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Fixed Prosthodontics III > Quiz 1 Review > Flashcards

Quiz 1 Review Flashcards

1
Q

what are some issues with bonding zirconia crowns?

A
  • if you have to remove the bonded zirconia crown, you have to grind it down as if you were doing a prep on enamel
  • you should only bond zirconia crowns if there are no other retentive features because they are just too difficult to retrieve
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2
Q

T or F:

bonded zirconia is too durable for many dental applications

A

true

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3
Q

what is a drawback to urethane dimethacrylate (triad putty)?

A

it is a viscous material and therefore doesn’t flow as much, meaning it will not get the same fine detail that bisacryl would

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4
Q

do pressed or milled restorations adapt better to preps?

A

pressed

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5
Q

what is the typical working distance for most operators?

A

14-16 inches

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6
Q

T or F:

since sit-down dentistry was pioneered, lower back disorder incidences have decreased

A

false

they have NOT decreased

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7
Q

what are some things that contribute to work related musculoskeletal disorders?

A
  • static posture
  • poor posture
  • repetitive motion
  • excessive forces
  • grasping small instruments for long periods of time
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8
Q

does alternating between sitting and standing contribute to work related musculoskeletal disorders?

A

no, in other words it is helpful to alternate sitting and standing

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9
Q

T or F:

prevention of WRMDs involves diverging from the neutral seated position as little as possible

A

true

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10
Q

T or F:

prevention of WRMDs involves keeping instruments sharp and using them a lot

A

false

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11
Q

T or F:

prevention of WRMDs involves strengthening and maintaining core muscles

A

true

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12
Q

T or F:

prevention of WRMDs involves increasing appointment times for difficult procedures and/or difficult patients

A

true

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13
Q

what is the minimum occlusal clearance for a ceramic onlay?

A

2mm

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14
Q

where should the functional cusp shoulder be placed on a ceramic onlay?

A

middle third

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15
Q

what is the absolute minimum enamel requirement for a ceramic onlay?

A

some on the buccal and some on the lingual

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16
Q

what is the best application for ceramic onlays?

A

if you have small buccal/lingual cusps and you must remove most of the cusps during the prep, you should consider doing a ceramic onlay

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17
Q

what are 3 things that jeopardize long term success of all ceramic onlays?

A
  • under-reduction
  • sharp line angles
  • poor bonding technique
18
Q

what is the diameter of the tip of the flat-ended diamond?

A

0.3mm (also ideal shoulder width for all ceramic onlays)

19
Q

what are the similarities between gold/metallic onlays and all-ceramic onlays?

A
  • pretty much just the box and isthmus form
  • differences: occlusal reduction (more for all-ceramic), axial reduction (more for gold/metallic), presence of a bevel (not needed for all-ceramic)
20
Q

when doing a ceramic onlay, what do you have to ensure you do at the bonding appointment?

A

have really good moisture control

21
Q

what are 3 contraindications for ceramic onlays?

A
  • subgingival prep
  • uncontrolled periodontal disease
  • major salivators (consider using an anti-sialogogue)
22
Q

can you put ceramic onlays on endodontically treated teeth?

A

yes

23
Q

can you put a ceramic onlay on a tooth with a cuspal fracture?

A

yes

24
Q

temporaries we make for all ceramic onlays have to be compatible with ___ and secured to the tooth with ___

A
  • bis-GMA

- flowable and bonding agent

25
Q

can both milled and pressed restorations be bonded or cemented?

A

yes

whereas an onlay must be bonded

26
Q

do pressed or milled restorations have more limitations in their esthetic potential?

A

pressed, because they are made from monochromatic pressable ingots

27
Q

do milled or waxed-and-pressed restorations fit better?

A
  • depends on how well the margin of the preparation is refined and captured
  • burs used in milling restorations are not small enough to accommodate minor discrepancies, so if the margin is less than ideal, then waxed-and-pressed restorations will fit better
28
Q

do pressed or milled ceramic restorations require a temporary?

A

only pressed, whereas milled ceramic restorations can allow bypass of the temporary phase

29
Q

T or F:
securing an all-ceramic partial-coverage temporary is the same process as securing a temporary to a preparation designed for luting

A

false

30
Q

is it always beneficial to bypass the temporary phase?

A

no

31
Q

list the following in order of more vitreous to more crystalline: pressable ceramics, zirconia, feldspathic porcelain

A
  1. feldspathic porcelain
  2. pressable ceramics
  3. zirconia
32
Q

glassy/vitreous vs crystalline:

which has better optical properties?

A

glassy/vitreous

33
Q

glassy/vitreous vs crystalline:

which has more strength?

A

crystalline

34
Q

glassy/vitreous vs crystalline:

which has less strength?

A

glassy/vitreous

35
Q

glassy/vitreous vs crystalline:

which has less resistance to crack propagation?

A

glassy/vitreous

36
Q

glassy/vitreous vs crystalline:

which has better mechanical properties?

A

crystalline

37
Q

glassy/vitreous vs crystalline:

which has more resistance to crack propataion?

A

crystalline

38
Q

glassy/vitreous vs crystalline:

which is more ordered in structure?

A

crystalline

39
Q

glassy/vitreous vs crystalline:

which is less ordered in structure?

A

glassy/vitreous

40
Q

glassy/vitreous vs crystalline:

which is more opaque?

A

crystalline

41
Q

glassy/vitreous vs crystalline:

which is more translucent?

A

glassy/vitreous

Fixed Prosthodontics III (4 decks)

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