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Dental Anatomy > Exam 1 Review > Flashcards

Exam 1 Review Flashcards

1
Q

The surfaces of teeth facing toward the adjoining or adjacent teeth in the same arch are called:

A

proximal surfaces

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2
Q

The surfaces of teeth that are parallel to the long axis of the tooth are called:

A

axial surfaces

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3
Q

What are the 4 axial surfaces of a tooth?

A

mesial
distal
facial
lingual

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4
Q

In an oblique ridge there is a union of the ________ ridge of the _________ cusp and the _______ cusp ridge of the ___________ cusp across the facial-lingual perimeter on the occlusal surface

A

In an oblique ridge there is a union of the triangular ridge of the distofacial cusp and the distal cusp ridge of the mesiolingual cusp across the facial-lingual perimeter of the occlusal surface

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5
Q

What is a valley or depression on the surface of a tooth between two ridges and or cusps of which the inclines meet at an angle?

A

sulcus

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6
Q

T/F a sulcus is a groove

A

False - a sulcus is a depression or a space

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7
Q

What is the last tooth to begin calcification? At what age?

A

Primary maxillary second molar (A&J) at 19 weeks in utero

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8
Q

First evidence of calcification has occurred by what week in utero?

A

week 20

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9
Q

What is the last primary tooth to exfoliate? At what age?

A

primary maxillary second molar at 11 years

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10
Q

What permanent tooth replaces the primary maxillary second molar?

A

permanent maxillary second premolar

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11
Q

What are the first permanent teeth to erupt? At what age?

A

1st molars at 6 years of age (#3, 14, 19, 30)

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12
Q

What is the first permanent roots to completely form? At what age?

A

1st molars and central incisors at 9 years

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13
Q

All permanent incisor tooth roots have completely formed by _____ years of age

A

11

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14
Q

What anatomical structure is only on permanent mandibular molars and is considered an overdevelopment of either the distal cusp ridge of the mesiolingual cusp or the mesial cusp ridge of the distolingual cusp?

A

Tuberculum Intermedium

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15
Q

Why is it important to have a curved plane of occlusion versus a flat plane?

A

Curved plane of occlusion permits maximum use of tooth contacts during function

A flat plane has too many contacts on most posterior teeth

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16
Q

What is the only mandibular anterior teeth proximal contact area to be located in the middle third? (all others are at the incisal third)

A

distal of canine

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17
Q

Where is the mandibular anterior proximal contact most incisal?

A

at the midline

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18
Q

What is the height of contour of the following?
A. mandibular anterior teeth
B. mandibular first premolar
C. mandibular second premolar
D. mandibular molars
E. all facial surfaces of the mandibular arch

A 
A. 0.5 mm at cervical third
B. 0.5 mm at middle third
C. 0.75 mm at middle third
D. 1 mm at middle third
E. 0.5 mm at cervical third
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19
Q

What are the 8 types of periodontal fibers?

A
  1. gingival
  2. alveolar crest
  3. horizontal
  4. oblique
  5. periapical
  6. interradicular
  7. transseptal
  8. circumferential
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20
Q

What periodontal fiber resists forceful impaction of a tooth into the alveolus?

A

oblique fibers

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21
Q

What periodontal fibers help maintain contiguous proximal contact?

A

transseptal

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22
Q

When is an embrasure created?

A

when two teeth in the same arch exhibit proximal contact with each other

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23
Q

T/F an embrasure can exist in a patient with a diastema

A

True - between the proximal contact

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24
Q

How many embrasures are there in an ideal embrasure construct?

A

4

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25
Q

On permanent maxillary first molars are embrasures smaller on the facial or lingual side?

A

lingual are smaller than facial b/c crown tapers to the facial

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26
Q 
How do the following compare in primary vs. permanent molars: 
A. enamel 
B. dentin thickness
C. pulp horns 
D. pulp chambers 
E. Enamel rod positioning
A

A. primary enamel thinner than permanent
B. primary dentin thinner than permanent
C. primary pulp horns are taller
D. primary pulp chambers are larger
E. primary enamel rods in cervical third are positioned occlusally, permanent are positioned apically

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27
Q

On a primary maxillary lateral incisor where does the incisal ridge curve towards?

A

curves towards the facial surface

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28
Q

What is the smallest cusp on a primary maxillary first molar from a lingual view?

A

distolingual cusp

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29
Q

On a primary mandibular first molar which cusp is larger and taller: mesiofacial or distofacial?

A

mesiofacial cusp is larger

30
Q

On a primary mandibular first molar which root is longer and straighter: mesial or distal?

31
Q

A primary mandibular second molar has what 2 distinct grooves?

A

mesial marginal ridge groove

central developmental groove

32
Q

T/F the distal marginal ridge has a notch instead of a groove that splits it into 2 segments

33
Q

Does a primary mandibular second molar have a transverse ridge?

