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5th BDS - ACS > Inlay/ Onlay > Flashcards

Inlay/ Onlay Flashcards

1
Q

What is inlay?

A

Intraconoral restoration made indirectly to strengthen and repair posterior teeth

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2
Q

What is onlay?

A

Similar to inlay but extends over weakened cusps to provide extra protection

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3
Q

Indications indirect restorations?

A

Alternative to amalgam
Resin not indicated
Conservative type indirect restoration

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4
Q

Why may resins not be indicated?

A

Size of cavity

Previously failed compoiste

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5
Q

When are inlays indicated?

A

Low caries rate
MO/DO cavities
Conservative MOD

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6
Q

When are onlay indicated?

A

Teeth w/ large restoration but sound buccal and lingual walls

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7
Q

Contraindication onlay/ inlay?

A

Pt w/ poor OH

Excessive loading - bruxism

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8
Q

What materials can be used?

A

Gold
Ceramic
Resin composite

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9
Q

Adv of gold?

A

Conservative
Good marginal integrity
Good wear characteristic
Corrosion resistant

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10
Q

What consider when providing gold restoration?

A

Cost

Poor aesthetic

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11
Q

What can see w/ inlay which can cause fracture?

A

Wedge effect - cause flexion and stress on cusp

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12
Q

Examples of ceramics?

A

Feldspathic glass ceramic
Lithium disilicate ceramic
Leutice reinforced

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13
Q

Advantage of ceramic indirect?

A

Aesthetic

Strength

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14
Q

What consider w/ ceramic indirect restoration?

A

Technique sensitive
Intra-oral adjustment contraindicated until bonded
Adjustment can compromise aesthetics

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15
Q

How are ceramic restorations fabricated?

A

Conventional - pressable/casting

CADCAM- chair/lab

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16
Q

Adv of using indirect resin composite?

A

No polymerisation shrinkage

17
Q

Preparation guideline for onlay/inlay?

A

Unique to restoration/cavity - no specific guideline
Must finish on sound tooth tissue
Avoid contact on occlusal contacts

18
Q

General rules for indirect restoration?

A

Divergent walls - POI
No undercut
Limit POI
Resistance occlusal force

19
Q

What avoid when providing ceramic restorations?

A

Bevel - ceramic would have thin section which would fracture

20
Q

Two different type of temporary restorations available?

A

Direct or infdirect

21
Q

Adv of direct temporisation?

A

No impression required

No temporary cement

22
Q

What need for indirect temporisation?

A

Pre-op impression or lab made shell

23
Q

Cement of choice for gold restoration?

A

GIC

Resin cements - panavia/ rely x unicem

24
Q

How to cement glass ceramics?

A

Fitting surface tx HF acid
Use silane coupling agent
Resin cement

25
Q

Causes of failure inlay/onlay?

A

Bulk fracture - often area cuspal coverage

Marginal breakdown

26
Q

Why resin cements more prone marginal breakdown?

A

Not heavily filled - wear more quickly

27
Q

Most common reason for failure of ceramic?

A

Fractures and chipping

5th BDS - ACS (8 decks)

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