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NBDE PART I > Dental Anatomy > Flashcards

Dental Anatomy Flashcards

1
Q

Contact area of max central incisors (M and D)

A

M - incisal 1/3

D - Junction of incisal & middle 1/3

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2
Q

Contact area of max lateral incisors (M and D)

A

M - Junction of incisal & middle 1/3

D - Middle 1/3

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3
Q

Contact area of max canine (M and D)

A

M - Junction of incisal & middle 1/3

D - Middle 1/3

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4
Q

Contact area of mand central incisors and lateral incisors (M and D)

A

M - Incisal 1/3

D - Incisal 1/3

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5
Q

Contact area of mand canine (M and D)

A

M - Incisal 1/3

D - Middle 1/3

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6
Q

GENERALLY, where is the occlusocervical contact area on posterior teeth? and what are the 2 exceptions?

A

Middle 1/3 (M contact more occlusally) (slightly wider F/L)
Exception :
1. Mand 1st premolar M contact which is more cervical due to sloped MMR
2. Max and mand molars M contacts are at junction of occl and middle 1/3

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7
Q

GENERALLY, where is the faciolingual proximal contact area located?

A

Middle 1/3 (posterior teeth slightly more facial)

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8
Q

Facial heights of contour aka cervical ridges are most prominent where?

A

Mand posterior teeth

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9
Q

Lingual heights of contour are found where on anterior and posterior teeth? What is the Exception?

A

Anterior - cervical 1/3
Posterior - middle 1/3
Exception - Mand 2nd premolar - occl 1/3

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10
Q

CEJ dips most on what surfaces? What tooth has the most and least severe curvature?

A

Dips more on anterior, mesial, maxillary teeth
Most - max Central incisors
Least - mand 3rd molars

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11
Q

Lingual embrasures are wider than facial embrasures on all permanent teeth bc of FL convergence. What are the 3 exceptions?

A
  1. Max 1st molar
  2. Mand 2nd premolar 3-cusp variety
  3. Mand central incisors (same size embrasures also smallest)
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12
Q

Top 5 largest incisal embrasures

A
  1. Max lateral incisors and canine
  2. Mand lateral incisors and canine
  3. Max central and lateral incisors
  4. Max central incisors
  5. Mand central and lateral incisors
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13
Q

Largest occl embrasure

A

Max canine and 1st premolar

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14
Q

When is the first evidence of calcification of primary teeth in utero

A

14 weeks

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15
Q

When is the calcification of all primary crowns complete and what tooth is last?

A

11 months

Max 2nd molars

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16
Q

What primary teeth erupt first and which erupt last and at what age?

A

1st mand central incisors @ 10 months

Last max 2nd molars @ 29 months

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17
Q

When are all the roots of primary teeth completely formed and what tooth is last?

A

39 months

Max canines last

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18
Q

What permanent teeth are the first to initiate calcification and when does that begin?

A

1st molars - At birth

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19
Q

Permanent mand teeth usually erupt before their max counterparts except what tooth?

A

Max 2nd premolar - which may erupt at the same time or before the mand 1st premolar

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20
Q

What permanent teeth are first to erupt and at what age?

A

1st molars @ 6 years (mixed dentition phase begins)

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21
Q

What teeth are last to initiate calcification and at what age?

A

3rd molars at 9 years

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22
Q

From the facial or lingual, all teeth are what shape?

A

Trapezoidal

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23
Q

From a proximal view, what shape are anterior, max posterior, and mand posterior teeth?

A

Anterior - Triangular
Max posterior - Trapezoidal
Mand posterior - Rhomboidal

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24
Q

What is the max incisors incisal edge orientation?

A

Centered over the long axis bisector of the tooth

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25
Q

What is the max canines incisal edge orientation?

A

Centered or slightly facial, never lingual

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26
Q

What is the mand incisors incisal edge orientation?

A

Lingual to the long-axis bisector of the tooth

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27
Q

What is the mand canines incisal edge orientation?

A

Lingual to the long-axis bisector of the tooth

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28
Q

Generally on teeth with 1 facial cusp, the mesial cusp ridge is slightly shorter than the distal cusp ridge, what are the 2 exceptions?

A
  1. Max 1st premolar

2. primary max canine

29
Q

Crowns of teeth when measured occlusocervically tend to get ______ from canine to the 3rd molar.

A

Shorter

30
Q

All teeth develop from 4 lobes, what are the 3 exceptions (that develop from 5 lobes)?

