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DDS1-resto > class I and II resto > Flashcards

class I and II resto Flashcards

1
Q

most common cause of pulpal inflammation

A

microbial contamination

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2
Q

most common microbial source

A

caries

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3
Q

class I caries

A

lesions that occur in pits and fissures on the facial, lingual, and occlusal surface of M and PM, and lingual surface of max anterior teeth

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4
Q

class II lesion

A

lesions that occur in the proximal surfaces of posterior teeth

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5
Q

class V lesion

A

lesions that occur in smooth facial and lingual surfaces in the gingival third of teeth

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6
Q

how far deep should you go into dentin for cavity prep

A

0.5 mm

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7
Q

depth of amalgam in central area

A

2.0 mm

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8
Q

if the distance to the wall from the prep is >1.6 mm what should u do

A

convergent

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9
Q

if the distance to the wall from the prep is < or equal to 1.6 mm what should you do

A

divergent

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10
Q

what is extension for prevention

A

sacrificing sound enamel and dentin to place cavity margins into a “caries-immune” site

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11
Q

what does extension for prevention lead to

A

re-restoration cycle

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12
Q

why doesnt extension for prevention work

A
  • resto is prone to failures

- does not guarantee caries-free

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13
Q

three preventative measures for controlling caries by preventive approach

A
  • fluoride
  • oral hygiene
  • diet
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14
Q

HAP critical ph

A

5.5-6

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15
Q

FAP critical pH

A

4.5

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16
Q

two functions of fluoride

A
  1. form FAP crystals (acid resistant, decrease critical pH)

2. attract Ca+2 which attract PO4 ions (speed up remin)

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17
Q

which bacteria is abundant after cavitation

A

lactobacilli

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18
Q

what bacteria forms carious lesions

A

strep mutans

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19
Q

class V definition

A

lesions that occur on smooth facial and lingual surfaces in the gingival third of teeth

20
Q

fissure caries disease process

A
  • tip of triangle is towards surface

- follows enamel rods, hits dej, then goes down

21
Q

smooth surface caries disease process

A
  • base of triangle is towards surface

- follows enamel rods, hits dej, then goes down more

22
Q

when do you do class v with amalgam

A
  • moisture control is a problem
  • high caries risk
  • all sub gingival cases
23
Q

occlusal boundary for class v cavity outline is

A

height of contour

24
Q

stages of ecological hypothesis

A
  • dynamic stability
  • acidogenic
  • aciduric
25
Q

dynamic stability stage

A
  • non-MS and actinomyces

- mild/infrequent acidification

26
Q

acidogenic stage

A
  • low pH non-MS and actinomyces

- moderate/frequent acidification

27
Q

aciduric stage

A
  • increase in MS and non-mutans aciduric bacteria

- sever/prolonged acidification

28
Q

enamel and dentin have HAP-like minerals that are

A

more acid-soluble than pure HAP and FAP

29
Q

HAP-like impurities in enamel and dentin contain

A

carbonate ions that replace the phosphate ions

-enamel (1 of 10), dentin (1 of 5)

30
Q

what do carbonate ions in the crystal do

A

produce defects and calcium-deficient regions

-MORE susceptible to caries initiation :(

31
Q

what happens during pH 4.5-5.5

A
  • formation of FA
  • FA precipitates on enamel
  • brings Ca and PO4 ions to surface
32
Q

3 roles of f-

A
  • reduce enamel net demin
  • speeds up remin
  • forms FA crystal
33
Q

5 zones of caries

A
  • surface zone
  • body
  • dark zone
  • translucent zone
  • normal enamel
34
Q

surface zone

A

highly mineralized

35
Q

body of lesion

A

10-25% pores

36
Q

dark zone

A

2-4% pores

37
Q

translucent zone

A

1% pores

38
Q

normal enamel

A

0.1% pores

39
Q

where does caries begin on occlusal lesion

A

lateral fissure wall

40
Q

grade 0

A

no change with prolonged drying

-sound tooth structure

41
Q

grade 1

A

opacity visible after air drying

-demin in outer 50% enamel

42
Q

grade 2

A

opacity without air drying

-demin between 50% enamel and outer dentin

43
Q

grade 3

A
  • enamel breakdown in opacity
  • grey discolouration
  • demin to middle third of dentin
44
Q

grade 4

A

cavitation

-significant amount of dentin involved

45
Q

critical pH pooint for cementum

A

6.2

46
Q

why is it still easier to arrest progression of root caries than enamel caries

A

roots have greater reuptake of fluoride than enamel

DDS1-resto (2 decks)

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