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readings Flashcards

1
Q

is the MCC considered to be conservative

A

No

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2
Q

what was an inital problem with MCC

A

Finding a way to bond metal and ceramic

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3
Q

what are the charcteristics of the metal in a MCC

A

higher fusing range

Lower thermal expansion

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4
Q

Indications for MCC

A

need complete coverative esthetics
need for use in fixed dental prosthetics
similar to cast metal crowns

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5
Q

why can MCC be used in fixed dental prosthetics

A

because it can be a retainer due to its metal substrat to be cast or solfered connected
similar to cast metal crowns

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6
Q

MCC contraindications

A

active caries
untreat perio disease
large pulp cambers
when a more conservative restoration is better

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7
Q

can an MCC have a brittle fracture

A

Yes, because of ceramics

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8
Q

is the MCC expensive

A

yes

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9
Q

what is important for an impression to get

A
  • sufficient unpreparaed tooth structure immediately adjacent to the margin for the dentist and lab to identify contour of the tooth and all prepared surface
  • need to know contour
  • all teeth in arch
  • immediate soft tissue surrounding the prep
  • lingual surface of anterior teeth (lingual guidance)
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10
Q

why is it hard to get a good impression

A

wet (gives voids)

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11
Q

are elastomeric impression hyrophilic or phobic

A

Phobic except for polyethrers

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12
Q

what must be done if you go subgingivally

A

move gingiva using mech, chem, and surgical means without jeopardizing perio health

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13
Q

what can lead to permanent soft tissue damage

A

improper manipulation of impression

poor tissue displacement technique

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14
Q

probem with bad interums( bad contour, polished poorly, bad margin, plaque retention)

A

if you injury soft tissue, it won’t be able to heal properly

- inflammation

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15
Q

can you do fixed with perio disease

A

No, perio should be solved first

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16
Q

what do you do if the fixed restoration is done before you and causes perio problems

A

Place an interum, fix perio, then new crown

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17
Q

how to control saliva in the maxillary arch

A

cotton roll in vestibule buccal to prep

saliva evacuator on the lingual

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18
Q

what happens when part of the cotton roll is saturated

A

Entire roll must be replaced

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19
Q

how do you control the tongue on the mandible

A

flange type evacuator using cotton rolls to minimize discomfort between the mylohyoid ridge of the alvelar prosses

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20
Q

anesthetics effect on saliva

A

slows saliva cuz pdl nerve impulses lead to saliva flow

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21
Q

drugs to control saliva

A

Anti-cholinergics (rarely used

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22
Q

what is used for mechanical displacement of gingiva

A

chord
also paste system in conjucntion with directed pressure
chem (aluminum sulfate and epinephrine) shrink the tissue)
cutting sergically

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23
Q

what type of cord is used to displace gingiva

A

Non-impregnated cord

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24
Q

what does the cord do

A

stretches the circumferential PDF

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25
Q

Shrinkage of gingival tissue

A

Ischemia

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26
Q

why would cord have metal filaments

A

maintain intrasulcular position

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27
Q

how fast does the sulcus close after cord removal

A

30 seconds (fast)

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28
Q

what to avoid when using astringent

A

low pH can affect the preped tooth a lot (smear layer and demineralization)

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29
Q

what do you do if you place the cord in dry

A

GEt it wet to avoid tearing when it is removed

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30
Q

where is the best place to first place the cord

A

In the interproximal areas

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31
Q

why might it be hard to place cord

A

Ginvial inflammation (bleeds easy, swollen)

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32
Q

How do you know you have the correct amount of cord

A

See the margin circumferentially

uninterrupted cord with no soft tisssue folded over it

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33
Q

sizes of cords for the double cord technique

A

1st in is small and left in for the impression

2nd in is larger and removed for impression

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34
Q

how to control minor hemorghaging

A

Astrigent

infiltrating with local anesthetic to adjacent gingival papillae

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35
Q

what is the paste made of

A

Aluminum chloride

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36
Q

how is the paste placed

A

Injected into the dry sulcus with a special gun

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37
Q

pros and cons of paste

A

Pro: less disscomfort and good hemostasis
con: less tissue displacment, die trimming more difficult

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38
Q

what is electrosurgery

A

Removing the inner epithelail lininig of the gingival sulcus

uses high current to cause cell death, and ultimitely cuts the gingiva

39
Q

can you use irreveresible hydrocolloid for cast restorations

A

No, not sufficiently accurate

40
Q

benifit of Polyethers and addition silcones

A

Sufficient long term dimensional stability

41
Q

what can not be poured in reversible hydrocolloid

A

epoxy or electroplated

need to be poured emiadly

42
Q

Pros of reversible hydrcolloid

A 
excellend dimenstional accuracy
acceptable surface detail
hydrophilic ( good for moisture problems)
long working time
good cost
 no custom tray
43
Q

cons of reversible hydrocolloid

A

pour immediately
changes from gel to sol at high temp
low tear resitsance
lack dimenstional stabilisy

