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BDS - Module 9 > 5. Indirect Restorations > Flashcards

5. Indirect Restorations Flashcards

1
Q

What are the 7 indications for indirect restorations?

A
  1. Repeated failure of direct restorations
  2. Difficulty achieving adequate tooth morphology via direct techniques
  3. To minimise risk of tooth fracture
  4. Aesthetics
  5. To combine with a removable prosthesis
  6. For bridge abutment
  7. To replace an existing crown
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2
Q

What are the 5 contraindications for indirect restorations?

A
  1. Poor oral health
  2. Active disease
  3. Inadequate crown height
  4. Inadequate access
  5. If there is a more minimally invasive option available
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3
Q

What are the 5 steps of a crown preparation?

A
  1. Occlusal red auction
  2. Buccal reduction in 2 planes
  3. Palatal/ lingual reduction
  4. Interproximal reduction
  5. Define margins
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4
Q

What is a shoulder margin cut with?

A

Square, flat bur end

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5
Q

What is a chamfer margin cut with?

A

Round bur

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6
Q

How is GP removed for a post crown?

A

GP is softened with heat/chemicals then removed with a series of gates gladdens burs

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7
Q

How is a post space prepared?

A

By drilling vertically up and down within the root canal system with a series of burs

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8
Q

How is a resin retained bridge prepared?

A
  1. Intra-enamel cingulum rest cut
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9
Q

What are the 4 types of conventional bridge?

A

Fixed - fixed = abutment teeth at either side of pontic
Cantilever = abutment at one side of the pontic only
Fixed Movebale = ?
Complex = any other?

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10
Q

How is a conventional bridge prepared?

A

Same way as a crown

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11
Q

What is the 4 step process of preparing a tooth for a crown?

A
  1. Take pre-op putty impression and take a shade
  2. Cut tooth preparation
  3. Take impressions of preparation using light and heavy body material
  4. Make temporary restoration using pre op putty and pro temp
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12
Q

List 5 ways to make a temporary restoration:

A

Putty index + pro temp
Preformed crowns
Pre-op wax up and vacuum formed stent
Free hand
Previous crown

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13
Q

List the 5 materials used for crowns, bridges and veneers

A

Metal
Metal ceramic
Ceramic
Composite
Acrylic

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14
Q

What margin is required for a metal crown?

A

Any

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15
Q

What margins are required for a metal ceramic crown?

A

Shoulder for ceramic portion
Chamfer for metal portion

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16
Q

What margin is required for a ceramic crown?

A

Chamfer

17
Q

What margin is required for a composite crown?

A

Chamfer

18
Q

What are the 6 principles of tooth preparation?

A

Conserve tooth tissue
Resistance form
Retention form
Structural durability
Marginal integrity
Preserve the periodntium

19
Q

What is an inlay?

A

An indirect restoration that sits on/in the occlusal surface only

20
Q

What is an onlay?

A

An indirect restoration that covers the cusps

21
Q

What are the indications for inlays/onlays?

A

Weakened teeth
To correct occlusion
To reorganise occlusion

22
Q

What are the advantages of inlays/onlays?

A

Protects the cusps
Reduces amount of tooth removal required

23
Q

What are the disadvantages of inlays/onlays?

A

Complex to prepare
Complex to fabricate
Expensive

24
Q

What materials can be used for inlays/onlays?

A

Good
Ceramic
Composite

25
Q

What is a core?

A

A restoration placed in teeth prior to preparation for an indirect restoration.

26
Q

What are the indications for cores?

A

Heavily restored teeth
Heavily broken down teeth

27
Q

What materials can be used for cores?

A

Amalgam
Composite
GI
GMGI
Compomers
Metal alloys

28
Q

What is a post?

A

A post restoration placed within the root canal system to facilitate a core build up if there is insufficient tooth structure to hold a crown.

29
Q

Where would you place a post crown?

A

Anterior teeth only

30
Q

What type of posts are there?

A

Direct - prefabricated and placed chair side
Indirect - made in lab

31
Q

What is an articulator used for?

A

Aims to reproduce the relationship of the jaws in RCP or ICP.

32
Q

What are the 4 types of articulators?

A

Simple hinge
Average value
Semi adjustable
Fully adjustable

33
Q

When would a face bow be used?

A

When more than one unit is being replaced

34
Q

Why would a face bow be used?

A

To allow casts to be mounted on a semi or fully adjustable articulator

35
Q

What is the purpose of a face bow recording?

A

To record the relationship of the maxillary teeth to the condylar head in RCP.

BDS - Module 9 (16 decks)

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