Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Op IV final > Sweep 1 > Flashcards

Sweep 1 Flashcards

1
Q

Inlay

• Step 3: Taper all walls

A

2-5 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Primary retention features

of inlays are:

A

• The walls of isthmus and box

short walls-minimal taper long (tall) walls - more taper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Primary resistance form of inlays are:

A
  • Dovetail (2 surface inlay); box forms - Rounded internal line angles
  • Adequate cusp thickness and
    dentin support
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

2/3rds cusp tip the cutoff for

A

inlay vs onlay.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Secondary flare is

A

40degrees at margin. You need to be able to burnish every margin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Cast metal inlay

Step 6: Gingival bevel

A

(0.5-1.0mm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Gingival retraction cord –

A

• widen sulcus
(0.5mm)
• improve visibility
to bevel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Function of the Gingival Bevel

A

Increases strength of enamel • Improves margin seal

• Burnishability of margins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Cast Metal Inlay – Gingival bevel

——– marginal metal

A

30- degree

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Cast metal inaly- occlusal bevel

A

40 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Cast metal inlay

steep cusps =

A

no bevel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Additional retention

A

When opposing walls (primary retention) are short
– Dovetails (2 surface inlay e.g. MO inlay) – Grooves
– Slots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Two Surface Inlays additional retention

Grooves

A

(0.3 mm deep) – sound dentin close to DEJ
– Adds to wall area
– Resists lateral

Grooves DO NOT cross DEJ!!!!!!!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Grooves preferable to

A

slots/wells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Slots or wells

A

–Help drive inlay toward axial during seating

– 2° resistance form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Gingival seat

A

–Help drive inlay toward axial during seating

–2° resistance form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Inlay -Cavosurface exit angle

A

90°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Aesthetic inlays

-Greater taper than cast metal

A

6-10°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Provisional for veneer:

A

2mm circle of enamel
35% - 37% phosphoric acid
No adhesive used Keep clean and dry

Add material to ESF, make sure they are all connected and trim intraorally.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Veneers from lab are usually

A

etched. Look at intaglio surface - should be frosty.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

VENEER CEMENTATION PREPARING THE VENEER

A

Apply silane agent

• Silane acts as a coupling agent – forms a chemical bond that increases bond strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The primary source of retention with a porcelain veneer is \

A

mechanical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

• Silanes help resin

A

wet the entire surface and form a chemical bond

24
Q

Always clean up towards

A

gingiva, not incisally

25
Q

Place first veneer on the tooth and

A

vibrate (carefully and lightly) into position with a blunt instrument or light finger pressure

26
Q

Deeper preparations can result in

A

thicker porcelain
Extra die spacer during fabrication
More opacity in the ceramic to mask discoloration

27
Q

Light cured resin cement is recommended for veneers because of:

A
  • the longer working time - thinner ceramics
28
Q

Use dual cured for:

A
  • thicker ceramic restorations like crowns, inlays and onlays with limited light penetration
29
Q

Veneer

Try-in Paste

A

– Water soluble
– Matches cement
– Optical contact

30
Q

Veneer repair

A

Roughen the damaged margins of the veneer and tooth with fine diamond
Bevel or chamfer the veneer edges
Chairside Microetching (sandblasting) can also be effective

31
Q

Veneer repairs;

If the veneer is ceramic, the borders of the ceramic should be

A

etched with HF acid and rinsed thoroughly

For composites, this step is not necessary

32
Q

Veneer repairs

Composite veneer:

A

Adhesive is applied to the composite veneer edges and the tooth prior to composite addition.

33
Q

Veneer repairs

For ceramic veneers:

A

the etched porcelain margins should be silanated before application of the adhesive and composite for the repair

34
Q

Beaching
Non-vital (walking bleach) – potential problems
There is a small chance

A

(1%) that internal bleaching can lead to root resorption

35
Q

Chemo-mechanical abrasion

A

6.6% HCl slurry –silicon carbide microparticles

36
Q

Smoothing sharp edges can

A

reduce chance of fractures

37
Q

Mandibular anterior veneers

A

More difficult to get adequate room
• Can accelerate wear of opposing
• In many cases they are not visible

38
Q

Indirect Porcelain Laminate Veneers

Advantages

A

– Laboratory controls contours
– Appearance stable over time
– Biomemetic (like the enamel they replace)
– Veneering multiple teeth
– Indirect veneers typically last much longer (evidence weak

39
Q

Window preparation

A

For teeth that require no shape modification – no incisal wear present

40
Q

Incisal lapping preparation

For teeth that

A

have extensive incisal wear and need considerable lengthening. Adds F-L retention form

41
Q

Butt-joint incisal preparation

A

For most teeth that need some insical modification due to wear

42
Q

No Prep Veneers

A

Teeth are inherently under-contoured,
• Interdental spaces present
• Open incisal embrasures are present, or when both conditions exist.

43
Q

Singlecycleoverload

A

– “unexpectedly bit on cherry pit or bone” (rare

44
Q

Cracks typically originate at

A

stress concentration areas

Internal line angles

45
Q

Clinical Tip: If one cusp is fractured, check

A

the other cusp for fracture line!

46
Q

Incidence of fracture in vital posterior teeth

A

70/1000 (Bader 2001)

47
Q

Fracture;

– Endo tx post teeth:

A

50-60% fracture MOD @ 7 yrs

48
Q

Feldspathic porcelain

A

(Older material, weaker, potential to fracture)

49
Q

 Pressed Glass-Ceramics

A

(Dicor, IPS Empress, etc) requires impression and wax pattern)

50
Q

 Lithium Disilicate

A

(IPS e.max press; IPS e.max CAD)

51
Q

 CAD/CAM

A

(Leucite-reinforced Glass Ceramics) (IPS Empress, Paradigm C), Feldspathic Glass (CEREC Blocs, Vitablocs Mark II), IPS e.max, Zirconia)

52
Q

 Laboratory processed Composite Restorations

A

(CAD/CAM Paradigm MZ100, Lava Ultimate 3M)

53
Q

Replacing and Protecting Cusps Missing cusps\Fractured cusps

A

Box extension Flat gingival floor Retain axial wall

54
Q

Rule of thumb:

A

greater than 1/2 (2/3) the inter-cuspal distance

55
Q

Cast metal onlay

Functionalcuspreduction –

A

1.5mm

– Multi-planar

56
Q

Cast Metal Onlay Non- Functional cusp

• Non-functionalcusp reduction

A

– 1.0 mm

– Multi-planar

57
Q

Aesthetic onlays

Non-functional cusps

A

1.5mm

Op IV final (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions