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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
What are the disdavantages of non-precious alloys?
Risk of allergies to Ni and casting problems
26
How are Chrome-Cobalt and Titanium now prepared?
Milled rather than cast
27
What are the generic principles of crown preparation?
Preservation of tooth structure, non-undercut preparation, retention and resistance, occlusal reduction: appropriate, and margin type: appropriate for crown type
28
What are the FVC/MCC/ACC principles of crown preparation?
Tooth reduction, non-undercut preparation, retentive preparation, resistant preparation, and occlusal reduction
29
What are the FVC/MCC/ACC principles of crown preparation?
Tooth reduction, non-undercut preparation, retentive preparation, resistant preparation, and occlusal reduction
30
What is the tooth reduction of FVC/MCC/ACC crown preparation?
Balance between pulp protection and sufficient space for crown material
31
What is the non-undercut of FVC/MCC/ACC crown preparation?
To path of insertion, remember undercut is a 3D phenomenon harder to visualise posteriorly
32
What is the retentive preparation of FVC/MCC/ACC crown preparation?
Taper preparation 6-10°
33
What is the resistant preparation of FVC/MCC/ACC crown preparation?
Increased reduction for metal and ceramic
34
What is the occlusal reduction of FVC/MCC/ACC crown preparation?
Functional cusp bevel
35
What is the margin type of FVC/MCC/ACC crown preparation?
Shoulder where metal ceramic and chamfer if metal alone/ceramic alone, depth will vary
36
What is occlusal reduction of FVC/MCC/ACC crown preparation dependent on?
Functional/supporting cusp and material used
37
What is the margin type of FVC/MCC/ACC crown preparation dependent on?
Material
38
What is strong in thin sections?
Metal
39
What is weak in thin sections?
Ceramic
40
What is the order of full veneer metal crown preparation?
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
What are the full veneer metal crown burs?
Hi Di 501 and Hi Di 557
42
What are the properties of Hi Di 501?
1mm tip, 6° taper, and chamfer margin
43
What is the Hi Di 501 used for in the full veneer metal crown preparation?
Majority of preparation
44
What are the properties of Hi Di 557?
Long thin needle
45
What is the Hi Di 557 used for in the full veneer metal crown preparation?
Proximal reduction
46
What is the posterior crown suggested preparation order?
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
What is the depth of occlusal reduction for metal only crowns?
1-1.5mm
48
What is the occlusal reduction depth of ceramic only crowns?
1.3mm
49
What is the occlusal reduction depth of metal-ceramic crowns?
1.5-2mm
50
What is the occlusal reduction depth of composite crowns?
1.5-2mm
51
What is the axial convergent angle of interpoximal reduction?
2-5°
52
What is the margin preparation depth of metal-ceramic crowns?
1.2-1.5mm shoulder
53
What is the margin preparation depth of metal only crowns?
0.5mm chamger
54
What is the margin preparation depth of ceramic only crowns?
1mm chamfer
55
Where should margins be placed where possible?
Supra-gingival
56
What can sub-gingival margins cause?
Gingival inflammation/recession
57
What is important in sub-gingival margins?
Gingival biotype
58
What are functional cusps?
Cusps that occlude with opposing teeth in centric occlusion
59
What are functional cusps in normal occlusion?
Palatal cusps of upper posterior teeth and buccal cusps of lower posterior teeth
60
What will crossbites have?
Different functional cusps

Fixed Prosthodontics (3 decks)

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