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Dental Anatomy > Development/Eruption > Flashcards

Development/Eruption Flashcards

1
Q

When do primary maxillary central incisors erupt? When are they shed?

A

Erupt 8-12 months Shed 6-7 yrs

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2
Q

When do primary maxillary lateral incisors erupt? When are they shed?

A

Erupt 9-13 months Shed 7-8 yrs

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3
Q

When do primary maxillary canines erupt? When are they shed?

A

Erupt 16-22 months Shed 10-12 yrs

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4
Q

When do primary maxillary first molars erupt? When are they shed?

A

Erupt 13-19 months Shed 9-11 yrs

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5
Q

When do primary maxillary second molars erupt? When are they shed?

A

Erupt 25-33 months Shed 10-12 yrs

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6
Q

When do primary mandibular central incisors erupt? When are they shed?

A

Erupt 6-10 months Shed 6-7 yrs

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7
Q

When do primary mandibular lateral incisors erupt? When are they shed?

A

Erupt 10-16 months Shed 7-8 yrs

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8
Q

When do primary mandibular canines erupt? When are they shed?

A

Erupt 17-23 months Shed 9-12 yrs

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9
Q

When do primary mandibular first molars erupt? When are they shed?

A

Erupt 14-18 months Shed 9-11 yrs

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10
Q

When do primary mandibular second molars erupt? When are they shed?

A

Erupt 23-31 months Shed 10-12 yrs

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11
Q

What are succedaneous teeth?

A

Permanent teeth that replace exfoliated deciduous teeth

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12
Q

Describe how the root of anterior and posterior teeth are divided into thirds

A

Apical third (root tip) Middle third Cervical third

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13
Q

Describe how the crown of anterior and posterior teeth are divided into thirds

A

-incisal/occlusal, middle, cervical -mesial, middle, distal -labial/buccal, middle, lingual

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14
Q

Name the 6 line angles found in anterior teeth

A
  1. Mesiolabial
  2. Distolabial
  3. Mesiolingual
  4. Distolingual
  5. Labioincisal
  6. Linguoincisal
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15
Q

Name the 8 line angles found in posterior teeth

A
  1. Mesiobuccal
  2. Distobuccal
  3. Mesiolingual
  4. Distolingual
  5. Mesio-occlusal
  6. Disto-occlusal
  7. Bucco-occlusal
  8. Linguo-occlusal
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16
Q

Name the 4 point angles found in anterior teeth

A
  1. Mesiolabioinscisal
  2. Distolabioincisal
  3. Mesiolinguoincisal
  4. Distolinguoincisal
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17
Q

Name the 4 point angles found in posterior teeth

A
  1. Mesiobucco-occlusal
  2. Distobucco-occlusal
  3. Mesiolinguo-occlusal
  4. Distobucco-occlusal
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18
Q

What are mamelons and in which teeth are they found?

A
  • Small bumps on the incisal ridge of maxillary and mandibular central and lateral incisors (permanent only)
  • Ridge wears into an edge over time, so mamelons are more common in children than adults
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19
Q

Name the depression outlined by the colored lines, and name the protrusion circled in green

A

Lingual fossa and cingulum

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20
Q

What are 4 ways that maxillary lateral incisors exhibit variation?

A
  1. Peg shaped laterals sometimes seen
  2. May be missing
  3. May have a palato-radicular groove-see
  4. May see a large pointed tubercle
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21
Q

What is perikymata?

A

parallel ridges formed by cyclic deposition of enamel

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22
Q

What 3 characteristics can chronolgy play a role in?

A

form, color, and arrangements

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23
Q

what 3 teeth are anomolies most often seen in?

A

maxillary laterals, third molars, and mandibular 2nd premolars

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24
Q

when does enamel hypoplasia develop?

A

during enamel formation

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25
Q

Name the amount of time it takes for primary crown formation to continue after birth for the centrals, laterals, canines, 1st molars, and 2nd molars

A

centrals - 3 months

laterals - 4 months

canines - 8.5 months

1st molars - 7 months

2nd molars - 10.5 months

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26
Q

Is the cementum of permanent teeth thicker or thinner than that of primary teeth?

A

thicker in permanent teeth

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27
Q

When does root formation occur in relation to crown formation?

A

root formation occurs after crown formation

28
Q

What is a function of continued root formation in relation to eruption?

A

continued root formation aids in the tooth erupting and contacting opposites

29
Q

what happens to the roots of primary teeth in the absense of a permanent successor?

A

the root may only partially resorb, possibly resultng in prolonged retention of the primary tooth

30
Q

what happens to alveolar bone height during development in relation to formation of teeth?

A

the alveolar bone height will increase to accomodate the increasing length of the teeth

31
Q

Name the sequence of eruption of the primary teeth

A

1) central incisor
2) lateral incisor
3) 1st molar
4) canine
5) 2nd molar

32
Q

around what age is the emergence of primary dentition usually completed?