A
  1. permanent max 1st molar (due to cusp of carabelli)
  2. permanent mand 1st molar
  3. 3 cusp mand 2nd premolar
31
Q

Generally, the ____ portion of a tooth is better developed and measures more occlusocervically as well as cervicoapically than does the _____ portion.

A

Mesial

Distal

32
Q

Generally, the more posterior the tooth, there is the likelihood for it to have _____ supplemental anatomy

A

MORE (aka tertiary anatomy)

33
Q

On molars, which cusp will be the largest?

A

M supporting cusp
Max - ML
Mand - MF

34
Q

Generally, the roots of all teeth are inclined _____

A

Distally

35
Q

If a single root has 2 canals, they will be oriented which ways?

A

one facial and one lingual

36
Q

Where is the widest portion of the pulp chamber?

A

Pulp chamber follows the overall outline of the crown so it will correlate to the widest portion of the crown

37
Q

Molars have how many pulp horns?

A

Same as the number of crown cusps (4)

38
Q

Name 5 single molar roots with more than 1 canal

A
  1. Max 1st molar - MF root
  2. Mand. 1st molar - M root
  3. Mand 2nd molar - M root
  4. Mand 1st molar - D root (31.6%)
  5. Mand 2nd molar - D root (14.9%)
39
Q

Name 3 single anterior roots with tendencies for more than 1 canal

A
  1. Mand. canine (also most likely for bifurcation)
  2. Mand. lateral incisor
  3. Mand central incisors
    (MAX ANTERIOR TEETH DO NOT HAVE MULTIPLE CANALS)
40
Q

What premolar is mostly likely to have 1 root and 1 canal?

A

Mand 2nd

41
Q

What is the only tooth with a pulp wider MD than FL?

A

Max central incisors

42
Q

Why do max centrals and lateral incisors have triangular pulp chambers when viewed in cross section?

A

Significant FL taper

43
Q

What are the possibilities of 1st max premolars roots/canals?

A

2 canals always and 2 roots usually

Rarely 3 but if so, MF, DF, L

44
Q

What is the most common pulp morphology for max 2nd premolars?

A

2 canals and occasionally 2 roots

45
Q

Widest tooth M/D

A

Mand 1st molar

46
Q

Widest primary tooth M/D

A

Mand 2nd molar

47
Q

Widest anterior tooth M/D

A

Max central incisor

48
Q

Widest tooth F/L

A

Max 1st molar

49
Q

Widest primary tooth F/L

A

Max 2nd molar

50
Q

Widest anterior tooth F/L

A

Max Canine

51
Q

3 teeth to measure wider lingually than facially

A
  1. Primary max 2nd molar
  2. Permanent max 1st molar
  3. 3 cusp variety mand. 2nd premolar
52
Q

2 longest teeth

A
  1. Max canine

2. Mand canine

53
Q

Longest root

A

Max canine

54
Q

3 tallest crowns incisogingivally

A
  1. Mand. canine
  2. Max central incisor
  3. Max canine
55
Q

Max lateral incisors most likely to have anomalies, what 5 anomalies are most common?

A
  1. dens in dente
  2. congenitally missing
  3. microdontia
  4. peg lateral
  5. supernumerary
56
Q

Where is the most common location for a supernumerary?

A

Mesiodens - between max central incisors

57
Q

What is the most common premolar to be congenitally missing?

A

Mand 2nd premolar

58
Q

What is the most common tooth to be congenitally missing or malformed?

A

3rd molars

59
Q

Tooth with the smallest anatomical crown

A

mand central incisor

60
Q

anterior tooth with the most symmetrical anatomical crown

A

mand central incisor

61
Q

Posterior tooth with the most symmetrical anatomical crown

A

max 2nd premolar

62
Q

Tooth with the narrowest M/D measurement

A

Mand central incisor

63
Q

Tooth with the best developed lingual anatomy

A

max lateral incisors

64
Q

Only tooth with a linguogingival groove

A

Max lateral incisor

65
Q

Only tooth with a mesiolingual groove

A

mand 1st premolar

66
Q

only tooth with a M marginal developmental groove

A

max 1st premolar (max molars may have supplemental marginal grooves)

67
Q

Concrescence: the cementum of 2 proximal teeth is fused together, when seen, what teeth does it usually involve?

A

2nd and 3rd molars or in anterior teeth

68
Q

Top 3 teeth most frequently impacted

A
  1. 3rd molars
  2. max canines
  3. mand 2nd premolars

NBDE PART I (10 decks)

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