Operative Dent Flashcards

1
Q

What 4 things are there a strong relationship between in cavity preparation?

A
  • the position of the caries
  • the extent of the caries
  • the shape of the prepared cavity
  • the final restorative material
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2
Q

Name 4 positions of caries?

A

= pit & fissure
= approximal
= smooth surface
= root

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3
Q

What are the 6 principles of cavity design and preparation?

A

= identify and remove carious enamel
= remove enamel to identify the maximal extent of the lesion at the amelodentinal junction and smooth the enamel margins
= progressively remove peripheral caries in dentine - from the ADJ first, then circumferentially deeper
= only then remove deep caries over pulp
= outline form modification (cava-surface margins)- enamel finishing, occlusion, requirement of the restorative material
= internal design modification - internal line and point angles, requirement of the restorative material

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4
Q

What 5 things are critical in the final seal of the restoration (cavity prep)?

A

= smooth margins
= appropriate CSMA
= no unsupported tooth tissue
= no stress connectors
= internal anatomy that allows adaptation of material

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5
Q

Advantages of composite?

A

= aesthetics
=conservation of tooth tissue
= support for remaining tooth tissue
=adhesion/bonding
=command cure
= low thermal conductivity
= elimination of galvanism
= amalgam alternative - NHS SDR

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6
Q

Negatives of using amalgam…

A

= does not bond to enamel or dentine
= does not support the tooth
= common for pieces of tooth to breakaway

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7
Q

Minimum depth of amalgam bulk?

A

= 2mm deep

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8
Q

What are some examples of retention?

A

= undercuts
= dovetail
=key
= isthmus

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9
Q

What can any micro-leakage lead to?

A

penetration and ingress of bacteria, collection of plaque and secondary caries

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10
Q

Can you leave caries at the margins of the cavity?

A

NO

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11
Q

How is the hybrid layer made?

A

= removal of smear layer
= solubilised surface
= collagen fibril matrix
= no water content
= solvent/aqeuous primer
= hydrophobic resin
= air inhibition

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12
Q

What does configuration factors mean?

A

ratio of bonded surfaces to un-bonded surfaces ( important for composite restorations)

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13
Q

What is used to etch the enamel?

A

37% phosphoric acid - to roughen the surface

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14
Q

Why else are we etching the enamel and dentine?

A

to remove the smear layer

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15
Q

Smear layer?

A

layer of organic material which is produced whenever we use a high speed hand piece or slow speed hand piece on dentine (we want to expose out dentinal tubules)

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16
Q

Why should you not dry out dentine?

A

post-operative sensitivity

17
Q

What composite has less filler content?

A

flowable composite (reducing the polymerisation contraction stresses)

18
Q

Why do we not join one enamel margin to another enamel margin?

A
  • gives us the risk of cohesive enamel fracture
19
Q

How can you counter contraction stresses?

A

incremental build up
warm composite
flowable composite
curing regime
C-factor considerations