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Fixed Prosthodontics > Posterior Crown Preparations > Flashcards

Posterior Crown Preparations Flashcards

1
Q

What are the functions of posterior crowns?

A

Maintenance of existing tooth structure, maintenance of occlusion, mastication, and aesthetics

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2
Q

What are posterior all ceramic crowns made of?

A

Amber Mill

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3
Q

What preparation is required for posterior all ceramic crowns?

A

Minimal preparation required

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4
Q

What is Amber Mill?

A

Lithium disilicate milled blocks

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5
Q

What are the properties of Amber Mill?

A

Relatively strong, digital milling high fit accuracy, good longevity durable, bio-inert, good aesthetics, and can be used anteriorly

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6
Q

What is the section of Amber Mill at margins?

A

Thin 0.3-1mm section

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7
Q

What is the definition of milled?

A

Reduced to fine particles by grinding in a mill

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8
Q

What are the new all ceramic crowns at dental hospital?

A

Table tip, thin veneer, veneer, anterior crown, inlays, onlays, partial crown, and posterior crown

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9
Q

What are posterior metal ceramic crowns made of?

A

Co Cr base layer with ceramic overlay (previous presentation) cast/digitally printed

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10
Q

What are the properties of Co Cr base layer with ceramic overlay?

A

Relatively strong, good longevity durable, bio-inert, and good aesthetics

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11
Q

What preparation is required for posterior metal ceramic crowns in functional cusp area?

A

Heavier preparation required 2mm

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12
Q

What is the functional cusp in maxillary arch?

A

Palatal cusp

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13
Q

What is the functional cusp in the mandibular arch?

A

Buccal cusp

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14
Q

What are the old style posterior metal ceramic crowns?

A

Porcelain fused to metal crowns

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15
Q

What are the modern posterior metal ceramic crowns?

A

All porcelain crowns

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16
Q

What did full veneer metal crowns used to be known as?

A

Full gold crowns

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17
Q

What was originally used in full venner metal crowns?

A

Type III gold alloy (75% gold Au) expensive

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18
Q

What is a benefit of using type III gold alloy (75% gold Au)?

A

Softer malleable deformed in thin sections

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19
Q

What are the properties of type III gold alloy (75% gold Au) full veneer metal crowns?

A

Strong, well fitting, good longevity durable, bio inert, and poor aesthetics

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20
Q

What is the section of type III gold alloy (75% gold Au) at margins?

A

Thin 0.3mm section

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21
Q

What alternative alloys are used in full veneer metal crowns?

A

White gold and non-precious alloys

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22
Q

What are the constituents of white gold?

A

Au – 30%, Pd – 10-35%, Ag – 35-60%

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23
Q

What are the disadvantages of white gold?

A

More difficult to cast and corrosion

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24
Q

What are the constituents of non-precious alloys?

A

Nickel-Chromium, Chrome-Cobalt, & Titanium

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25
Q

What are the disdavantages of non-precious alloys?

A

Risk of allergies to Ni and casting problems

26
Q

How are Chrome-Cobalt and Titanium now prepared?

A

Milled rather than cast

27
Q

What are the generic principles of crown preparation?

A

Preservation of tooth structure, non-undercut preparation, retention and resistance, occlusal reduction: appropriate, and margin type: appropriate for crown type

28
Q

What are the FVC/MCC/ACC principles of crown preparation?

A

Tooth reduction, non-undercut preparation, retentive preparation, resistant preparation, and occlusal reduction

29
Q

What are the FVC/MCC/ACC principles of crown preparation?

A

Tooth reduction, non-undercut preparation, retentive preparation, resistant preparation, and occlusal reduction

30
Q

What is the tooth reduction of FVC/MCC/ACC crown preparation?

A

Balance between pulp protection and sufficient space for crown material

31
Q

What is the non-undercut of FVC/MCC/ACC crown preparation?

A

To path of insertion, remember undercut is a 3D phenomenon harder to visualise posteriorly

32
Q

What is the retentive preparation of FVC/MCC/ACC crown preparation?

A

Taper preparation 6-10°

33
Q

What is the resistant preparation of FVC/MCC/ACC crown preparation?

A

Increased reduction for metal and ceramic

34
Q

What is the occlusal reduction of FVC/MCC/ACC crown preparation?

A

Functional cusp bevel

35
Q

What is the margin type of FVC/MCC/ACC crown preparation?

A

Shoulder where metal ceramic and chamfer if metal alone/ceramic alone, depth will vary

36
Q

What is occlusal reduction of FVC/MCC/ACC crown preparation dependent on?

A

Functional/supporting cusp and material used

37
Q

What is the margin type of FVC/MCC/ACC crown preparation dependent on?

A

Material

38
Q

What is strong in thin sections?

A

Metal

39
Q

What is weak in thin sections?

A

Ceramic

40
Q

What is the order of full veneer metal crown preparation?

A

Occlusal reduction (1mm reduction), functional cusp bevel (1.5mm functional cusp), chamfer margin (0.5mm deep/half bur 501 depth), and 6-10° taper

41
Q

What are the full veneer metal crown burs?

A

Hi Di 501 and Hi Di 557

42
Q

What are the properties of Hi Di 501?

A

1mm tip, 6° taper, and chamfer margin

43
Q

What is the Hi Di 501 used for in the full veneer metal crown preparation?

A

Majority of preparation

44
Q

What are the properties of Hi Di 557?

A

Long thin needle

45
Q

What is the Hi Di 557 used for in the full veneer metal crown preparation?

A

Proximal reduction

46
Q

What is the posterior crown suggested preparation order?

A

Occlusal reduction, functional cusp bevel extra reduction, buccal and lingual occlusal 1⁄2 reduction, buccal and lingual gingival 1⁄2 reduction, interproximal contact clearance, interproximal margin preparation, and surface and marginal refinement

47
Q

What is the depth of occlusal reduction for metal only crowns?

A

1-1.5mm

48
Q

What is the occlusal reduction depth of ceramic only crowns?

A

1.3mm

49
Q

What is the occlusal reduction depth of metal-ceramic crowns?

A

1.5-2mm

50
Q

What is the occlusal reduction depth of composite crowns?

A

1.5-2mm

51
Q

What is the axial convergent angle of interpoximal reduction?

A

2-5°

52
Q

What is the margin preparation depth of metal-ceramic crowns?

A

1.2-1.5mm shoulder

53
Q

What is the margin preparation depth of metal only crowns?

A

0.5mm chamger

54
Q

What is the margin preparation depth of ceramic only crowns?

A

1mm chamfer

55
Q

Where should margins be placed where possible?

A

Supra-gingival

56
Q

What can sub-gingival margins cause?

A

Gingival inflammation/recession

57
Q

What is important in sub-gingival margins?

A

Gingival biotype

58
Q

What are functional cusps?

A

Cusps that occlude with opposing teeth in centric occlusion

59
Q

What are functional cusps in normal occlusion?

A

Palatal cusps of upper posterior teeth and buccal cusps of lower posterior teeth

60
Q

What will crossbites have?

A

Different functional cusps

Fixed Prosthodontics (3 decks)

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