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56 Cards in this Set

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1. T or F
_____ most dentures have undercuts to some degree.
True
2. Attempting to pry a denture from its processing (master) cast will probably result in:
a. breaking the denture
b. distorting the denture
3. Undercuts on upper dentures are found:
a. commonly beneath the labial flanges
c. frequently in tuberosity areas
4. Mandibular denture undercutsw are most commonly found:
c. lingual flange regions bilaterally
d. under the labial flanges, anteriorly
5. T or F
_____ Undercut casts must be sectioned with a saw to remove smaller pieces as careful as possible.
True
6. From the list below, select the equipment and materials needed to recover a processed denture
from a master cast.
a. a plaster saw and blades
b. a pneumatic chisel
d. a shell blaster
f. sodium citrate solution
7. T or F
_____ recovering a denture from its processing cast requires considerable care in sawing and a practical sense of where and how to apply pressure in dislodging the pieces.
True
8. Uh-oh, I was sniffing the monomer jar again and now I can't remember how to recover dentures! I have the steps here, but they aren't in order. Can you arrange them into their correct order for me.
c. Make initial cuts with a plaster saw.
a. remove segments gently by wedging a knife blade in the cut.
b. use a small pneumatic chisel to cut out the pieces that remain in ridge areas.
e. use shell blaster to clean away particles of stone
d. soak denture in sodium citrate solution
9. T or F
when using a plaster saw, it is very easy to cut into the resin without realizing it.
True
10. One way to improve visibility while making cuts is to :
d. saw the cast under clear running water
11. When sawing a cast you should saw a short distance, remove the saw from the cut, and_______________.
check for depth
12. When sawing a cast, you should pay special attention to a maxillary denture with a
_________________ since the palate will be on a level with the peripheral borders of the denture.
b. walnut shell particles
14. T or F
_____ A shell blaster is designed to remove large amounts of stone from a cast
FALSE ( it is designed to remove small bits of stone)
15. To prevent warping or burning of the denture when shell blasting a denture, it is a good idea to:
a. not hold the denture closer than 4 inches from the blaster's nozzle
c. keep the piece of work moving while it is under the shell stream
16. To dissolve away the last bits of remaining stone after shell blasting, a denture should besoaked in a solution of ____.
sodium citrate.
17. T or F
_____ abrasive materials should never be applied to the tissue surfaces of a denture
unless:
d. the tissue surface is smooth.
18. JEOPARDY QUESTION: " This process of contouring a denture brings it to a desired shape and thickness.'
What is finishing?"
19. If a wax trial denture is properly ___, ___, and____, there will be little need for finishing work.
waxed, packed, and polymerized.
20. Arrange the steps for finishing a denture into their correct order.
c. Remove all flash and sharp edges of resin from the peripheries of the denture
b. remove flash from around necks of teeth.
d. remove resin bubbles from all surfaces.
a. Smooth the eminence contours at the base of the denture teeth.
21. JEOPARDY QUESTION: "This procedure removes all scratches from the denture base and produces a generally glossy finish."
"What is polishing?"
22. After proper polishing procedures, a denture will:
a. accumulate less food debris
b. be easier to clean
c. becomes more stain resistant
23. T or F
_____ Polished surfaces feel better to a patient's tongue and are less likely to irritate
other surrounding tissues.
True
23. T or F
_____ Polished surfaces feel better to a patient's tongue and are less likely to irritate
other surrounding tissues.
True
25. T or F_
____ A highly reflective, mirror like appearance is the desired level of polish for a denture base.
FALSE (this level of finish will "advertise" the work as being a
denture)
26. T or F
_____ Each abrasive polishing agent should be used with its own wheel and brush. They
should not be used interchangebly.
true
27. T or F
_____ During polishing, the denture should be kept moving.
True
28. Pressing against a wheel too hard while polishing cause the denture to:
c. get hot and scorch
29. A denture that has acrylic resin teeth should have the ___ and__surfaces of the teeth covered with adhesive tape.
lingual and facial
30. Arrange the steps for polishing a denture into their correct order.
a. Polish denture teeth that have been selectively ground
b. polish the denture with tripoli on a different set of wheels and brushes
c. complete final polishing with a soft, dry rag wheel impregnated with commercial
polishing compound.
d. Protect the teeth with adhesive tape.
e. polish the denture base with wet pumice applied to a wet rag wheel running at low
speed
f. Use soap and water to scrub all polishing compound residue from the denture surfaces
D, E, B, A, C, F
31. Used properly, a wet rag wheel at low speed with wet pumice will:
a. reach all flat surfaces and contoured surfaces
b. reach all flat surfaces and most contoured surfaces
c. reach some flat surfaces and most contoured surfaces
d. will reach some flat surfaces and all contoured surfaces
B
32. The edge of a wet rag wheel at low speed used with wet pumice is useful for polishing___ or other hard to reach places.