A

around 30 months

33
Q

what event marks the beginning of mixed dentition? what event marks the end?

A

the emergence of the mandibular 1st permanent molar marks the beginning of mixed dentition, and the loss of the last primary tooth marks the end (around 11-12 years of age)

34
Q

T or F:

permanent teeth do not begin eruptive movement until the crown is completed

A

true

35
Q

considering 1st molars are not succedaneous teeth (they do not have primary teeth as predecessors), how is their eruption guided?

A

by the distal surface of the primary 2nd molars

36
Q

T or F:

the premature loss of primary teeth due to caries does not effect the development of permanent dentition

A

false

37
Q

T or F:

the premature loss of primary teeth leads to a lack of space for permanent teeth

A

true

38
Q

T or F:

premature loss of primary teeth may lead to occlusion, loss of arch length, and crowding

A

true

39
Q

what are developmental lobes?

A

centers of formation of permanent teeth; there are 4 lobes in each tooth

40
Q

T or F:

follicles of developing incisors and canines are labial to deciduous roots

A

false

they are lingual to deciduous roots

41
Q

in relation to primary molars, where are follicles of permanent premolars located?

A

in the bifurcation of deciduous roots

42
Q

what do permanent incisors, canines, and premolars have in common?

A

they are all succedaneous teeth; they take place of their primary predeccessors

43
Q

in general, do teeth in the mandibular arch emerge before or after those of the maxilla?

A

before

44
Q

T or F:

size of teeth are not genetically or racially determined

A

false

45
Q

what does pulp get smaller with age?

A

due to deposition of secondary dentin

46
Q

4 types of cementoenamel junction

A

1) enamel overlaps cementum
2) end to end
3) gap exposing dentin
4) cementum overlaps enamel

47
Q

T or F:

while teeth are forming, very little environmental influences will affect teeth

A

true, BUT:

tetracycline can cause brown-bluish color, and fluoride can either make enamel less susceptible to caries or cause fluorosis (excess fluoride)

48
Q

T or F:

mandibular incisors have the smallest mesiodistal dimensions of all teeth

A

true

49
Q

in what direction is masticatory stress in the mandibular central?

A

labio-lingual direction

50
Q

T or F:

mandibular central incisor root is wide mesiodistal and narrow labiolingual

A

false

the root is narrow mesiodistal and wide labiolingual

51
Q

is the length of the mandibular central incisor root longer than the maxillary central incisor?

A

it is as long, and sometimes longer than the maxillary central incisor

52
Q

T or F:

in the mandibular central incisor, the mesial cervical line curvature is almost 1/2 the length of the crown

A

false

curvature is almost 1/3 the length of the crown

53
Q

what is an important identification mark to separate the mandibular central and lateral incisors?

A

the mandibular central incisor’s incisal edge is almost at right angles with labiolingual bisecting line

54
Q

T or F:

in the mandibular central incisor, the labiolingual dimension is always greater than the mesiodistal dimension

A

true

55
Q

T or F:

in mandibular central incisor roots, two canals may be present

A

true

the root section is often ribbon-like, and sometimes two canals may be present

56
Q

relative to the mandibular central incisor, is the mandibular lateral incisor root longer or shorter?

A

longer

57
Q

in the mandibular lateral incisor, why does the crown appear to be twisted from an incisal view?

A

the incisal edge is curved to follow the curvature of the arch

58
Q

at what age is the peak attack of caries most common?

A

around age 13 when there are only about 5% of primary teeth left

59
Q

after primary teeth are completely finished, about how long is it before tooth resorption begins?

A

1-2 years

60
Q

T or F:

primary teeth are usually more yellow than permanent teeth

A

false

primary teeth are less pigmented than permanent teeth, giving them a whiter appearance

61
Q

describe characteristics of roots of primary molars

A

they are longer and flare more so that permanent premolars can develop between them

62
Q

compare enamel, dentin, and pulp of primary teeth to permanent teeth

A

enamel in primary teeth is thin with a consistent depth

dentin in thin

pulp horns are high and chamber is large

63
Q

compare the mesiodistal vs cervicoincisal measurements in maxillary central incisors of primary and permanent dentition

A

primary dentition:

mesioincisal length is longer than cervicoincisal length

permanent dentition:

mesioincisal length is shorter than cervicoincisal length

64
Q

T or F:

cervical ridges are more pronounced in permanent maxillary central incisors than in primary maxillary central incisors

A

false

cervical ridges are more pronounced in primary maxillary central incisors

65
Q

T or F:

the primary maxillary lateral incisor’s mesiodistal length is shorter than its cervicoincisal length

A

true

66
Q

which primary tooth has an appearance of a tooth on steroids?

A

maxillary canine

67
Q

what is the purpose of the primary mandibular central incisor labiolingual measurement being only 1mm smaller than that of the primary maxillary central incisor?

A

for strength

Dental Anatomy (11 decks)

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