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75 Cards in this Set

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1. The objective of the deflasking procedure is to remove the denture from the investment material
without:
a. breaking the denture
b. exposing the denture to leftover monomer
c. dislodging the denture from the cast
d. exposing the polymerized acrylic resin to oxygen
A and C
2. The denture flask and its contents should be kept at _______°F before deflasking.
a. 100
b. 70
c. room temperature
d. 60
C
3. The equipment needed to deflask a denture includes:
a. Plaster knife
b. two chisels
c. wax spatula
d. plaster saw
e. flask ejector unit
A, B, D, E
4. Arrange the steps for deflasking a denture into their correct order.
a. Using inward and downward pressure, apply force until the flask halves come
apart
b. Make sure the flask is cool
c. Place flask in the ejector unit
d. Close the unit and pass the chisels through the holes in the sides of the
ejector into the slots between the two halves of the flask
e. Remove lid of flask with plaster knife
B, E, C, D, A
5. T or F
:____ Chisels act as levers, and the sides of the ejector as fulcrums, making it quite easy to separate the mold from the flask
TRUE
(give me a lever long enough, and a prop strong enough,and I can single‐handedly move the world….Archimedes)
6. When the denture flask is placed into the ejector unit, the knockout plate should be:
a. face up
b. face down
c. be removed first
d. hit with a hammer lightly first
A
7. Arrange the steps for removing a denture cast from the investment mold into their correct order.
e. Pry off the occlusion cap to exposing the cusp tips and incisal edges of the
denture teeth.
d. In specific areas, cut the outer walls of the stone mold with a plaster saw.
b. Pry the sectioned stone mold away from the facial surfaces of the denture
with a plaster knife.
a. Trim stone away from lingual areas of anterior teeth.
f. Take out inner sections of the maxillary and mandibular mold.
g. remove all debris from indexing grooves and base of the cast.
c. clean away any remaining plastic bubbles or stone residue from the
denture teeth.
E, D, B, A, F, G, C
8. T or F:
_____ Saw cuts should be made in the areas around the canines, taking care not to saw into
the denture
True
9. T or F:
_____ Trimming stone away from the lingual portion of anterior denture teeth before removing excess inner stone prevents the possibility of the denture snapping in half
FALSE ( it helps reduce the possibility of the denture lifing
off the cast when the inner portion of the mold is removed).
10. After deflasking, if there is any evidence that the denture has come loose from the cast, the lab
tech must:
c. ask the dentist if the case should be remounted onto the articulator
11. T or F:
_____Dentures should not be shell blasted during the deflasking procedure.
True
12. Shell blasting a denture on the cast can cause:
a. The denture to be lifted from the cast
b. Shell fragments to lodge between the dentuere and the cast
c. the denture to not fit on the cast right again, making proper fit impossible.
d. the denture to split in half, or abrade denture teeth so quickly they lose function
A, B, C,
13. T or F:
_____ Remounting and selective grinding corrects contact relation changes in denture teeth that may have occurred during processing.
True
14. The most common change that occurs with compression molded, heat‐cured dentures is:
d. loss of VDO
15. Increases in VDO in the range of ______mm to ______mm are acceptable.
0.25 to 0.5
16. Two common changes in contact relation of denture teeth that can occur during processing are
(list them):______ _______
Change in VDO, Tooth shifting
17. Circle all that apply. Reasons that denture teeth may shift in position include:
a. Baseplate wax is unstable, and denture teeth can drift easily in trial denture.
b. Setting expansion of the stone used to flask the wax denture.
c. Not removing excess stone in incisal areas of denture teeth after deflasking.
d. Resin packing pressures during trial packs and final close
e. During polymerization, the resin expands and contracts, possibly moving teeth.
A, B, D, E
18. T or F:
_____ Acrylic resin dough expands when it is heated, and contracts when it is cooled.
True
19. When rearticulating a denture, retention grooves should be carved with a:
19. When rearticulating a denture, retention grooves should be carved with a:
20. Retention grooves should be placed onto ______________ areas of the cast:
a. right and left buccal, anterior, and posterior
21. Before rearticulating a denture, the bottom of the cast and _______________ must be completely clean
and free of debris.