concavities
33. If a rag wheel cannot reach all portions of the palatal area in a maxillary denture, use:
a. wet pumice and a small felt cone
b. dry pumice and a large felt cone
c. wet pumice and a large felt cone
d. dry pumice and a small felt cone
C
34. Pumice applied with a ____ smooths otherwise inaccessible interproximal areas.
brush wheel
35. After polishing with pumice and wet wheels, the next step for polishing a denture is to use:
a. tripoli on a different set of wheels and brushes
b. rouge on a different set of wheels and brushes
c. tripolee on a different set of wheels and brushes
d. plaster polish compound
A
36. T or F_____ When all denture surfaces are smooth, you should wash all the pumice residue from the denture base and dry the denture
True
37. JEOPARDY QUESTION: "This process can be accomplished by applying a slowly revolving,
off center #6 round bur to desired portions of a denture, but should only be done at the dentist's request.
"What is negative stippling?"
38. T or F
______ An off center #6 bur can be made by heating the shank in a flame and bending it
90 degrees..
FALSE ( it is made by putting a slight bend into the shank, not 90
degrees)
39. Placing a bend in a bur causes the bur to wobble when it runs and produces a___ effect on a resin surface.
Stippled
40. Denture teeth that have been selectively ground do not require polishing operations.
FALSE ( they do need to be polished)
41. Denture teeth should be polished with ____impregnated with_____ to smooth over cusp and fossa irregularities.
pointed rubber wheels ; carbonundum grit
42. T or F:
_____Using flour of pumice and a finely abrasive commercial compound will produce a dull, satin polish on denture teeth.
FALSE (it produces a high polish)
43. Dentsply makes a fine abrasive commercial agent called:
a. Tri-polish #3
b. Tru-polish #3
c. Three polish #3
d. Tripoli #3
B
44. T or F:
_____ When polishing selectively ground denture teeth, you must be careful to not destroy the details of the occlusal surfaces
True
45. Final polishing of the denture base is done with a __ impregnated with_ formulated for use with acrylic resin..
soft, dry rag wheel ; commercial polishing compound
46. T or F:
_____ After polishing is complete, the denture should be washed and all polishing compound residue should be removed.
True
46. T or F
:_____ After polishing is complete, the denture should be washed and all polishing compound residue should be removed.
B & C
48. All appliances made from acrylic resin should be stored in a sealed plastic bag that contains:
a. bleach and water solution
b. water
c. benzene
d. ammonia and water solution
B
49. T or F:
_____ When shipping acrylic resin appliances, they should be shipped in a container
that contains a little bit of water
True
50. Occasionally, dentures do show defects. List at least three common denture errors.
(Denture tooth movement and Incisal Guide Pin
Openings in excess of Acceptable limits);
(Porosity in the denture base); (Fractured Denture Teeth);
(Grainy Appearing Resin); (Denture Base streaks)
a. Denture tooth movement
1. Using excessive packing pressure
2. Using Plaster instead of dental stone
6. Placing additional resin in the mold after trial packing and before final close* in the flasking procedure
(A = 1, 2, 6 );
b. Excessive Incisal
guidepin openings
5. Failing to achieve complete metal to metal contact when flask is closed
6. Placing additional resin in the mold after trial packing and before final close*
(B = 5, 6);
c. Porosity
7. Using insufficient pressure in the mold
20. Packing the resin dough before it was ready
13. Running the mold up to the curing temperature too rapidly
(C = 7, 20, 13);
d. Fractured denture teeth
11. Applying packing pressure too rapidly
12. Careless deflasking
15. Using resin dough that was too stiff when it was packed.
18. Setting denture teeth in direct contact with the cast.
19. Grinding porcelain denture teeth with a course stone
(D = 11, 12, 15, 18, 19);
e. Grainy appearing resins
3. Using insufficient monomer to wet all of the powder
10. Letting a packed case stand for a long period before curing
E = 3, 10)
f. Craze or check lines
in the acrylic resin
16. Allowing the plastic to come into contact with a highly volatile solvent such as acetone or chloroform
(F = 16
g. Denture base streaks
4. Contamination with dirt and oils from bare hands
8. Failure to stir the monomerpolymer mix thoroughly
9. Dry crusts of resin somehow become
incorporated into the mix.
14. Flaking of tinfoil substitute
17. Using Excess monomer
(G = 4, 8, 9, 14, 17)