MDS PREP
The first step in surveying the casts for RPD is
1) Establishment of guiding planes
2) Establishment of undercuts for retention
3) Establishment of tooth contour for aesthetics
4) None of the above
Prosthodontics
Answer: 1
The initial step in surveying casts for an RPD is the establishment of guiding planes. These planes are essential for determining the path of insertion and removal of the denture, which in turn affects the overall stability and function of the prosthesis. Once the guiding planes are established, other steps such as identifying undercuts for retention and aesthetic considerations can be addressed.
The stability of the mandibular complete denture is enhanced
1. When the level of the occlusal plane is above the dorsum of the tongue
2. When the tongue rests on the occlusal surfaces of lowers at rest
3. When the lateral borders are extended below the external oblique ridge
4. All of the above
Prosthodontics
Answer: 2
The stability of the mandibular complete denture is enhanced when the level of the occlusal plane is above the dorsum of the tongue.
For a semi adjustable articulator, the sagittal inclination of the incisal
guidance table is determined by
1. bringing the mandible approximately 6mm forward
2. bringing the cuspids into an end to end relationship
3. altering the vertical dimension till the incisal guide pin contacts the guide
table
4. bringing the central incisors into an end to end relationship
Prosthodontics
Answer: 4
Explanation: The sagittal inclination of the incisal guidance table is set to
match the patient's natural incisor relationship. By bringing the central
incisors into an end-to-end relationship, the articulator can be adjusted to
simulate the patient's individual incisal guidance, which is essential for
accurate jaw movement and occlusion.
Vibrating line is on the
1. Hard palate
2. Junction of hard and soft palate
3. Soft palate
4. Junction of muscularis uvulae and palatien muscle
Prosthodontics
Answer: 3
The vibrating line is on the junction of hard and soft palate.
The range of motion, as measured in millimeters, is least for the
1. pure hinge like opening and closing movement
2. protrusive movement
3. left lateral movement
4. Bennet movement
Prosthodontics
Answer: 4
Explanation:
Pure hinge-like opening and closing movement: The range of pure rotation in
the temporomandibular joint (TMJ) was determined to be up to 15–20 mm in the
1960s. However, recent research suggests that pure rotational movement may not
occur.
Protrusive movement: The normal range of motion for protrusive movement is
8–12 mm.
Left lateral movement: The normal range of motion for left lateral movement
is 8–12 mm. The normal range of motion for mouth opening is 35–60 mm.
The average immediate Bennett shift was found to be 1.05 mm on the left
side and 1.12 mm on the right side when firm guidance was used.
According to the House classification, patients who are positive in their own
minds that they can never wear artificial dentures are classified as having
1 an indifferent mind
2 an exacting mind
3 a philosophical mind
4 a hysterical mind
Prosthodontics
Answer: 4
Explanation: The House classification categorizes patients
based on their attitudes towards dentures. Those with a "hysterical mind" are
often resistant to the idea of wearing dentures, believing they cannot adapt to
them. This classification helps clinicians understand patient psychology and
tailor their approach accordingly.
The purpose of boxing an impression is
1. Boxing pressure the border width after border molding
2. To serve as a base for cast poured
3. Both A and B
4. None of the above
Prosthodontics
Answer: 3
The purpose of boxing an impression is both to serve as a base for cast poured and to boxing pressure the border width after border molding.
When setting teeth for a complete denture in bilateral balanced occlusion, if
the incisal guidance is steep, the
1 occlusal plane should be shallow
2 compensating curve should be steep
3 cuspal inclines should be shallow
4 condylar guidance should be made steep
Prosthodontics
Answer: 2
Explanation: In bilateral balanced occlusion, if the incisal
guidance is steep, it is necessary to create a compensating curve that is also
steep to maintain balanced occlusion during lateral movements. This helps to
ensure that the occlusal contacts remain balanced and stable, preventing tipping
or dislodgment of the denture during function. The other options do not
adequately address the need for balance in occlusion.