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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
Shrinkage of gingival tissue
Ischemia
26
why would cord have metal filaments
maintain intrasulcular position
27
how fast does the sulcus close after cord removal
30 seconds (fast)
28
what to avoid when using astringent
low pH can affect the preped tooth a lot (smear layer and demineralization)
29
what do you do if you place the cord in dry
GEt it wet to avoid tearing when it is removed
30
where is the best place to first place the cord
In the interproximal areas
31
why might it be hard to place cord
Ginvial inflammation (bleeds easy, swollen)
32
How do you know you have the correct amount of cord
See the margin circumferentially | uninterrupted cord with no soft tisssue folded over it
33
sizes of cords for the double cord technique
1st in is small and left in for the impression | 2nd in is larger and removed for impression
34
how to control minor hemorghaging
Astrigent | infiltrating with local anesthetic to adjacent gingival papillae
35
what is the paste made of
Aluminum chloride
36
how is the paste placed
Injected into the dry sulcus with a special gun
37
pros and cons of paste
Pro: less disscomfort and good hemostasis con: less tissue displacment, die trimming more difficult
38
what is electrosurgery
Removing the inner epithelail lininig of the gingival sulcus | uses high current to cause cell death, and ultimitely cuts the gingiva
39
can you use irreveresible hydrocolloid for cast restorations
No, not sufficiently accurate
40
benifit of Polyethers and addition silcones
Sufficient long term dimensional stability
41
what can not be poured in reversible hydrocolloid
epoxy or electroplated | need to be poured emiadly
42
Pros of reversible hydrcolloid
``` excellend dimenstional accuracy acceptable surface detail hydrophilic ( good for moisture problems) long working time good cost no custom tray ```
43
cons of reversible hydrocolloid
pour immediately changes from gel to sol at high temp low tear resitsance lack dimenstional stabilisy
44
what is needed to do a reversible hydrocolloid impression
water cooled impression trays
45
types of reversible hydrocolloids
heavy body tray | viscous syringe material
46
how to help with dimensional changes in reversible hydrocolloids
thick as possible to increase volume to surface area
47
Pros of polysulfides
high tear strength | easier to pour that others
48
cons of polysulfides
messy unpleasant odor long setting time stains clothes brown due to lead
49
when should polysulfides be poured
right after impression despite better dimensional stability
50
what tray is used with polysulfides and why
Custom to minimize bulk therefore reducing contraction
51
pros of condension silicone
pleasant to use | short setting
52
cons of condension silicone
hydrophobic Poor wetting low stability
53
what was deveoped to overcome polysulfide disadvantages
Condensation silicone
54
do patients prefer condensation silicone or polysulfides
Condensastion silicone due to its short time
55
how to take a condesation silicone impression
heavy filled putted material to customize stock impression try thin wash of light bodied is squirted in to make impresssion
56
pros of polyethers
``` dimension stability (no volitle product produced Accuracy automix available lasts a long time ```
57
cons of polysethers
set material very stiff- can break casts imbition short working time allergies
58
how does polyether set
Using a polymerization reaction
59
pros of Addition silicone
``` Dimensional stability Pleasantto use Short setting time Automix Avaible less ridged thanpolyether and stiffer than polysulfide ```
60
Cons of Addition silicone
Hydrophobic Poor setting some materials release H2 Hydrophilic formulation imbibe moisture
61
other name for addiition silicone
Poly(vinyl Siloxane)
62
benifit of adidition silicone over condensation silicone
Much better dimensional stability
63
when not to use spray on adhesoin for trays
Polyvinylsilozane
64
benfit of a custom tray
good for elastomeric impresion by limiting volume of material - reduce stress during removal and thermal contract
65
why don't use a custom tray in hydrocoloids
dimensional change by water loss so you want bulk
66
how thick should custom trays be to get ridigd
2-3 mm
67
what do you need for doing elastomeric material impressions
Assistant or auto mix technique
68
what to do with displacment cord when doing an impression
remove right before placing th etray
69
what todo with light body
squirt it all over the prep at the distal but keep as thin as possible cuz it shrinks more than heavy body
70
what is the automix tequire
the squirter thing we use in class
71
when is a triple tray used
popular for making impressions for single unit and less expensive restorations made to conform to the existing occlusion
72
what is done to make a tripple tray
maximum intercuspation | high viscosity polyether or polyvinvylsiloxane supported by a thin mesh frame
73
what is the definitive cast
the master or working cast that is the replica of the preped teeth, ridge areas, and other parts of the dental arch
74
what is the die
positive reprodcution of the preped tooth of suitable hard substance with correct accuracy
75
can a cast and die contain more info than the impression
No
76
what are two important qualties of cast and die materials
dimensional accuracy and reistance to abrasion while wax pattern is formed
77
what makes different kinds of dental stone different
Different levels of calcification
78
what should you do if you need to soak gypsum
soak in water saturated with gypsum as to not dimminish surface detail
79
why use resin to make a die
To increase the low strength and abrasion resistance of die stone
80
how does electroplatting work
Coat of pure silver or copper on impression then filled with stone
81
why use flexible die materials
Interum restorations
82
what are the 2 pours for a die
1 to form the tooth | 2nd to form the base
83
how are diagnostic casts best mounted
In cr
84
how should definitive casts be made
At Maximum intercuspation of unpreped teeth
85
why do reorganize occlusion
If there is some pathological problem with occlusion to begin with and will the patient benifit
86
why do Conformative occlusion
To maintain current occlusion patterns even if it is not the correct occlusion pattern
87
when to do conformative occlusion
when patient has only 1 or 2 crowns
88
how should the intended metal-ceramic junction look
should be as definite(90 degrees) as possible and smooth
89
how to remove investment for a MCC
using an airborn particle abrasion or steam
90
how to remove the oxide layer from MCC
acid or air abraishioin
91
why thin the margin to a knife edge
make sure margin isn't visible
92
what is made on the metal layer for creating the bond between metal and porcelain
oxide layer for the chemical bond by using a firing tray
93
what is dental porcelain made from
Quartz Feldspar other oxides
94
what does body porcelain do
Translucency and oxides that aid in shade matching

fixed 2 (8 decks)

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