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Flashcards in Principles of Cavity Preparation Deck (20)
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What determines the design of a cavity

Structure and properties of the dental tissue
The disease present
Properties of restorative materials


What must be reviewed and reassessed continually when preparing a cavity

The position of the caries
The extent of the caries
The shape of the prepared cavity
The final restorative material


What are the different positions caries can be found in

Pit and fissure
Approximal - posterior and anterior
Smooth surface


When should you intervene with caries

If the lesion is cavitated
If the patient can’t access the lesion for prevention
If the lesion is into dentine radiographically
If the lesion is causing a pulpitis
If the lesion is unaesthetic


How does dentinal caries usually spread

Laterally along the ADJ


When should healthy tooth tissue be removed

If the material used for the restoration requires it
If the margins of the cavity are in contact with another tooth surface
If the margins of the cavity cross an occlusal contact


What are the principles of cavity preparation

1) Identify and remove carious enamel
2) Remove enamel to identify the maximal extent of the lesion at the ADJ and smooth the enamel margins
3) Progressively remove peripheral caries in dentine - from the ADJ first then circumferentially deeper
4) Only then remove deep caries over the pulp
5) Outline form modification
6) Internal design modification


Describe the properties of a cavity before it is restored

Smooth margins
Appropriate CSMA
No unsupported tooth tissue
No stress concentrator
Internal anatomy that allows adaptation of a material


Describe how the first principle of cavity preparation should be carried out

Apply dam
Remove overlying enamel with a high-speed bur to gain access to carious dentine


Describe how the second principle of cavity preparation should be carried out

Clear all caries at the ADJ
Check staining at ADJ
Smooth enamel cavo-surface margins
Examine adjacent contact for caries
Avoid trauma to adjacent tooth


How should secondary caries be accessed

Use a high-speed bur to remove a restoration
Start from the centre of the restoration and cut towards the edge of the cavity
Remove all the restoration and any underlying base material
Consider waste disposal as materials can be hazardous


Describe how the third principle of cavity preparation should be carried out

Detect dentinal caries as a brown stain or softened tissue when using a sharp probe as sound dentine shouldn’t yield under probing
Remove caries first from the ADJ and last from the pulpal flood


How should caries from the pulpal floor be removed

Hand-held excavator
Round bur
Chemo-mechanical caries removal


Describe how the fourth principle of cavity preparation should be carried out

Decide which restorative material to use
Modify the cavity preparation as appropriate:
Enamel margins CMSA, occlusion internal anatomy, dentine quality


What are the most common restorative materials used for direct restorations



What are the advantages of composite (7)

Conservation of tooth tissue
Support for remaining tooth tissue
Command cure
Low thermal conductivity
Elimination of galvanism


What are the disadvantages of amalgam

Does not bond to enamel or dentine
Does not support the tooth as held into the cavity by retention and resistance form
Need to remove healthy tissue
Not tooth coloured


What are the advantages of amalgam

Strong under occlusal load
Less moisture and technique sensitive


What should the CSMA be for an amalgam restoration

Between 90-120 degrees


When is it acceptable to not remove all caries

Can seal deep caries in instead of exposing the pulp