44
Q

what is needed to do a reversible hydrocolloid impression

A

water cooled impression trays

45
Q

types of reversible hydrocolloids

A

heavy body tray

viscous syringe material

46
Q

how to help with dimensional changes in reversible hydrocolloids

A

thick as possible to increase volume to surface area

47
Q

Pros of polysulfides

A

high tear strength

easier to pour that others

48
Q

cons of polysulfides

A

messy
unpleasant odor
long setting time
stains clothes brown due to lead

49
Q

when should polysulfides be poured

A

right after impression despite better dimensional stability

50
Q

what tray is used with polysulfides and why

A

Custom to minimize bulk therefore reducing contraction

51
Q

pros of condension silicone

A

pleasant to use

short setting

52
Q

cons of condension silicone

A

hydrophobic
Poor wetting
low stability

53
Q

what was deveoped to overcome polysulfide disadvantages

A

Condensation silicone

54
Q

do patients prefer condensation silicone or polysulfides

A

Condensastion silicone due to its short time

55
Q

how to take a condesation silicone impression

A

heavy filled putted material to customize stock impression try
thin wash of light bodied is squirted in to make impresssion

56
Q

pros of polyethers

A 
dimension stability (no volitle product produced
Accuracy
automix available
lasts a long time
57
Q

cons of polysethers

A

set material very stiff- can break casts
imbition
short working time
allergies

58
Q

how does polyether set

A

Using a polymerization reaction

59
Q

pros of Addition silicone

A 
Dimensional stability
Pleasantto use
Short setting time
Automix Avaible
less ridged thanpolyether and stiffer than polysulfide
60
Q

Cons of Addition silicone

A

Hydrophobic
Poor setting
some materials release H2
Hydrophilic formulation imbibe moisture

61
Q

other name for addiition silicone

A

Poly(vinyl Siloxane)

62
Q

benifit of adidition silicone over condensation silicone

A

Much better dimensional stability

63
Q

when not to use spray on adhesoin for trays

A

Polyvinylsilozane

64
Q

benfit of a custom tray

A

good for elastomeric impresion by limiting volume of material
- reduce stress during removal and thermal contract

65
Q

why don’t use a custom tray in hydrocoloids

A

dimensional change by water loss so you want bulk

66
Q

how thick should custom trays be to get ridigd

A

2-3 mm

67
Q

what do you need for doing elastomeric material impressions

A

Assistant or auto mix technique

68
Q

what to do with displacment cord when doing an impression

A

remove right before placing th etray

69
Q

what todo with light body

A

squirt it all over the prep at the distal but keep as thin as possible cuz it shrinks more than heavy body

70
Q

what is the automix tequire

A

the squirter thing we use in class

71
Q

when is a triple tray used

A

popular for making impressions for single unit and less expensive restorations made to conform to the existing occlusion

72
Q

what is done to make a tripple tray

A

maximum intercuspation

high viscosity polyether or polyvinvylsiloxane supported by a thin mesh frame

73
Q

what is the definitive cast

A

the master or working cast that is the replica of the preped teeth, ridge areas, and other parts of the dental arch

74
Q

what is the die

A

positive reprodcution of the preped tooth of suitable hard substance with correct accuracy

75
Q

can a cast and die contain more info than the impression

A

No

76
Q

what are two important qualties of cast and die materials

A

dimensional accuracy and reistance to abrasion while wax pattern is formed

77
Q

what makes different kinds of dental stone different

A

Different levels of calcification

78
Q

what should you do if you need to soak gypsum

A

soak in water saturated with gypsum as to not dimminish surface detail

79
Q

why use resin to make a die

A

To increase the low strength and abrasion resistance of die stone

80
Q

how does electroplatting work

A

Coat of pure silver or copper on impression then filled with stone

81
Q

why use flexible die materials

A

Interum restorations

82
Q

what are the 2 pours for a die

A

1 to form the tooth

2nd to form the base

83
Q

how are diagnostic casts best mounted

A

In cr

84
Q

how should definitive casts be made

A

At Maximum intercuspation of unpreped teeth

85
Q

why do reorganize occlusion

A

If there is some pathological problem with occlusion to begin with and will the patient benifit

86
Q

why do Conformative occlusion

A

To maintain current occlusion patterns even if it is not the correct occlusion pattern

87
Q

when to do conformative occlusion

A

when patient has only 1 or 2 crowns

88
Q

how should the intended metal-ceramic junction look

A

should be as definite(90 degrees) as possible and smooth

89
Q

how to remove investment for a MCC

A

using an airborn particle abrasion or steam

90
Q

how to remove the oxide layer from MCC

A

acid or air abraishioin

91
Q

why thin the margin to a knife edge

A

make sure margin isn’t visible

92
Q

what is made on the metal layer for creating the bond between metal and porcelain

A

oxide layer for the chemical bond by using a firing tray

93
Q

what is dental porcelain made from

A

Quartz
Feldspar
other oxides

94
Q

what does body porcelain do

A

Translucency and oxides that aid in shade matching

fixed 2 (8 decks)

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