34
Q

What is the most common location for a supernumerary tooth?

A

mandibular second premolar

35
Q

What tooth structure is shared in a tooth fusion?

36
Q

What teeth most commonly exhibit tooth fusion?

A

maxillary second and third molars

37
Q

Why is a permanent maxillary central incisor easily extracted?

A

the root is cone shaped with a blunt apex

38
Q

What is the crown length and width of the permanent maxillary lateral incisor as compared to the maxillary central incisor?

A

Length: 1.0 - 1.5 mm shorter than maxillary central incisor

Width: 2.0 mm shorter than maxillary central incisor

39
Q

What is the shape of root apex on a permanent maxillary lateral incisor?

A

distally curved

40
Q

T/F the incisal ridge and root apex line up in a permanent maxillary lateral incisor

A

False - they are not in line with each other b/c of the apex of the root

41
Q

Permanent mandibular central incisal ridge is located where?

A

towards the lingual, over the crown and main body of the root

42
Q

Crown facial/lingual profiles

A

Enamel on the facial surface is slightly apical

43
Q

On a mandibular lateral incisor the incisal edge is _______ on the mesial but ________ towards the distal

A

straight on the mesial

slants towards the distal

44
Q

Which line angle on a mandibular lateral incisor is more sharp? more rounded?

A

More sharp: mesial

More rounded: distal

45
Q

On a mandibular lateral incisor what surface does the incisal ridge lean towards?

A

lingual surface

46
Q

On a permanent maxillary canine, where is the location of the cusp tip?

A

slightly mesial (could be in line)

47
Q

Which cusp ridge is longer on a permanent maxillary canine: mesial or distal?

A

distal is longer than mesial

48
Q

The root on a permanent maxillary canine has a slight ________ curvature or it could even be straight

49
Q

On a permanent maxillary canine what is the cusp tip aligned with?

A

root tip and high of curvature cervical line

50
Q

Where is there a pronounced concavity on a permanent maxillary canine?

A

Distofacial cervical third

51
Q

On a permanent mandibular canine the cusp tip is _______ to the faciolingual bisector

52
Q

On a permanent maxillary first premolar which cusp tip is less pointed and shorter?

A

lingual is less pointed and 1.0 mm shorter than facial

53
Q

On a permanent maxillary first premolar which cusp tip is more mesial?

54
Q

Which cuspal ridge is shorter on a permanent maxillary first premolar?

A

mesial cuspal ridge is shorter than distal cuspal ridge

55
Q

The mesial marginal ridge is ________ to the faciolingual long axis bisector in a permanent maxillary first premolar

A

perpendicular

56
Q

What does the mesial marginal developmental groove divide?

A

divides the crest of the mesial marginal ridge into a facial and lingual segment

57
Q

The crest of the lingual segment lingually is ________ to the mesiodistal bisector of the crown in a permanent maxillary first premolar

58
Q

On a permanent maxillary first premolar the facial cusp tip is _______ to the mesiodistal bisector and _______ the distance from the facial outline to the faciolingual bisector of the crown

A

distal

1/3

59
Q

On a lingual surface what tooth has lingual and facial cusps of about equal height/angulation?

A

permanent maxillary second premolar

60
Q

how many triangular fossae are on a permanent maxillary second premolar?

A

2 - mesial and distal (that are close to the center of the tooth)

61
Q

A permanent maxillary second premolar has a ________ central groove and _____ marginal ridges

A

short central groove

wide marginal ridges

62
Q

The lingual cusp on a permanent mandibular first premolar is ____ the height of the facial cusp

63
Q

The lingual cusp on a permanent mandibular first premolar can be described as what?

A

pointed and centered

64
Q

What is the angle to the crest of the mesial marginal ridge on a permanent mandibular first premolar?

A

45 degrees

65
Q

The central groove on a permanent mandibular first premolar is on the ______ portion of the crown

66
Q

Which groove on a permanent mandibular first premolar is linear in shape? What is it continuous with?

A

mesial groove

continuous with the mesiolingual groove

67
Q

What is the shape of the distal triangular fossa in a permanent mandibular first premolar?

A

comma shaped

68
Q

What side does the central groove on a permanent mandibular first premolar bend towards?

69
Q

What are the 3 cusps on a permanent mandibular second premolar and their measurements?

A

faciolingual

mesiolingual: 1.5 mm shorter than facial
distolingual: 2.0 mm shorter

70
Q

The lingual groove on a permanent mandibular second premolar is positioned to what side?

71
Q

The developmental grooves on the permanent mandibular second premolar form what shape?

A

“Y” shaped

72
Q

T/F the three cusp variety on a permanent mandibular second premolar does have a transverse ridge

A

False - it does not have a transverse ridge

Dental Anatomy (12 decks)

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