Pits and Fissure caries Flashcards

1
Q

what is the main reaction of the pulp towards injury

A

inflammation

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2
Q

what are the histological changes in dentine/pulp due to caries

A

The pulp initiates the production of tertiary dentine which results in histological changes in dentine as tertiary dentine is produced much faster and has a much more disorganized structure compared to primary and secondary dentine

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3
Q

what is a provisional restoration

A

a provisional restoration is a fixed prosthesis which is designed to enhance aesthetics, stabilization and/or function for a limited period of time after which it is to be replaced by a definitive prosthesis

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4
Q

why may we use a provisional restoration

A

Sometimes we use a provisional restoration if we feel we are too close to the pulp then we can use a provisional restoration to allow the pulp to initiate the production of more tertiary dentine meaning that when we come back to remove the remaining caries we are now further away from the pulp

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5
Q

where do we penetrate the enamel

A

where caries is greatest - central pit

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6
Q

what bur do we use for the initial cut

A

high speed diamond fissure

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7
Q

what bur do we use to remove dentinal caries

A

slow speed steel round bur

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8
Q

why do we remove dentinal caries from the periphery and work towards the centre

A

we do this to ensure that if the pulp is encountered at the base of the lesion there will be a minimum of infected dentine inside the cavity

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9
Q

for glass ionomer, what do we condition cut dentine with

A

polyacrylic, polyaleic or citric acids

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10
Q

why is it important not to overdry the cavity when washing and drying off the poly acrylic acid

A

GI absorbs water during the setting reaction so if the tooth surface is left too dry then fluid from the dentinal tubules may be drawn out resulting in post op sensitivity

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11
Q

what do we apply after application of the GIC

A

resin surface sealant and air thin

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12
Q

what do we remove with a rotary brush and prophylaxis paste at the end

A

oxygen inhibited surface layer

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13
Q

what is the oxygen inhibited surface layer

A

When composite is light cured, oxygen in the air causes an interference in the polymerization resulting in the formation of an oxygen inhibition layer on the surface of the composite. The oxygen-inhibited layer is the sticky, resin rich uncured layer that is left on the surface.

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14
Q

what is in prime and bond NT

A
PENTA
UDMA
acetone for solvent
silica nano filler
camphorquinone 
(more)
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15
Q

What is a dental liner

A

material that is usually placed in a thin layer over exposed dentine within a cavity preparation

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16
Q

what is the function of a dental liner

A

dentinal sealing, pulpal protection, thermal insulation and stimulation of the formation of secondary dentine.

17
Q

why should GIC not be placed as a liner if the pulp is exposed

A

can result in localized areas of pulpal necrosis which inhibits calcific repair