Index Keys.
22. T or F
:_____ While rearticulating a denture, total contact between the cast and the mounting must be achieved.
True
23. It is not a good idea to cover the entire junction line of a denture / mounting when rearticulating the denture because:
c. it will mask the junction line, and you will not be able to tell if the denture is firmly seated against the mounting
24. The objective of selective grinding a denture is to:
a. reduce the cusp angles to more acceptable levels
b. increase the depth of the fossa’s
c. add anatomy for esthetics
d. eliminate premature tooth contacts in a wide range of jaw movements.
D [from the book, pg 98, b: The objective of selectively grinding complete dentures for balance is to eliminate premature tooth contacts (interferences) that prevent multiple, well distributed points of contact
between upper and lower teeth, in anterior and posterior areas, on the right and left, during working, balancing, and protrusive occlusion]
25. List three types of tooth interferences that may be present on a complete denture prior to
selective grinding.
high spots,
deflective contacts,
prematurities
26. Match the type of interface with the type of mark it will leave when articulating paper is used on the occlusal surface.
TYPE OF CONTACT
MARKS LEFT BY ARTICULATING PAPER
a. proper contact
i. white spots surrounded by
carbon rings or “donuts”.
b. light contact
ii. A single dark spot on the tooth
c. contact too strong
iii. A faint smudge is left on the teeth
(a – ii); (b – iii); (c – i)
27. T or F:
_____ when a denture is properly balanced, marks will reveal themselves as solid dark spots in all areas of contact.
True
28. From the list below, choose the equipment and materials that are recommended for selective
grinding operations.
a. black and red articulating paper (the thinnest available)
b. engine and handpiece
c. hand‐held wax carving tools
d. burnishing tools
e. mounted stones and diamonds for the straight handpiece.
f. milling paste
A, B, E, F
29. The _______ bur attachment is especially recommended for selective grinding operations
#6 ball diamond
30. The major procedures for selective grinding operations are (circle all that apply):
a. correct the VDO
b. restore CO
c. correct working and balancing occlusion
d. correct protrusive occlusion
e. mill‐in the dentures
A thru E
31. Before attempting any corrections, you must make sure the readings on the articulator are the same as when the denture teeth were set in wax, including making sure that the__ and the __ are properly placed.
condylar elements / incisal guide pin.
32. T or F:
_____ Before making selective grinding adjustments, the incisal guidepin should be in the
same setting as when the case was finally waxed.
True
33. T or F
:_______ bulk grinding on several teeth to re‐establish the compensating curve is acceptable.
FALSE (Only grind on an isolated tooth that has clearly
migrated out of line. Do not grind on several teeth just to “touch up” your compensating curve.)
34. In a set of complete dentures, a pin opening of ______mm is the limit of reasonable acceptability.
1mm
35. In a single complete denture, a pin opening of _______mm is the limit of reasonable acceptability.
0.5mm (half that of a set of dentures)
36. If 2mm of incisal pin opening is present and isolated migration of a tooth is not responsible for it,
you should:
a. use selective grinding operations to close the gap to acceptable limits.
b. use a fine cutting disk to remove 1mm of acrylic from the denture base, then
re‐process the denture to repair your cut.
c. notify the dentist that the patient needs to come back in for preliminary impressions.
d. Do not proceed until you consult the dentist.
D
37. When deepening surfaces marked by articulating paper opposite stamp cusps, you should:
a. use black articulating paper to mark the high spots on the left and right sides
b. tap the denture together gently
c. use red articulating paper for marking high spots, not black
d. Make corrections by grinding stamp cusps only
e. being careful to not grind stamp cusp tips.
A, B, E
38. When deepening surfaces marked by articulating paper opposite stamp cusps, it is acceptable to grind on ___ ,__ and ____.
fossae, proximal marginal ridges, cusp inclines.
