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RESTO BDS5 RESET AGAIN > Inlays/Onlays > Flashcards

Inlays/Onlays Flashcards

1
Q

What is the defintion of an inlay?

A

Is an indirect intracoronal restoration, places in a prepared cavity space

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2
Q

Name the 3 principles of inlays?

A

Wedge retention
Stress proportionak to cusp height and width of isthmus
No reinforcement of remaining tooth structure
- marginal leakage
- cusp fracture
- loss of restoration

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3
Q

Name the indications of inlays?

A

Same as for direct restorations

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4
Q

Name the 3 contraindications of inlays?

A

Caries; MOD on premolars and wide isthmus MOD on molars
Root filled teeth

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5
Q

What is the defintion of wedge retention?

A

The stress should be transmitted to tooth tissue
Effective height of the lingual cusp
- possible fracture of vulnerable cusp

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6
Q

What is the definition of an onlay?

A

Is an indirect extracoronal restoration, usuallynplaced after tooth surface reduction

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7
Q

Name the indications of onlays?

A

Cuspal coverage
Restoration of Functional cusp
Restoration of lost tooth tissue

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8
Q

What isnthe difference between a direct and indirect restorations?

A

Direct:
- places by operator chair side - plastic material
- no conventional or digital impression needed
Indirect:
- fabricated outside the mouth in a lab and cemented as a rigid unit
- impression required

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9
Q

Name the 3 types of materials for inlays and onlays?

A

Metal
Composite
Porcelain

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10
Q

What are the advantages and disadvantages of using precious metal for an inlay or onlay?

A

Low corrosion
Low wear to opposing teeth
Relatively easy to cast and adjust
Can be considered aesthetic
Expensive
Difficult to bond directly to surface (surface treatment required)

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11
Q

What are the advantages and disadvantages of non-precious metal?

A

Very hard metal and so difficult to adjust
Greater wear to opposing teeth
Some alloys have low corrosion resistance
Not much cheaper than precious
Silver in colour
Bond well to composite

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12
Q

What are the advantages of indirect composite?

A

Good aesthetics
Less expensive
Easier to repair
Poor wear resistance

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13
Q

Name the 4 ways in which a inlay/onlay is retained in a cavity?

A

Luting cements
Mechanical retention
Binding
Micro-mechanical retention

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14
Q

What is the defintion of a luting cement?

A

Fills hap between restoration and cavity

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15
Q

What is the defintion of mechanical retention?

A

Parallex axial walls and resistance form

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16
Q

What is the defintion of bonding?

A

Chemical adhesion between restoration and cavity

17
Q

What is the defintion of micromechanical retention?

A

Retention due to adhesive nagerial locking into surface irregularities

18
Q

Mechanical retention and resistance?

A

Load applied to lingual cusps, lead to the buccal cusps to lift off, and creater a point of rotation at the base of the lingual wall

19
Q

How to bond tooth tissue to the restoration?

A

Most need resin based cements
Base metal - MDP or 4 META
Ceramic - silane coupler
Noble metal - high Cu, Sn plating with MDP

Augmented by surface treatments
- sandblasting
- HF to etch ceramic

20
Q

Name 2 types of surface treatments?

A

Sandblasting metal
HF to etch ceramic

21
Q

Explain enamel bonding?

A

Etching of enamel surface
Micromechanical retention
However sensitive to contamination

22
Q

Explain dentine bonding?

A

Conditioning of dentine
Adhesion to the hybrid layer
However sensitive to contamination
Requires hydrated dentine

23
Q

How important is surface roughness?

A

Is important when trying to create micromechanical retention
- which is why surfaces are treated to increase the roughness

24
Q

What are the principles of ceramic onlays?

A

Compared with metal restorations, ceramic or composite indirect restorations:
- requires bulk for strength
- greater extension on proximal (finishing)
- rounded internal angles (reduces stress concentration)
- greater taper of walls (less retention required because bonded; manufacturing technique)
- are bonded to tooth tissue

25
Q

Describe the requirements of gold inlays/onlays (cavity prep)

A

1-1.5mm occlusal clearance
Sharp internal angles
Bevelled shoulders in box and on functional cusps (onlay)
Proximal flare
6-10 degrees occlusal divergence in isthmus and boxes
Isthmus bevel (inlay)
Minimal proximal extension
Luted to tooth

26
Q

Describe the requirements of ceramic inlays/onlays (cavity prep)

A

1.5-2mm occlusal clearance
Rounded internal angles
90 degree finish lines in box and on all cusps
No bevels
1mm shoulder
12-15 degree occlusal divergence in isthmus and boxes
Greater proximal extension
Bonded to tooth

27
Q

Explain the step by step guide to create a cavity for an inlay indirect restorations?

A

Matrix for temp/guide reduction
Place dam
Remove old reato
Evaluate tooth for appropriate restoration - block out minor undercuts in GIC
Prepare occlusal portion
Prepare proximal boxes
Pcclusal clearance
Finish margins
Temporaries
Impressions

28
Q

Describe the requirements of a metal MOD onlay cavity?

A

Proximal box
Proximal flare
Isthmus
Buccal bevel
Occlusal reduction
Functional cusp bevel
Occlusal bevel
Lingual bevel
Ginguval bevel

29
Q

Describe the cavity requirements for a metal onlay?

A

1mm planar occlusal reduction
1.5 mm for functional cusp
Buccal cusp needs a bevel
Functional cusp line = shoulder or heavy chamfer
Sharp internal angles
Proximal bevel and flare

30
Q

Describe the cavity preparation for a cermaic/composite onlay?

A

1.5 mm planar occlusal reduction
2 mm for functional cusp
Buccal cusp needs a butt finish
Functional cusp finish needs a shoulder
Rounded internal angle
No proximal bevel or flare

31
Q

Explain how to create a temporary restoration?

A

Apply vaselune to plastic teeth
Mix composite - ProTemp/integrity
Place composite in matrix
Seat over prep
Follow manufactures instructions
Add flowable composite to fill any voids
Trim excess with soft flex discs

32
Q

Manufacturers instructions for ProTemp?

A

49 second working time
1:40 m for setting in mouth
2:50 m for matrix removed
5:00 m removal from matrix and finishing

33
Q

Notes for clinic?

A

Full arch impression required
- light and medium bodied silicone
- opposing arch in alginate
Biscuit try in (ceramic)
Return to lab for glazing
Try in
Cement

RESTO BDS5 RESET AGAIN (20 decks)

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