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Fixed 3 > E1 > Flashcards

E1 Flashcards

1
Q

Supragingival margin

A

Easily finished
Plaque free
Easier impression
Easier evaluation

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2
Q

Subgingival margin

A 
Esthetic
Associated with RPD
Root sensitivity 
Additional retention needed
Proximal contact area extends to gingival crest
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3
Q

Retraction cord should be able to be below

A

Your margin without destroying the attached gingival connection

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4
Q

Adequate reduction for

A

Tooth contours

Resist deformation

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5
Q

Short the tooth the ____ taper

A

Less

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6
Q

The bigger the tooth

A

The more retention the more surface area

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7
Q

Sloped shoulder advantages

A

No metal collar

Less intrusion on gingival crevice

Simple lab construction

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8
Q

Sloped should disadvantages

A

More difficult

Greater marginal creep

Rough marginal area

Potential gray line

Lab tends to over contour

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9
Q

Shoulder Advantages

A

Optimism esthetics

Glazed porcelain at margin=less plaque

Margin need not be buried in crevice

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10
Q

Porcelain butt margin absolute indications

A

Minimal sulcus depth of 1 mm or less

Thin labial tissue

High smile line

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11
Q

Porcelain butt margin real indications

A

Margins in esthetic zone

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12
Q

Shoulder disadvantage

A

Higher lab cost

More difficult lab procedure

More difficult preparation

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13
Q

Ante’s law

A

Unwise to provide FPD when the root surface fare of the root of the abutment was less than the root surface area of the teeth being replaced

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14
Q

Horizontal bone loss can be

A

Deceptive

-a little can result in considerable loss of bone support

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15
Q

Retention has to be extended at a similar Distance from the axis of the primary abutment to the

A

distance of the lever arm that the Pontic exerts

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16
Q

Ceramic

A

Product made from a nonmetallic inorganic material processed by firing at high temperature to achieve diesrable properties

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17
Q

What dental ceramic group is used for denture teeth and porcelain jacket crown

A

High fusion

Medium fusion

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18
Q

What dental ceramic group is used for metal ceramic crowns

A

Low fusion

Ultra low fusion

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19
Q

Feldspar

A

A naturally occurring glass that contains silica fluxes and alumina all neatly bound together

Binds all 3 clay bodies together once its been fused

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20
Q

Dental porcelain compostion

A

Feldspar

Quartz

Other oxides

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21
Q

Dental porcelain are heated at high temps and then ______ which causes _____

A

Cooled rapidly

The glassy matrix to fracture into many small fragments causing what is called a Frit

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22
Q

Vitrification

A

Turing crystalline silic along with associated fluxes and modifiers into glass

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23
Q

Porcelain can be defines as a highly _______

A

Vitrified ceramic body

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24
Q

A ceramic body includes both a ______ structure as well as _____ which is infiltrated between the particles

A

Refractory skeletal structure

Feldspathic glass

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25
Q

Refractory skeletal structure retains it shape though ______ and _____

A

Sintering

Fusing process

26
Q

Porcelain is not simply a form of glass it is

A

Glass with a refractory internal structure

27
Q

Opaque porcelain

A

Contains opcifying oxides

28
Q

Body or dentin porcelain

A

Is translucent and contains metallic oxides that give the shade or base color selected

29
Q

Incisal or enamel porcelain is

A

More translucent than the body

30
Q

Different porcelain powders are mixed with

A

A water based glycerin containing liquid to form a a paste

31
Q

Porcelain shrinkage

A

30%?

32
Q

Shimstock

A

.015 mm

33
Q

Accu film articulating paper

A

.017 mm

34
Q

Porcelain labial margin fribraction 3 ways

A

Platinum foil matrix technique

Porcelain wax technique

Direct lift technique

35
Q

Direct Lift Technique

A

Apply shoulder porcelain on margin and dry with tissue paper and brush excess with large brush

36
Q

Direct lift Advantage

A

Least time consuming

37
Q

Direct lift disadvantages

A

Shoulder porcelain needed

Slightly rough margins

38
Q

Framework Design goals

A

Even thickness of porcelain

Proper porcelain metal interface

Good connector design

Optimally placed occlusal contacts

39
Q

Glass will adhere to Clean gas free metal if

A

covered with adherent oxide and tempered raised where oxide is partially dissolves into glass

40
Q

Adhesive failure at porcelain metal interface

A

Oxide layer missing

41
Q

Adhesive failure at metal oxide metal interface

A

contaminated metal

42
Q

Adhesive failure at porcelain metal oxide interface

A

Contaminated metal oxide

43
Q

Cohesive failure in porcelain

A

Maxim strenght

44
Q

Cohesive failure in metal oxide

A

Excessive oxidation

45
Q

Cohesive failur in metal

A

Doesn’t happen

46
Q

____ mm from junction of excursive path

A

1.5

47
Q

It is preferred to have opposing ________ contact metal

A

Natural tooth

48
Q

centric stops should be located ____ from the metal ceramic junction to prevent ____

A

1.5 mm

Porcelain fracture from deformation of the metal

49
Q

If the vertical overlap must be minimal then

A

Ceramic against ceramic will produce the least wear

50
Q

Metal extended to incisal edge for metal fleuxre will cause

A

Porcelain fracture

51
Q

Connector size

A

2.5 x 2.5

52
Q

Attachments should be surrounded by at least ____ of metal to prevent ______ in Function

A

1 mm

Flexure

53
Q

Porcelain is strong in ____ and weak in

A

Compression

Tension

54
Q

Porcelain poor tension means

A

Bad shear

55
Q

Porcelain metal junction should be

A

A butt joint of 90 degrees or greater

56
Q

The coping must be approximately _____thick

A

.5 mm

But Mary be thicker to support porcelain

57
Q

Where can interporximal contact be

A

Metal or porcelain

58
Q

Casting margins

A

10 micrometers

59
Q

Porcelain margins

A

50 micrometers

60
Q

Least conservative prep

A

Mcc

61
Q

Metal ceramics appearance can be improved by

A

Omitting metal shoulder and replacing with porcelain

Fixed 3 (2 decks)

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