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Fixed Prosthodontics II > Final Exam > Flashcards

Final Exam Flashcards

1
Q

where do tapered posts transfer stress to teeth?

A

coronal

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2
Q

where do parallel posts transfer stress to teeth?

A

apical

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3
Q

a cast, post, and core is indicated on a tooth with how much of the coronal tooth structure missing?

A

more than 1/2

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4
Q

would you ever do a prefabricated post if you have less than 1/4 coronal tooth structure left?

A
  • no
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5
Q

what affect does texture of the intaglio surface have on retention?

A

roughened intaglio surface improves retention

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6
Q

what affect does a roughened tooth preparation have on retention?

A

no affect

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7
Q

is it critical for the arches to be parallel when using a monotrack articulator? what angle do you NOT want the arches to be and why?

A
  • no
  • you don’t want the arches to converge because it makes it harder to trim and harder to index
  • better to have the arches diverge
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8
Q

cuspal fractures are more common in what type of restoration?

A

direct fillings

uncommon with indirect gold onlays

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9
Q

what are the symptoms of fractured tooth syndrome? what is the caveat?

A
  • cold and pressure sensitivity
  • inconsistency with symptoms if the caveat
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10
Q

where can cracks form as a result of a direct filling?

A

at the base of the isthmus or box, mostly at 45 degree angles but that can vary

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11
Q

T or F:

incomplete cracks will show symptoms on bite and release, as well as heat sensitivity

A

false

they WILL show symptoms on bite and release (pressure), but are cold sensitive (NOT hot)

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12
Q

how can you clinically test if a tooth has a crack?

A
  • use a tooth sleuth to test each cusp
  • if one cusp produces pain but the others don’t, you know you have a crack
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13
Q

how should you use a tooth sleuth to test for cracks?

A
  • you want to start on a tooth that is somewhat far away from the tooth that the patient indicates is causing them pain, then get progressively closer to the offending tooth
  • place the tooth sleuth on the cusp of the tooth you are testing, have the patient bite and release, and record the patients response
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14
Q

what is the treatment for a fracture or incomplete fracture?

A

some kind of coverage, typically a crown, but it does not need to be completed right away - depends on patient preference, finances, and whether or not it is bothering the patient

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15
Q

fractured teeth are not always consistent in terms of symptoms. what can inconsistency be related to?

A

can be related to occlusion

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16
Q

what can you do if there are occlusion problems relating to inconsistency of symptoms of a fractured tooth?

A

you can adjust the bite and take the tooth out of occlusion to alleviate symptoms until treatment can be performed, but you must inform the patient of what you are doing, and that it is only a temporary fix

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17
Q

what cusps are fractures more common on?

A

non-functional cusps (maxillary buccal cusps and mandibular lingual cusps)

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18
Q

what is the treatment for a crack that is in the enamel only or is very shallow in the dentin and is asymptomatic?

A

you may not have to do any treatment at all

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19
Q

once you start the process where you’ve invested your wax pattern, put it in the oven, wax is burned out and you start the casting process, can you interrupt that (cool down the mold and reheat it)?

A

no because the material breaks down

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20
Q

what affect does palladium have on the color of gold?

A

it turns it into white gold

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21
Q

what does copper do to the color of gold?

A

makes it more yellow

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22
Q

with a broken arm casting machine, why do we have to place the margins of the wax pattern to the right (clockwise)?

A

the flow of material is in a clockwise direction and it throws the material towards the margins

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23
Q

when an exising crown comes off of a tooth, it fails. where is the most common failure interface?

A

intaglio surface of the crown-cement interface

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24
Q

what are the 3 types of resin cements?

A
  • self adhesive
  • adhesive
  • esthetic
25
Q

what is the name of the self adhesive resin cement used at the UUSOD?

A

reliex unicem

26
Q

how does self adhesive resin cement set?

A

chemically (on its own)

27
Q

what does light curing do to self-adhesive resin cement?

A

even though self-adhesive resin cement sets chemically, light enhances the polymerization linkage, with increases the compressive strength

28
Q

what are the two most important properties of cements, and what is the benefit of these properties?

A
  • increased compressive strength
  • increased elastic modulus
  • these properties improve the ability of indirect restorations to stay on the tooth
29
Q

what is the purpose of die spacer?

