Deflasking, Remounting, And Selectively Grinding Compression Molded Complete Dentures.

Front 1

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

Back 1

A and C

Front 2

2. The denture flask and its contents should be kept at _______°F before deflasking.
a. 100
b. 70
c. room temperature
d. 60

Back 2

C

Front 3

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

Back 3

A, B, D, E

Front 4

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

Back 4

B, E, C, D, A

Front 5

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

Back 5

TRUE
(give me a lever long enough, and a prop strong enough,and I can single‐handedly move the world….Archimedes)

Front 6

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

Back 6

A

Front 7

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.

Back 7

E, D, B, A, F, G, C

Front 8

8. T or F:
_____ Saw cuts should be made in the areas around the canines, taking care not to saw into
the denture

Back 8

True

Front 9

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

Back 9

FALSE ( it helps reduce the possibility of the denture lifing
off the cast when the inner portion of the mold is removed).

Front 10

10. After deflasking, if there is any evidence that the denture has come loose from the cast, the lab
tech must:

Back 10

c. ask the dentist if the case should be remounted onto the articulator

Front 11

11. T or F:
_____Dentures should not be shell blasted during the deflasking procedure.

Back 11

True

Front 12

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

Back 12

A, B, C,

Front 13

13. T or F:
_____ Remounting and selective grinding corrects contact relation changes in denture teeth that may have occurred during processing.

Back 13

True

Front 14

14. The most common change that occurs with compression molded, heat‐cured dentures is:

Back 14

d. loss of VDO

Front 15

15. Increases in VDO in the range of ______mm to ______mm are acceptable.

Back 15

0.25 to 0.5

Front 16

16. Two common changes in contact relation of denture teeth that can occur during processing are
(list them):______ _______

Back 16

Change in VDO, Tooth shifting

Front 17

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.

Back 17

A, B, D, E

Front 18

18. T or F:
_____ Acrylic resin dough expands when it is heated, and contracts when it is cooled.

Back 18

True

Front 19

19. When rearticulating a denture, retention grooves should be carved with a:

Back 19

19. When rearticulating a denture, retention grooves should be carved with a:

Front 20

20. Retention grooves should be placed onto ______________ areas of the cast:

Back 20

a. right and left buccal, anterior, and posterior

Front 21

21. Before rearticulating a denture, the bottom of the cast and _______________ must be completely clean
and free of debris.

Back 21

Index Keys.

Front 22

22. T or F
:_____ While rearticulating a denture, total contact between the cast and the mounting must be achieved.

Back 22

True

Front 23

23. It is not a good idea to cover the entire junction line of a denture / mounting when rearticulating the denture because:

Back 23

c. it will mask the junction line, and you will not be able to tell if the denture is firmly seated against the mounting

Front 24

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.

Back 24

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]

Front 25

25. List three types of tooth interferences that may be present on a complete denture prior to
selective grinding.

Back 25

high spots,
deflective contacts,
prematurities

Front 26

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

Back 26

(a – ii); (b – iii); (c – i)

Front 27

27. T or F:
_____ when a denture is properly balanced, marks will reveal themselves as solid dark spots in all areas of contact.

Back 27

True

Front 28

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

Back 28

A, B, E, F

Front 29

29. The _______ bur attachment is especially recommended for selective grinding operations

Back 29

#6 ball diamond

Front 30

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

Back 30

A thru E

Front 31

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.

Back 31

condylar elements / incisal guide pin.

Front 32

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.

Back 32

True

Front 33

33. T or F
:_______ bulk grinding on several teeth to re‐establish the compensating curve is acceptable.

Back 33

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.)

Front 34

34. In a set of complete dentures, a pin opening of ______mm is the limit of reasonable acceptability.

Back 34

1mm

Front 35

35. In a single complete denture, a pin opening of _______mm is the limit of reasonable acceptability.

Back 35

0.5mm (half that of a set of dentures)

Front 36

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.

Back 36

D

Front 37

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.

Back 37

A, B, E

Front 38

38. When deepening surfaces marked by articulating paper opposite stamp cusps, it is acceptable to grind on ___ ,__ and ____.

Back 38

fossae, proximal marginal ridges, cusp inclines.

Front 39

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:

Back 39

Facebow replication position

Front 40

40. In complete dentures, the cusp to __________________ approach to cusp placement is typically used.

Back 40

“occlusal embrasure”

Front 41

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.

Back 41

d. facioincisal surfaces of MAND anteriors.

Front 42

42. There are ________ paths of travel possible when newly remounted dentures are moved into working and balancing relations.

Back 42

2

Front 43

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.

Back 43

A and B

Front 44

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.

Back 44

FALSE (according to the book, it is an unreliable method)

Front 45

45. T or F:
_____ The only way to correct interferences between denture teeth is to use the path that is
dictated by articulator settings.

Back 45

True

Front 46

46. The objective of correcting working and balancing occlusion is to:

Back 46

once again make the tooth guided lateral paths and the articulator guided lateral paths coincide.

Front 47

47. When checking working and balancing jaw movements for a denture, it is important to
incorporate ___________.

Back 47

Sideshift

Front 48

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.

Back 48

True

Front 49

49.T or F:
_____ When checking the working side, posterior teeth should not have any contact cause by working side collisions.

Back 49

True

Front 50

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

Back 50

A or B

Front 51

51. When working on the ____ side of a denture in a lateral movement, the ___rule is used.

Back 51

Working ; BULL

Front 52

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.

Back 52

FALSE (do not grind on the balancing side by applying the
BULL rule, only the working.)

Front 53

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

Back 53

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)

Front 54

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.

Back 54

A (all other red markings should be disregarded on the
balancing side.)

Front 55

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.

Back 55

True

Front 56

56. The working and balancing sides are correct when:

Back 56

b. numerous, well distributed working and balancing side contacts develop

Front 57

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

Back 57

D

Front 58

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

Back 58

E, D, A , C, B

Front 59

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.

Back 59

True

Front 60

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

Back 60

A and C

Front 61

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.

Back 61

A and B (B as a last resort)

Front 62

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.”

Back 62

What are maxillary anterior teeth?

Front 63

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

Back 63

A and B

Front 64

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:

Back 64

c. Milling‐in the occlusion

Front 65

65. There are _______ varieties of abrasive paste available for milling operations.

Back 65

2 (one for porcelain teeth , the other for [acrylic?] )

Front 66

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.

Back 66

b, c, a, f, d, e

Front 67

69. T or F:
_____ After remounting a case, if the incisal guidepin does not touch the plate, you should consult the dentist before proceeding.

Back 67

FALSE (Only if the pin is off the plate > 2mm)

Front 68

70. T or F:
_____ The mandibular arch should be the first arch adjusted because the mandibular teeth are almost set on a flat plane.

Back 68

True

Front 69

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.

Back 69

FALSE (A flat aluminum plate should be used, not a glass
plate)

Front 70

72. T or F:
_____ High spots can be reduced by using the edge of an abrasive wheel mounted in a
handpiece.

Back 70

True

Front 71

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

Back 71

True

Front 72

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..

Back 72

b. 320

Front 73

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

Back 73

True

Front 74

76. T or F:
_____ Grinding on Maxillary teeth should be continued until the incisal guide pin touches the plate

Back 74

True

Front 75

77. T or F:
When grinding a high spot, you should zero in on that area until no grinding is required on that spot.

Back 75

FALSE (You should grind a little bit in the spots surrounding the high point to avoid ditching and creation of posterior vertical overlap).