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Flashcards in Development/Eruption Deck (67):
1

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

Erupt 8-12 months Shed 6-7 yrs

2

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

Erupt 9-13 months Shed 7-8 yrs

3

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

Erupt 16-22 months Shed 10-12 yrs

4

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

Erupt 13-19 months Shed 9-11 yrs

5

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

Erupt 25-33 months Shed 10-12 yrs

6

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

Erupt 6-10 months Shed 6-7 yrs

7

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

Erupt 10-16 months Shed 7-8 yrs

8

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

Erupt 17-23 months Shed 9-12 yrs

9

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

Erupt 14-18 months Shed 9-11 yrs

10

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

Erupt 23-31 months Shed 10-12 yrs

11

What are succedaneous teeth?

Permanent teeth that replace exfoliated deciduous teeth

12

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

Apical third (root tip) Middle third Cervical third

13

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

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

14

Name the 6 line angles found in anterior teeth

 

Q image thumb

1.Mesiolabial

2.Distolabial 

3.Mesiolingual

4.Distolingual

5.Labioincisal

6.Linguoincisal

15

Name the 8 line angles found in posterior teeth

Q image thumb

1.Mesiobuccal

2.Distobuccal

3.Mesiolingual

4.Distolingual

5.Mesio-occlusal

6.Disto-occlusal

7.Bucco-occlusal

8.Linguo-occlusal

16

Name the 4 point angles found in anterior teeth

Q image thumb

1.Mesiolabioinscisal

2.Distolabioincisal

3.Mesiolinguoincisal

4.Distolinguoincisal

17

Name the 4 point angles found in posterior teeth

Q image thumb

1.Mesiobucco-occlusal

2.Distobucco-occlusal

3.Mesiolinguo-occlusal

4.Distobucco-occlusal

18

What are mamelons and in which teeth are they found?

-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

19

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

Q image thumb

Lingual fossa and cingulum

20

What are 4 ways that maxillary lateral incisors exhibit variation?

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 

21

What is perikymata?

parallel ridges formed by cyclic deposition of enamel

22

What 3 characteristics can chronolgy play a role in?

form, color, and arrangements

23

what 3 teeth are anomolies most often seen in?

maxillary laterals, third molars, and mandibular 2nd premolars

24

when does enamel hypoplasia develop?

during enamel formation

25

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

centrals - 3 months

laterals - 4 months

canines - 8.5 months

1st molars - 7 months

2nd molars - 10.5 months

26

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

thicker in permanent teeth

27

When does root formation occur in relation to crown formation?

root formation occurs after crown formation

28

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

continued root formation aids in the tooth erupting and contacting opposites

29

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

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

30

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

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

31

Name the sequence of eruption of the primary teeth

1) central incisor

2) lateral incisor

3) 1st molar

4) canine

5) 2nd molar

32

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

around 30 months

33

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

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

T or F: 

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

true

35

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

by the distal surface of the primary 2nd molars

36

T or F:

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

false

37

T or F:

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

true

38

T or F:

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

true

39

what are developmental lobes?

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

40

T or F:

follicles of developing incisors and canines are labial to deciduous roots

false

they are lingual to deciduous roots

41

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

in the bifurcation of deciduous roots

42

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

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

43

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

before

44

T or F:

size of teeth are not genetically or racially determined

false

45

what does pulp get smaller with age?

due to deposition of secondary dentin

46

4 types of cementoenamel junction

1) enamel overlaps cementum

2) end to end

3) gap exposing dentin

4) cementum overlaps enamel

47

T or F:

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

true, BUT:

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

48

T or F:

mandibular incisors have the smallest mesiodistal dimensions of all teeth

true

49

in what direction is masticatory stress in the mandibular central?

labio-lingual direction

50

T or F:

mandibular central incisor root is wide mesiodistal and narrow labiolingual

false

the root is narrow mesiodistal and wide labiolingual

51

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

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

52

T or F:

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

false

curvature is almost 1/3 the length of the crown

53

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

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

54

T or F:

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

true

55

T or F:

in mandibular central incisor roots, two canals may be present

true

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

56

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

longer

57

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

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

58

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

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

59

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

1-2 years

60

T or F:

primary teeth are usually more yellow than permanent teeth

false

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

61

describe characteristics of roots of primary molars

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

62

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

enamel in primary teeth is thin with a consistent depth

dentin in thin

pulp horns are high and chamber is large

63

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

primary dentition: 

mesioincisal length is longer than cervicoincisal length

permanent dentition:

mesioincisal length is shorter than cervicoincisal length

64

T or F:

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

false

cervical ridges are more pronounced in primary maxillary central incisors 

65

T or F:

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

true

66

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

maxillary canine

67

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

for strength