L3 Anterior veneers Flashcards

1
Q

What is an anterior laminate veneer?

A
  • A thin section of porcelain, composite or gold that hides a disease, damaged or discoloured tooth to provide the illusion of a healthy/undamaged/better coloured tooth
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2
Q

Name indications for veneers.

A

Intrinsic discolouration:
- Trauma (pulpal haemorrhagic products)
- Hereditary conditions (amelogenesis/dentinogenesis imperfecta)
- Metabolic disease (alkaptonuria)
- Systemic and developmental factors (MIH, tetraycline staining, fluorosis)

Single/multiple tooth issues:
- Tooth malalignment
- Peg lateral
- Spacing
- Microdontia
- Localised trauma, chipped edges
- Discoloured facial restorations

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3
Q

What treatments may be a suitable alternative to veneers?

A
  • Internal/external bleaching
  • Direct facial composite placement
  • Micro abrasion (e.g. ICON- bleaching and resin infiltrate)
  • Orthodontics
  • Implant and crown/bridge placement
  • Removable partial denture
  • Direct bonding composite replacement
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4
Q

What are the contraindications for veneers?

A
  • Poor OH
  • High caries risk
  • Inability to achieve isolation
  • Insufficient enamel to bond
  • Parafunctional habits
  • Unfavourable occlusion
  • Thin gingival biotype (prone to recession)
  • Single teeth (pt expectation vs delivery)
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5
Q

What 4 veneer types are there? List from least to most destructive.

A
  • Window
  • Feather
  • Bevel/butt
  • Overlap

Bevel and overlap are the most common type.

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6
Q

What are the advantages and disadvantages of a window preparation veneer?

A
  • Minimal preparation
  • Conserves the incisal edge
  • Incisal edge enamel weakened
  • Margins vulnerable to tooth wear
  • Marginal join in the aesthetic zone (visible)
  • Incisal luting agent may be difficult to hide
  • Challenging to seat
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7
Q

What are the advantages and disadvantages of a feather preparation veneer?

A
  • Incisal edge is maintained
  • Interface between veneer and tooth hidden on/just behind incisal edge
  • Substantial amount of enamel preserved
  • Veneer is liable to be fragile at the incisal edge, incisal edge may fracture
  • Subject to peel/sheer forces during protrusion
  • Challenging to seat perfectly
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8
Q

What are the advantages and disadvantages of a bevel/butt edge preparation veneer?

A
  • Greater control of incisal aesthetics
  • Bigger bulk of porcelain at incisal edge gives greater strength
  • Margin not subject to direct shear forces
  • Easier to seat

Most common preparation choice.

  • More extensive tooth preparation
  • Cannot have more than 2mm of unsupported poreclain
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9
Q

What are the advantages and disadvantages of an incisal overlap veneer?

A

Also called modified butt/taco style
- Positive seating
- Tend to be more successful

  • Preparation is more difficult and there is more tooth destruction
  • When trying to fit the veneer, the path of insertion requires care and there is a risk of fracture
  • Technically more difficult to produce
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10
Q

What are the benefits of bevel/butt and incisal overlap veneer types?

A
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11
Q

Where should the margin be for a ceramic veneer preparation?

A

Margins should be in enamel, not dentine.

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12
Q

How deep should the preparation be for a ceramic veneer?

A
  • 0.3mm cervical (where enamel is thinnest)
  • 0.5mm
  • 0.5-0.7mm incisally
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13
Q

Where should the proximal finishing line be for a ceramic veneer?

A

Between the labial and palatal surfaces, hides the margin.
Do not extend beyond the contact points! Keep contact points intact.

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14
Q

How much incisal edge reduction is required for a ceramic veneer?

A

0.7-1mm if reduction is necessary.

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15
Q

Describe the steps for an anterior veneer preparation (bevel).

A
  • Chamfer bur to reduce incisal edge by 0.7-1mm
  • 2 plane labial reduction using chamfer bur
  • Margin should be 0.5mm from cervical margin
  • Bevel incisal-buccal interface
  • Create proximal margins using chamfer bur, keep contact point intact
  • Reduce any high spots
  • Refine proximal margins with fine needle bur
  • Make final refinement with a red band (fine grit) flame composite finishing bur
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16
Q

What materials can be used for anterior veneers?

A
  • Composite
  • Porcelains: Emax (aka lithium disilicate) and Zirconia
  • Alumina
17
Q

What are the advantages and disadvantages of composite veneers?

A
  • Repeatably repairable chairside
  • Shade changeable over time, e.g. can add a lighter shade
  • Stains
  • Loses lustre
    However, can be polished quite a lot before the intergrity of the composite is lost.
18
Q

What are the advantages and disadvantages of porcelain veneers?

A
  • High lustre and stain restistance
  • Wear resistant
  • More fracture resistance
  • Difficult to repair
  • Poor flexural strength until bonded
  • Failure requires remaking veneer, requires anoth prep (more tooth destruction)
19
Q

What are the key tips to remember for successful veneers?

A
  • Limit prep to enamel only, best for bonding and less destructive
  • Don’t trial fit veneer to a stone model, dust affects the bond strength and veneer will need cleaning by lab
  • Proper moisture control is imperative
  • Follow cementation instructions fully
  • Avoid touching the fit surface or cementation material with latex gloves, latex reduces bond strength
  • Ceramic veneers are relatively fragile until bonded, be careful when handling, seat with continual low pressure to allow flow of the luting agent
20
Q

What is the final veneer shade dependent on?

A
  • Ceramic shade
  • Luting cement
  • Underlying tooth