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D2 Fall - Operative III > Inlays and Onlays > Flashcards

Inlays and Onlays Flashcards

1
Q

What are advantages of indirect restorations?

A
  • Esthetics
  • Control of restoration contours
  • Strength of material
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2
Q

What are disadvantages of indirect restorations?

A
  • Expensive
  • Impression Needed (digital or impression material)
  • Requires two appointments (unless you mill in office)
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3
Q

What are indications for inlay?

A
  • Used on teeth with minimal caries
    o Occlusion must be acceptable
    o Buccal and lingual cusps must be STRONG
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4
Q

Does an inlay provide cuspal protection?

A

NO

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5
Q

What are indications for an onlay?

A

Teeth with:
o LARGE carious lesions or existing defective restorations o Cracked teeth
o Endodontically treated teeth
- must have sufficient tooth structure to retain the onlay and allow for removal of undercuts

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6
Q

Inlay or onlay - buccal-lingual width of prep 1/2 way between central groove and cusp tip

A

CONSIDER onlay

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7
Q

Inlay or onlay - buccal-lingual width of prep 2/3 way between central groove and cusp tip

A

SHOULD onlay

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8
Q

Inlay or onlay - undermined cusps after caries removal?

A

Onlay

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9
Q

Inlay or onlay - when occlusion must be altered?

A

Onlay

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10
Q

What are the advantages of gold when used as indirect restorative material?

A
  • strength
  • wear resistance
  • will maintain smooth surface (does not tarnish or
    corrode)
  • better control or contact and contour
  • potential for greater longevity
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11
Q

What are the disadvantages of gold when used as indirect restorative material?

A
  • esthetics
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12
Q

What are the advantages of ceramic when used as indirect restorative material?

A
  • Esthetics
  • Wear resistant
  • Reduced polymerization shrinkage compared to
    direct composite restoration
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13
Q

What are the disadvantages of ceramic when used as indirect restorative material?

A
  • Require removal of more tooth structure for adequate material bulk
  • Ceramics require dry field to bond
  • Expense (compared to direct composite)
  • TECHNIQUE SENSITIVE
  • Wears on opposing dentition
  • Low potential for repair
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14
Q

What are the walls of a gold inlay prep?

A

NO undercuts
Walls are DIVERGENT

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15
Q

How does a restoration fit on a gold inlay?

A

Passively

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16
Q

What are the line angles like on a gold inlay?

A

NO sharp line angles

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17
Q

What is acceptable in a gold inlay if the walls are longer?

A

More divergence acceptable (5°-7°)

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18
Q

What is acceptable in a gold inlay if the walls are shorter?

A

walls should be closer to parallel (2° divergence)

19
Q

What material inlays are beveled?

A

Gold

20
Q

Where are bevels on gold inlays?

A

Occlusal, axiopulpal, gingival bevels
1mm bevel @ 45*

21
Q

What are other characteristics of gold inlay preparations?

A

o Flared exit angles
o Contacts broken at least 0.5 mm
o If 2 surface (MO or DO)
- dovetail is present
- NO reverse S (gold strong enough)

22
Q

What is the occlusal depth of a ceramic inlay?

A

1.5-2mm

23
Q

What is the isthmus of a ceramic inlay prep?

A

2.0 mm

24
Q

Is there a bevel on a ceramic inlay?

A

NO bevel

25
Q

What are other features of a ceramic inlay prep?

A

o Flared exit angles
o Contacts broken at least 0.5 mm o No sharp line angles
o Smooth, flat walls
o If 2 surface (MO or DO)
- dovetail is present

26
Q

How do you do a gold onlay prep?

A
  1. Cut depth cuts into cusps
    - 1.5 mm reduction on functional cusp
    - 1.0 mm reduction on nonfunctional cusp
  2. Add bevels
    - 1 mm functional bevel
    - 0.5 mm non-functional bevel
  3. Ferrule margin (same as light chamfer?)
27
Q

What are specifications of ceramic onlay?

A
  • 2mm reduction functional cusp
  • 1.5 reduction nonfunctional cusp
  • 90 degree cavosurface angles
  • Smooth line angles
  • No external bevels
  • Need adequate (0.5mm) clarence from adjacent
    teeth for die separation
28
Q

Order the ceramic materials used at UMKC from weak to strong

A

Nano resin ceramic< feldspathic porcelain < leucite reinforced < lithium disilicate < zironia
No < Friend < LEts < Lauren < Zyn

29
Q

What are examples of nano resin ceramic?

A

Enamic, lava ultimate

30
Q

What is the MPa of nano resin ceramic?

A

140-200MPa

31
Q

What are examples of feldspathic porcelain?

A

Vita and sirona blocks

32
Q

What is the MPa of feldspathic porcelain?

A

154 +/- 15 MPa

33
Q

What are examples of leucite reinforced?

A

IPS Empress

34
Q

What is the MPa of leucite reinforced?

A

160 MPa

35
Q

What are examples of lithium disilicate?

A

Ivoclar e.max

36
Q

How does ivoclar e.max work?

A

Starts in an intermediate phase and must be crystallized

37
Q

What is the MPa of lithium disilicate?

A

360 MPa

38
Q

What can the shortened firing cycle of Ivoclar e.max cause?

A

Loss of strength and color shift

39
Q

What is the MPa of zirconia?

A

600-900 MPa

40
Q

What are the characteristics of zirconia?

A

Strong, less esthetic

41
Q

What are challenges associated with inlay seating?

A
  • Cannot have any undercuts (walls are DIVERGENT)
  • Restoration fits PASSIVELY
  • NO SHARP LINE ANGLES
42
Q

Vocab hints: TAPER can mean convergence OR divergence (taper means “a gradual narrowing”, but not specific to which direction gets narrower)

A
43
Q

Vocab hints: porcelain and ceramic will be used interchangeably on this exam (porcelain is a type of ceramic)

A

D2 Fall - Operative III (11 decks)

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