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23 Endodontics > 10 - Pulp Anatomy > Flashcards

10 - Pulp Anatomy Flashcards

1
Q

what is important to know in general dental anatomy to determine pulp anatomy (“textbook knowledge”

A
  1. number of roots
  2. number of canals
  3. longitudinal and cross sectional shapes
  4. curves
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2
Q

what is a two dimensional view of a three dimensional object

A

radiographic evidenec

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3
Q

are canal aberrations visible in radiographs

A

NO

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4
Q

are radiographs from different angles recommended?

A

YES

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5
Q

if you dont have a CBCT, what should you do for radiographic evidence

A

do radiographs from different angles

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6
Q

what do you explore in root canal anatomy? how?

A

explore: access prep and search for canals
thru magnification and illumination

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7
Q

the shape of the pulp system reflects what

A

surface outline of crown and root

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8
Q

what can different cross section of root and canal anatomy look like

A
  • round
  • oval
  • figure 8 or ribbon shaped
  • c shaped
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9
Q

T/F: different shapes may appear at different levels in the same root

A

TRUE

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10
Q

T/F: assume you have the MINIMUM of canals until proved otherwise

A

FALSE! assume MAXIMUM

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11
Q

what cause alterations in internal anatomy

A
  • age
  • irritants
  • calcifications
  • resorption
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12
Q

what shape canal

A

figure 8

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13
Q

how does age alter internal anatomy

A

In molars the roof and floor of chamber show more dentin formation with age,
resulting in a disc-like shape of the chamber

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14
Q

how do irritants alter internal anatomy

A

Irregular dentin formation tend to occur directly under the involved tubules

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15
Q

what are the components of the pulp system

A
  • Pulp Horns
  • Pulp Chamber
  • Root Canals
  • Accessory Canals
  • Apical Foramen
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16
Q

A

A

lateral canal

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17
Q

B

A

apical foramen

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18
Q

A

A

pulp chamber

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19
Q

B

A

pulp horn

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20
Q

C

A

root canal

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21
Q

A

A

canal orifices

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22
Q

B

A

developmental grooves

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23
Q

is this tooth vital or necrotic

A

necrotic! super dry

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24
Q

what is funnel shape from canal orifice to apical foramen

A

root canals

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25
Q

T/F: most canals are STRAIGHT

A

FALSE! curved

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26
Q

where do most curves of root canal occur

A

in faciolingual direction (important in xrays)

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27
Q

T/F: shape and size of root canals are variable

A

TRUE

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28
Q

where is the chamber occupy

A

center of crown

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29
Q

what do the canals occupy

A

center of root

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30
Q

T/F: there are curves you cannot see in conventional radiographs

A

TRUE

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31
Q

If a root appears wide in radiograph, there is a good chance of what?

A

that there are two canals

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32
Q

what are canal aberrations

A
  • isthmuses
  • cul-de-sacs
    -fins
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33
Q

where are accessory canals frequent

A

apical third

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34
Q

accessory canals can lead to what

A

lateral lesions

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35
Q

where can microbes gain entry into the pulp

A

thru lateral canals

36
Q

what connect the floor of pulp chamber with furcation in posterior teeth

A

furcal canals

37
Q

what can lead to furcation destruction (furcation lesion)

A

furcal canals

38
Q

furcal canals are lesions of what origin?

A

endo origin

39
Q

do furcal canals heal after endo therapy

A

YES

40
Q

how may Weine’s canal classifications are there

A

Type I->IV

41
Q

what weine’s canal classification

A

I

42
Q

what weine’s canal classification

A

II

43
Q

what weine’s canal classification

A

III

44
Q

what weine’s canal classification

A

IV

45
Q

individual tooth anatomy can very according to what?

A

according to different studies and among different race groups

46
Q

describe maxillary central incisor

of canals, curvature, percent of 2 canals

A

one canal
usually straight
two canals less than 0.5%

47
Q

describe maxillary lateral incisor

of canals, curvature, percent of 2 canals

A

one canal
curvature in apical third
two canals less than 0.5%

48
Q

describe maxillary cuspid

A

One canal
Wide in bucco-lingual dimension
Apical curve
Two canals never been reported

49
Q

what type is the hardest one to treat

A

Type IV

50
Q

over 90% of maxillary 1st bicuspid have how many canals?