39. When the incisal guide pin is touching the table, and there are multiple, evenly distributed points of contact between MAX and MAND teeth, you have restored:
Facebow replication position
40. In complete dentures, the cusp to __________________ approach to cusp placement is typically used.
“occlusal embrasure”
41. Occasionally, contacts between opposing anterior teeth develop during correction of vertical processing errors. When this occurs, it is best to selectively grind the____ as needed, until proper function is restored.
d. facioincisal surfaces of MAND anteriors.
42. There are ________ paths of travel possible when newly remounted dentures are moved into working and balancing relations.
2
43. The 2 paths of travel possible when newly remounted dentures are moved into working and balancing relations are (circle all that apply):
a. a path along which the upper and lower teeth mesh best
b. a path governed by the way the articulator settings guide the upper member through lateral movements
c. a path along the lingual surfaces of MAX canines called canine guidance.
d. a path which causes the mandibular anteriors to lock.
A and B
44. T or F:
_____ After remounting a denture to an articulator, getting the teeth to mesh using the “tooth guided” path is a reliable method for correcting interferences between denture teeth along that path.
FALSE (according to the book, it is an unreliable method)
45. T or F:
_____ The only way to correct interferences between denture teeth is to use the path that is
dictated by articulator settings.
True
46. The objective of correcting working and balancing occlusion is to:
once again make the tooth guided lateral paths and the articulator guided lateral paths coincide.
47. When checking working and balancing jaw movements for a denture, it is important to
incorporate ___________.
Sideshift
48. T or F:
_____ Red articulating paper is used when checking balancing and working sides of a denture because it will not be confused with the black marks left when VDO and CO were corrected.
True
49.T or F:
_____ When checking the working side, posterior teeth should not have any contact cause by working side collisions.
True
50. If Anterior interference is present, you should grind the:
a. facioincisal surface of lower anteriors as needed
b. lingual surface of upper anteriors as needed
c. incisal surface of lower anteriors as needed
d. facioincisal surface of upper anteriors as needed
A or B
51. When working on the ____ side of a denture in a lateral movement, the ___rule is used.
Working ; BULL
52. T or F:
_____ Grinding on the “balancing” side of a denture in a lateral excursion movement will help correct high spots on the working side, if the BULL rule is followed.
FALSE (do not grind on the balancing side by applying the
BULL rule, only the working.)
53. When grinding on a complete denture to correct working / balancing movements, you notice
some red marks are left by articulating paper and you decide that selective grinding is needed on the working side . Following the BULL rule, select the choices below that would be acceptable to grind
on. (all teeth are on working side)
a. Mesiobuccal cusp of the MAX 1st molar
b. Mesiolingual cusp of the MAND 2nd molar
c. Distolingual cusp of MAND 3rd molar
d. Distobuccal cusp of MAX 3rd molar
e. Mesiobuccal cusp of MAX 2nd molar
f. Mesiolingual cusp of MAX 1st molar
A, B, E, (while C and D are technically correct for the BULL rule, don’t forget that 3rd molars are not reproduced in complete dentures)
54. The only cusp inclines on the balancing side of a complete denture that are candidates for grinding to correct working / balancing interferences are the:
a. inclines and cusp tips associated with the buccal cusps of the mandibular teeth
b. cusp inclines only (no cusp tips) associated with the buccal cusps of the mandibular teeth
c. cusp tips and inclines associated with the lingual cusps of the maxillary teeth
d. cusp inclines only (no cusp tips) associated with the lingual cusps of the maxillary teeth.
A (all other red markings should be disregarded on the
balancing side.)
55. T or F:
_____ Working and balancing corrections are done together, so red articulating film should be placed on both the balancing and working side prior to checking lateral excursion.
