of saliva that affects denture retention is both quality and quantity of serous and mucus saliva.
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.
When there is a prematurity in centric occlusion but not in eccentric or other movements, then reduce
1) Cusps of opposing teeth
2) Mesiodistal position of teeth
3) Opposing fossa or marginal ridge
4) None of the above
Prosthodontics
Answer: 3
Explanation:In cases where there is a premature contact in centric occlusion, it is often necessary to adjust the opposing fossa or marginal ridge to achieve a more harmonious occlusion. This adjustment helps to eliminate the premature contact and allows for proper occlusal function.
Only pure hinge movementsof the mandible occur at
1) centric occlusion
2) centric relation
3) lateral exursion
4) terminal hinge position
Prosthodontics
Answer: 4
Only pure hinge movements of the mandible occur at terminal hinge position.
The primary purpose of rinsing the algina impression in watery mix of gypsum is to
1. Increase the gel strength
2. Prevent further gelatio
3. To decrease the shrinkage of the impression
4. To remove the residual saliva on the impression
Prosthodontics
Answer: 4
The primary purpose of rinsing the alginate impression in a watery mix of gypsum is to remove the residual saliva on the impression.
The main purpose of covering as much area as possible within functional limits by impression is to
1. Distribute the occlusal stresses and increase the peripheral seal
2. Increase the bulk of CD which helps to seat the denture
3. To increase the bulk of CD to prevent its fracture
4. All of the above
Prosthodontics
Answer: 1
The main purpose of covering as much area as possible within functional limits by impression is to distribute the occlusal stresses and increase the peripheral seal.