some confusing questions (part 2)

[hzleuven]

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I've got some confusing questions, and would like to ask for help:

1. Scrap amalgam is stored:
under sulfide?
under water?

2. Multiple periapical radiolucencies are common in patients with:
Dentinal dysplasia?
Cemento dysplasia?

4. What happens to the curve of Spee in a patient who lost teeth #19, and #20 has drifted:
curve of Spee is reversed. (Why it’s not deepened? )

5. What is the minimum thickness of porcelain to prevent fracture of the porcelain: 2mm ?????


7. The greatest decrease in radiation to a patient’s gonads can be achieved by:
a. change from D to E speed film or lead apron?
b. collimation?

8. All are advantages of hybrid light-cured ionomers (esthetics, , coefficient of expansion), but NOT: bond strength? OR wear resistance?

9. Additional cured silicones (polyvinyl Siloxane) are often the materials of choice for impressions for fixed restorations. Each of the following is true about these materials except one. Which one is this exception?
a. give off ethyl alcohol during their setting reaction
b. may released hydrogen gas during setting

2. why is it advisable to dispense the liquid component of cement of cement immediately before mixing?
a. to avoid absorption of moisture from the air
b. to avoid spreading over a large area of the slab
c. to allow tempering of the powder by the mixing slab
d. to reduce the temperature influence of the mixing slab
e. to prevent evaporation of the volatile components

 

[drika11]

I HOPE I HELP YOU! ANSWERS ARE IN RED ANY MORE QUESTIONS POST THEM!

1. Scrap amalgam is stored:
under sulfide?
under water?

2. Multiple periapical radiolucencies are common in patients with:
Dentinal dysplasia?
Cemento dysplasia?

4. What happens to the curve of Spee in a patient who lost teeth #19, and #20 has drifted:
curve of Spee is reversed. (Why it’s not deepened? ) is reversed b/c the curve begin at the tip of lower canine following the buccal cusps of natural PM and molar and continuing to the anterior border of ramus, so if tooth drifts the curve is reversed

5. What is the minimum thickness of porcelain to prevent fracture of the porcelain: 0.7mm ideal 1mm if less than 0.7 will not allow for proper thickness of opaquer and shoulder will be prone to fracture

7. The greatest decrease in radiation to a patient’s gonads can be achieved by:
a. change from D to E speed film or lead apron?
b. collimation?

8. All are advantages of hybrid light-cured ionomers (esthetics, , coefficient of expansion), but NOT: bond strength? OR wear resistance?

9. Additional cured silicones (polyvinyl Siloxane) are often the materials of choice for impressions for fixed restorations. Each of the following is true about these materials except one. Which one is this exception?
a. give off ethyl alcohol during their setting reaction
b. may released hydrogen gas during setting

2. why is it advisable to dispense the liquid component of cement of cement immediately before mixing?
a. to avoid absorption of moisture from the air
b. to avoid spreading over a large area of the slab
c. to allow tempering of the powder by the mixing slab
d. to reduce the temperature influence of the mixing slab
e. to prevent evaporation of the volatile components