MDS PREP
Muscles involved in centric relation
1. Temporalis and masseter
2. Medial and lateral pterygoids
3. Temporalis and lateral pterygoid
4. None of the above
Prosthodontics
Answer: 1
Muscles involved in centric relation are temporalis and masseter.
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.
The distofacial border of the mandibular complete denture is limited by the action of
1. Masseter
2. Genioglossus
3. Geniohyoid
4. Mylohyoid
Prosthodontics
Answer: 1
The distofacial border of the mandibular complete denture is limited by the action of masseter.
Mandible can be made into retruded position for recording the centric relation by
1. Protrude and retrude mandible alternately
2. Repeating the word "M" and relaxing
3. Making the tongue touch the posterior palate
4. All of the above
Prosthodontics
Answer: 4
The mandible can be made into retruded position for recording the centric relation by all of the above: protrude and retrude mandible alternately, repeating the word "M" and relaxing, making the tongue touch the posterior palate.
Which of the following is true regarding clasp retention?
1. Cast gold clasps cannot engage greater depth of undercuts than cast
cobalt-chromium alloy clasps of equal dimensions
2. It does not depend on the material from which it is fabricated
3. A wrought clasp requires greater under cut than a cast clasp
4. A cast clasp requires greater undercut than a wrought wire clasp
Prosthodontics Answer: 3
Explanation: Wrought wire clasps are more flexible than cast clasps, allowing them to engage undercuts more effectively. However, they require a greater depth of undercut to achieve the same retention as cast clasps. This is because wrought wire clasps can flex and adapt to the contours of the tooth better than rigid cast clasps. The other statements are incorrect regarding the comparative abilities of clasp materials and their engagement with undercuts.
The occlusal plane for the complete denture patient is determined by
1. The face bow device which determines the occlusal plane
2. The position of the upper first molar
3. The height of the retromolar pad and anterior aesthetic height
4. None of the above
The occlusal plane for the complete denture patient is determined by the height of the retromolar pad and anterior aesthetic height.
Lateral throat form occupied by retromylohoid flange in lower denture
1) Has nothing to do with the denture
2) Should be large, one-half inch
3) Should be small, less than half inch
4) Should be larger, more than 2 inches
Prosthodontics
Answer: 2
The retromylohyoid area is an important anatomical region in the lower denture that contributes to the retention and stability of the denture. The lateral throat form, which is the space between the retromylohyoid flange and the surrounding tissues, should be adequately large (approximately one-half inch) to allow for proper function and comfort of the denture. A well-formed lateral throat area helps in achieving a good seal and prevents food impaction.
The distal palatal termination of the complete denture is dictated by the
1. Tuberosity
2. Vibrating line
3. Fovea palatine
4. Maxillary tori
Prosthodontics
Answer: 2
The distal palatal termination of the complete denture is dictated by the vibrating line.