4D 2.4 Hard Tissue Biology Flashcards

1
Q

name the marked features

A
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2
Q

what ar ethe ideal properties of tooth

A

Strong

Hard

Wear resistant

Resistant to chemical damage

Ability to respond to insult/damage

Ability to repair

Aesthetic

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3
Q

what is the main structural feature of enamel

A

enamel prisms

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4
Q

what does the enamel cover

A

anatomical crown

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5
Q

what percentage of hydroxyapatite is found in enamel

A

96%

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6
Q

whats harder the enamel or the dentine

A

enamel is harder

enamel (KHN 360-390)

dentine (KHN 75)

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7
Q

enamel bur needs to be used to cut through enamel

what are the three requiretments for the drill

A

high speed

diamond

tungsten carbide

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8
Q

what is the risk of having an un-supported enamel

A

easily fractured with a hand instrument

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9
Q

what is dentines mineral and collagen composition

A

70% mineral

20% collagen

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10
Q

describe the direction of collagen fibres in the dentine

A

follows the shape of the enamel

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11
Q

carious dentine is soft. what bur or instrument would be used to cut through it.

A

bladed bur or hand excavator

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12
Q

sound dentine is less hard than enamel

what two options are availble when cutting

A

diamond burs - high speed

bladed burs low/high speed

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13
Q

there are tubules present in dentine, which carry on to the pulp (15k to 65k per mm2)

what may tubules contain

A

cell processes

nerves

fluid - flows out

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14
Q

would you find more tubules per mm2 in the amelodentinal junction or the predentine

A

predentine

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15
Q

how do fillings bond to dentine

A

resin

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16
Q

how do fillings bond to enamel

A

acid etch

17
Q

what is the cementum enamel relationship

A
18
Q

what sits in the centre of the hydroxyapatite chemical structure

A

OH-

19
Q

what is the hydroxyapatite enclosed by

A

6 Ca2+ ions

20
Q
A