Let's discuss Q+ for NBDE part 2

[viplilia]

Which from the following is not right about additional cured silicones impres. materials:
a. give off ethyl alcohol during their setting reaction
b. can be pored more than once and still remain accurate
c. can poured after 24 hours and still remain accurate
d. rebound from undercuts without permanent deformation
e. may release H-gas during setting

Please help , my exam in 3 weeks

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[blueberry2011]

The answer is "a".

 

[Endodontia]

Answer is A. This is a property for condensation silicones...

Which from the following is not right about additional cured silicones impres. materials:
a. give off ethyl alcohol during their setting reaction
b. can be pored more than once and still remain accurate
c. can poured after 24 hours and still remain accurate
d. rebound from undercuts without permanent deformation
e. may release H-gas during setting

Please help , my exam in 3 weeks

 

[viplilia]

Why it is advisable to dispence the liquid component 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 of the mixing slab
e. to prevent evaporation of the volatile component



class 2 amalgam restor. has an overhang at gingival margin. this might have been caused by which of the following?
a. poor adaptation of the matrix band
b. poor carving
c. didn't wedge the matrix band




larger condensers and laterally applied condensation forces are recommended to ensure complete condensation of which of the following amalgam types?
a. admixed
b. spherical
c. lathe-cut
d. high-copper
e. conventional


dentists usually send their cemento-metal restoration cases to dental lab for fabrication. upon receiving the cases, these technicians most frequently complain that the
a. margins have been ill defined
b. teeth have been insufficiently reduced
c. shades for the restor. have been inadequately described
d. impressions or models are inaccurate.

I'm so bad in prostho and operative, if you have any suggestion or you know any clues to remember please let me know. thank you very much guys again you are the best