A

2 canals

51
Q

what percent of maxillary first bicuspid have three canals

A

3-6%

52
Q

maxillary second bicuspid has 53% ___ canal. the other half has hoe many canals

A

53% = 1 canal
46% = 2 canals
1% = 3 canals

53
Q

how many roots does maxillary 1st molar usually have? how many canals?

A

almost always has three roots, four canals

54
Q

what are the names of the canal of maxillary first molar

A

MB canal, MB2 canal, DB canal P canal
MB2 always present but sometimes cannot find it

55
Q

what is the 4th canal called in max 1st molar? where?

A

Fourth canal is called mesio-lingual canal or MB2 and is located in the mesio-buccal root, lingual

56
Q

lingual of maxillary first molar is what type canal

A

type II

57
Q

what is most likely amount of roots in max second molar

A

3 roots = 60%
4 canals = 30% (when present it is located in M-B root)
2 roots = 25%
1 root = 10%

58
Q

when present in max second molar, where is the 4th canal present

A

mesio-buccal root

59
Q

describe canals of mand central

A

70% one canal
30% two canals

60
Q

describe canals of mand laterals

A

55% one canal
45% two canals

61
Q

are second canals common in mandibular incisors?

A

YES!

62
Q

how many canals in mandibular canine and percents

A

70% - one canal
30% - two canals

63
Q

when only one canal present in mandibular canine, it is very wide where

A

bucco-lingually

64
Q

how many canals and percent in mandibular first bicuspid

A

70% one canal
29% two canal

65
Q

T/F: any mandibular tooth is capable of having more than one canal

A

TRUE

66
Q

how many canal and percent of mandibular second bicuspid

A

85% - one canal
12% - two canals
3% - two foramina

67
Q

how many canals/foramina in mandibular first molar MESIAL root

A

Two canals/two foramina 60%
Two canals/one foramina 40%

68
Q

how many canals/foramina in mandibualr first molar DISTAL root

A

One canal 70%
Two canals one foramen 20%
Two canals two foramina 10%

69
Q

how many canals/foramina in mandibular second molar MESIAL root

A

Two canals / two foramina 40%
Two canals / one foramina 35%
One canal 25%

70
Q

how many canals/foramina in mandibular second molar DISTAL root

A

One canal 92%
Two canals / one foramina 5%
two canals / two foramina 3%

71
Q

mandibular second molars have what shaped canals

A

C shaped

72
Q

T/F: Weine’s classification is per tooth not by root?

A

FALSE! it is per ROOT not by tooth

73
Q

T/F: When two canals are present you need to add up the different types
that have two canals to come up with a total number

A

TRUE

74
Q

how do you determine the total number of canals in a tooth

A

count all canals in each root and then add them all up

75
Q

what CBCT view

A

coronal view

76
Q

what CBCT view

A

sagital view

77
Q

what CBCT view

A

axial view

78
Q

A 4th canal is usually present on maxillary molars. Which of the following roots of
maxillary molars contain 2 canals?

A

mesiobuccal root

79
Q

T/F: accessory canals are more frequent on the middle third of the root

A

FALSE! apical third!

80
Q

approximately what pecentage of maxillary 1st premolars have two canals

A

over 90%

81
Q

T/F: the shape of the canal is uniform al throughout the length of the canal

A

FALSE

82
Q

T/F: it is impossible to instrument the entire root canal system

A

TRUE

83
Q

T/F: canals are straight in most teeht

A

FALSE

84
Q

T/F: one of the limitations of radiographs is that it is two dimensional view of a three dimensional object

A

TRUE

85
Q

T/F: furcation lesions can occur due to the presence of furcal canals

A

TRUE

86
Q

T/F: as the patient ages the pulp chamber tends to get smaller

A

TRUE

23 Endodontics (12 decks)

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