A
  • creates a space for the luting/bonding agent
  • helps eliminate some of the error points in the occlusal surface
30
Q

what are the most common permanent tooth that is lost first?

A

mandibular first molars, partly because they are the first to erupt

31
Q

what is a result of loss of the permanent mandibular first molars?

A

collapse

  • mesial drift of mandibular second molar and supra-eruption of maxillary first molar
32
Q

what is an issue you might run into when trying to restore a mandibular second molar when the patient has collapse as a result of loss of the mandibular first molar?

A

collapse can cause the mandibular second molar to undergo mesial drift, putting it off axis. this makes it harder to prepare and you have a higher risk of hitting the pulp horns

33
Q

if collapse has occurred as a result of loss of the mandibular first molar, what are some ways you can address the mesial drift of the mandibular second molar and supra-eruption of the maxillary first molar?

A
  • consider orthodontically uprighting the mandibular second molar
  • can put a bridge in, but you could have occlusal and excursive issues
  • you might have to endodontically treat the upper first molar and reduce it to restore the line and plane of occlusion
34
Q

what are two limitations of double bite trays?

A

no contralateral information, like canine guidance

35
Q

what are the advantages to double bite trays?

A

they give you a very accurate bite, proximal surfaces, occlusion, and prepped tooth

36
Q

what are two metals in casting alloys that can be damaging to health?

A

nickel and beryllium

37
Q

what are three things you can add to a full coverage preparation to improve resistance and retention? when would you want to use these?

A
  • grooves, boxes, and isthmus
  • these are helpful if you have a prep that is really short or too tapered
38
Q

what four materials contain glass ionomer? what material is glass ionomer NOT in?

A
  • cement, sealants, buildup, and direct fill restorations
  • NOT in varnishes
39
Q

what is the preferred way to anchor a buildup in an endodontically treated tooth?

A

anchor it in the pulp chamber

40
Q

what cement should you use for a temporary, and what is the chemical reaction that bonds it to the tooth?

A
  • zinc polycarboxylate cement
  • calcium chelation
41
Q

what is the first area you should address when fitting a crown?

A

proximal contact

42
Q

what is the first area you should check when fitting a cast crown?

A

internal margin and intaglio surface

43
Q

what are 3 compensations for morphological deficiencies in a matrix?

A
  • wax
  • light cured restorative material into deficiency
  • carve it out in the putty
44
Q

can you use type 2 inlay wax on things other than indirect inlay restoraitons?

A

yes

45
Q

what is the function of the sprue and reservoir?

A

keeps metal molten longer

46
Q

how does quenching make the metal more malleable?

A

it makes the grain structure less ordered

47
Q

what are some uses of cotton rolls?

A

retraction, keeps things dry, catches debris, they are cheap

48
Q

what are some things that can interfere with the ability to remove a wax pattern from the die?

A
  • no die lube, or waxing over many days without reapplying die lube
  • flash beyond the margins
  • prep is undercut
49
Q

what is the difference between centric relation and centric occlusion (maximum intercuspation)?

A

centric relation is a jaw relation position and centric occlusion (maximum intercuspation) is a tooth position (tooth to tooth)

50
Q

can you determine/examine centric relation with a dual arch bite tray?

A

no

51
Q

can you do a full diagnostic wax up or open the bite on a dual arch impression?

A

no

52
Q

what is the advantage of a full arch impression taken and mounted with a facebow on a semi adjustable articulator?

A

you will get a reasonable (not necessarily perfect) reproduction of the patient

53
Q

why don’t we use anything with glass ionomer in it to cement a post?

A

glass ionomer expands

54
Q

what is the difference between internal and external axial wall taper?

A
  • internal - walls of the isthmus/box
  • external - outer walls of the tooth
55
Q

what does the occlusal offset on a 7/8 crown do?

A

it increases strength and creates a staple affect

56
Q

can you directly finish gold on a tooth?

A

yes

57
Q

does the tensile strength of cement have any affect on resistance/retention?

A

no - only compressive strength and elastic modulus do

58
Q

what can improve resistance and retention on a cast post and core?

A

ferrule

59
Q

what is the minimum height for an affective ferrule?

A

2mm

Fixed Prosthodontics II (4 decks)

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