MDS PREP
Problems associated with the patient with a prognathic ridge relationship
1. Teeth arrangement in the upper arch
2. Aesthetic problems
3. Retention of the dentures
4. All of the above
Prosthodontics
Answer: 4
Which of the following are most sensitive to X-ray?
1. Tooth buds and salivary glands
2. Nerve and muscle tissue
3. Hair and nails
4. Cartilage
Osteomalacia is
1. Defective osteoid + normal mineralization
2. Normal osteoid + defective mineralization
3. Abnormal osteoid + abnormal mineralization
4. Normal osteoid and demineralization
Osteomalacia is characterized by abnormal osteoid and abnormal mineralization.
What is the effect of adding potassium sulfate to gypsum-based materials?
1) It accelerates the setting reaction.
2) It retards the setting reaction.
3) It increases the porosity.
4) It has no effect on the setting reaction.
Potassium sulfate acts as an accelerator by increasing the solubility of the hemihydrate and promoting the formation of dihydrate, which speeds up the setting process.
Which material is carried in a custom tray?
1. High fusing compound
2. Reversible hydrocolloid
3. Metallic oxide paste
4. Irreversible hydrocolloid
Prosthodontics
Answer: 3
Which material is carried in a custom tray: metallic oxide paste.
An impending anterior crossbite should be treated
1) As soon as it is noticed before teeth reach occlusion
2) After eruption of all permanent teeth and orthodontic correction
3) As soon as canines erupt
4) Only by fixed appliance
Orthodontics
Answer: 1
When a cusp is in deflective occlusal contact only in centric relation, then
1) Reduce the cusp only
2) Reduce the opposing fossa or marginal ridge
3) Reduce both the fossa and the cusp
4) Reduce the opposing marginal ridge
Prosthodontics
Answer: 2
Epoxy resins are compatible with which of the following impression material :
1) Polysulphide impression material
2) Polyether impression material
3) Agar
4) Alginate
Dental Materials Answer: 2
Epoxy resins
· Abrasion resistance is many times greater than gypsum
· More expensive
· Undergoes 0.1 – 0.2% shrinkage, thus their shrinkage is approximately equal to gypsum. This is less of problem with newer formulations & polyurethane resin.
· Their detail reproduction is better.
· Hydrocolloids, polysulfides are not compatible with them.