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OSCE Bds2b > DMS > Flashcards

DMS Flashcards

1
Q

What are the components of composite?

A

Dimethylacrylate

Camphorquinone

Silane coupling agent

Glass filler

Soft resin

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2
Q

Function of the dimethylacrylate and silane coupling agent?

A

DMA = forms two bonds rather than one in resin

SCA = forms bond between resin and the hard filler

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3
Q

Function of camphorquinone and soft resin and the glass filler?

A

Cam = light activated free radical addition polymerisation

SR = polymerised by Cam

Hard filler = added mechanical properties

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4
Q

What are the components of amalgam?

A

Mercury

Silver

Tin

Copper

Zinc

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5
Q

What are the three gamma phases?

A

Gamma is unreacted material of mercury and tin

Gamma 1 is strong, corrosion resistant silver-mercury

Gamma 2 is very weak corrosive tin-mercury

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6
Q

What do mercury and zinc function as in amalgam?

A

Mercury is a liquid so it is workable

Zinc is an oxidiser

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7
Q

What does silver do in amalgam?

A

Silver adds strength, reduces creep too, also increases setting strength

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8
Q

What does copper do in amalgam

A

Copper enriched amalgam has less gamma 2 phase

So less creep and corrosion, and stronger properties

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9
Q

What does tin function as in amalgam

A

Tin contributes to small amounts of corrosion

This helps seal restoration margins however causes creep

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10
Q

What are the three setting stages for GIC

A

Dissolution, gelation and hardening

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11
Q

Describe dissolution

A

Polyacrylic acid attacks glass particles releasing metal ions Ca, Na, Al, and F

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12
Q

Describe gelation.

A

Calcium bivalve to ions crosslink between poly salt chains.

Calcium can bind to same chain with both links so does not always create increased strength with every molecule

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13
Q

Describe hardening

A

Trivalent aluminium ions crosslink between 3 chains and harden the substance, increasing strength

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14
Q

How does GIC bind to enamel?

A

Calcium in enamel cross links with polyacrylic acid in the GIC

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15
Q

What are the components of ZOE?

A

Zinc oxide base powder

Eugenol and glycol liquid with some water

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16
Q

Setting reaction of ZOE?

A

Chelation reaction between Zinc oxide with eugenol to form zinc eugenolate matrix which encases unreacted ZnO particles

17
Q

Pros of ZOE

A

Best biological seal of dentinal tubules however not biocompatible

Eugenol acts as obtundant

Neutral pH

Rapid setting time

Low thermal conductivity

18
Q

Cons of ZOE?

A

No reparative dentine
Soluble
No fluoride
Cannot be used under composite or amalgam

19
Q

Components of GIC?

A

Solid : Glass silica powder, ionic salts, calcium fluoride

Liquid : polyacrylic acid and tartaric acid

20
Q

What are the three cavity liners you can use on paeds teeth

A

MTA, Ca(OH)2, GIC

21
Q

What is MTA? And where is it used?

A

Mineral trioxide aggregate

Used as an apical barrier is open apex Endodontics

Can also be used as a cavity liner above the roots

22
Q

What are the two types of Ca(OH)2 liner?

A

Ultracal - liner, non-setting

Dycal, exposures, setting

23
Q

What are benefits of Ca(OH)2

A

Radiopaque

Sets fast

Bactericidal and produces reparative dentin due to alkalinity

24
Q

What are the cons of Ca(OH)2

A

Soluble

Low compressive strength

Should be covered by rmgic

25
Q

Why is ZOE typically not used as a liner

A

Low compressive strength and also reduced bond strength of composite as it is not compatible

Soluble which can be good and bad as it dissolves away but eugenol can decrease pulpal pain

26
Q

Where may ZOE be used?

A

To fill voids in root canal surgery, main use in GP and around go to seal cone

27
Q

How does CaOH set?

A

Acid base reaction

Catalyst paste of CaOH and a base paste containing zinc oxide in glycol salicylate react to form CaOH liner

28
Q

Benefits of using MTA?

A

Highly biocompatible optimising healing

Similar expansion and contraction to dentine allowing for a very good marginal seal and preventing bacterial ingress

Low solubility

sets in a moist environment and produces Ca(OH)2 leading to a high pH

29
Q

Cons of using MTA?

A

Long setting time, so not optimal when treating an uncooperative patient or child

Potential for discolouration of tooth

30
Q

Pros of GIC

A

F release No shrinkage Good thermal prop Good compressive strength Natural bond to enamel and dentine

31
Q

Cons of GIC

A

Brittle Poor aesthetics Requires etch High initial solubility

OSCE Bds2b (19 decks)

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