True
56. The working and balancing sides are correct when:
b. numerous, well distributed working and balancing side contacts develop
57. The practical limit of a lateral excursion test movement is ___________.
a. cusp tip contact
b. cusp to fossa contact
c. cusp to cusp contact
d. cusp ridge contact
D
58. Arrange the steps for performing a RIGHT lateral excursion and selective grinding operations
into their correct order.
a. Move the articulator into a right lateral excursion (right side becomes working side)
b. Selectively grind until proper contacts are achieved.
c. Observe marks left by articulating film, BULL cusps of working side, and buccal cusps and inclines of MAND teeth
d. Place red articulating paper between MAX and MAND teeth on both the right and left sides
e. Lock down the right condylar element and release the left on the articulator
E, D, A , C, B
59. T or F:
_____ To correct protrusive interferences, it is important to grind the appropriate inclines, but to not reduce the height of any of the cusps.
True
60. The practical limit of a protrusive excursion is:
a. when the incisors are edge to edge
b. when the incisors are just short of edge to edge relationship
c. the posteriors are just short of cusp to cusp tip relationship
d. the posteriors are touching cusp to cusp tip
A and C
61. Contact between the upper and lower anteriors with no posterior contact is achieved by:
a. grinding facioincisal surfaces of MAND incisors
b. grinding lingual surfaces and incisal edges of MAX anteriors
c. grinding facial surfaces of MAX anteriors
d. grinding lingual surfaces of MAND anteriors.
A and B (B as a last resort)
62. JEOPARDY QUESTION: “As a last resort for achieving contact between upper and lower anteriors with no posterior contact, it is acceptable to grind on lingual surfaces and incisal edges of these teeth.”
What are maxillary anterior teeth?
63. Contact between the upper and lower posterior teeth with no anterior contact can be achieved by:
a. grinding distal inclines of MAX buccal cusps
b. grinding premature mesial inclines on MAND lingual cusps
c. milling the occlusion where
articulating paper leaves marks
d. as a last resort, milling facioincisal surfaces of MAX anteriors
A and B
64. The process of covering the occlusal surfaces of the teeth with abrasive paste and with the teeth in contact, rubbing off any remaining small interfaces is called:
c. Milling‐in the occlusion
65. There are _______ varieties of abrasive paste available for milling operations.
2 (one for porcelain teeth , the other for [acrylic?] )
66. Arrange the procedures for milling‐in the occlusion into their correct order.
a. Place the abrasive paste on the occlusal surfaces of the teeth.
b. Raise the incisal guide pin above the incisal guide table
c. Release centric locks so the upper member of the articulator moves freely
d. From CO position, engage in protrusive movements about 5 times, returning to CO each time.
e. Repeat the entire operation 3 or 4 times.
f. From CO position, engage in right and left lateral movements about 5 times for each side, returning to CO each time.
b, c, a, f, d, e
69. T or F:
_____ After remounting a case, if the incisal guidepin does not touch the plate, you should consult the dentist before proceeding.
FALSE (Only if the pin is off the plate > 2mm)
70. T or F:
_____ The mandibular arch should be the first arch adjusted because the mandibular teeth are almost set on a flat plane.
True
71. T or F:
_____ Teeth that do not conform to the monoplate can be detected by rubbing a flat glass plate across the entire arch form. The glass will leave glass oxides on high spots, marking them.
FALSE (A flat aluminum plate should be used, not a glass
plate)
72. T or F:
_____ High spots can be reduced by using the edge of an abrasive wheel mounted in a
handpiece.
True
73. T or F:
_____ Once the occlusal plane of the mandibular arch is flat, the articulater should be locked
and the lower arch shoult not be touched again for grinding
True
74. For dentures with acrylic teeth, the denture can be removed from the articulator and the occlusal surfaces of the teeth can be sanded against a glass slab wrapped in ___ grit wet or dry
sandpaper..
b. 320
75. T or F:
_____ When grinding MAX teeth in a denture, high spots are located by applying two pieces of articulating paper, one on the right and the other on the left
True
76. T or F:
_____ Grinding on Maxillary teeth should be continued until the incisal guide pin touches the plate
True
77. T or F:
When grinding a high spot, you should zero in on that area until no grinding is required on that spot.
FALSE (You should grind a little bit in the spots surrounding the high point to avoid ditching and creation of posterior vertical overlap).