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Endemic Oral Health > Enamel Caries > Flashcards

Enamel Caries Flashcards

1
Q

what is dental caries

A

progressive destruction of tooth structure

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2
Q

how is dental caries initiated

A

by microbial activity at tooth surface

crown or exp root

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3
Q

what does the enviro do dental caries

A

dept on enviro
can progress unhindered to pulp
can remineralise

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4
Q

what does dental plaque dept on

A

plaque bac
time
substrate
susceptible tooth

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5
Q

what is erosion

A

acid demin/dissolving teeth away not same as caries as source acid of this erosion is dietary acid, saliva buffers this

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6
Q

what is abrasion

A

mechanical wear with other materials

cervical notches worn away due to tooth brush abrasion something else from enviro wearing tooth

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7
Q

what is attrition

A

mechanical tooth on tooth wear
occlusally and ncisally
grinding teeth wear
happen naturally also have approximal attrition shorten arch

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8
Q

what is abfraction

A

bite tooth slightly flexes, not flexible cause micro cracks which wear and weaken

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9
Q

what is the acidogenic theory

A

many organisms can produce acid from fermentation of sugar

many oral bac prod lactic acid

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10
Q

what is the prism unit

A

prism core - centre

prism sheath - periphery

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11
Q

what is the prism core

A

centre
tightly packed hydroxyapatite
little inter crystalline spaces

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12
Q

what is the prism sheath

A

less well packed crystals

space contains water and inorganic mat - enamelling

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13
Q

where does demineralisation start

A

prism sheath periphery

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14
Q

what is the clinical appearance of enamel caries

A

white spot lesion
clean teeth and dry teeth
matt appearance

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15
Q

what does the histology depend on appearance

A

refractive index of mounting medium

penetration of medium

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16
Q

what is the RI air

A

1

17
Q

what is the RI enamel

A

1.62

18
Q

what is the RI water

A

1.33

19
Q

what is the RI of Quinoline

A

1.62 lare molecule

20
Q

what are the lesion zones from the advancing front

A

translucent
dark
body lesion
surface zone

21
Q

what is the translucent zone

A 
1st carious change 
loss 1-2% mineral 
50% cases 
few large pores due to loss of prism periphery 
penetrated byquinolone 
- appears structure less/translucent
- quinolone fills prism periphery
22
Q

what is the dark zone

A 
dark brown with quinolone 
90-95% lesions
porosity 5-10%
consists of large or small pores 
demineralisation and remineralisation occurring
23
Q

what is the body of lesion

A

largest part and centre of lesion
25-50% porosity
enamel relatively translucent
strait retzius obis

24
Q

what is the surface zone

A 
relatively intact 
thick
highly mineralised high F 
porous
protected
redeposit of mineral dissolved from deeper layers
25
Q

should u probe a carious lesion

A

no

26
Q

what is arrested caries

A

remineralised
changes in enviro - plaque control F, altered diet
can be brown - stain

27
Q

hat are some of dentine defence mechanisms ag caries

A

reactionary tertiary dentine

sclerotic blocking tubules

28
Q

if there is rapid progression of dentine caries what is seen

A

no sclerosis
odontoblasts die
possibly reparative tertiary dentin

29
Q

wat is the advancing front of dentine caries

A

some of demineralised dentine
acid demineralisation
no bacteria

30
Q

what si the zone of bacterial penetration

A

bac in tubules
lateral spread via branched tubules
lactobacilli

31
Q

what is the zone of destruction

A

mixed bac pop
proteolytic enzymes
destroys organic matrix

32
Q

dentine can also be describe in a simpler 2 zones method

A

outer superficial zone

inner deeper zone

33
Q

what is the outer superficial zone

A

highly infected
irreversible demin dentine
proteolytic degradation of collagen matrix

34
Q

what si the inner deeper zone

A

dentine reversibly attacked
collagen matrix not severely damaged
minimally infected
potential to repair

35
Q

what are some points on occlusal caries

A

fissures
2 lesions
hard to detect
widening lesion

Endemic Oral Health (7 decks)

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