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Pedodontics > Development of Primary Teeth - Sorenson > Flashcards

Development of Primary Teeth - Sorenson Flashcards

1
Q

what is the primate space for each arch?

A

there is typically a space between the mandibular canine and first molar

there is also a space between the maxillary lateral and canine

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2
Q

What is leeway space?

A

the sum of posterior teeth lengths in the mesio-distal direction in the primary dentition is greater than the sum of the first 3 posterior teeth in the permanent dentition so when permanent teeth erupts

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3
Q

these each refer to which stage of the developmental staging of the tooth?

initiation
proliferation
histodifferentiation and Morphodifferentiation
apposition and calcification

A

bud stage

cap stage

bell stage

(didn’t specify)

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4
Q

Tooth development can be seen as early as the ________ week of embryonic life

that early tooth development is recognized because what happens

A

6th week

epithelial thickening in the area of the future dental arch which eventually becomes the dental lamina

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5
Q

If a dental lamina is disturbed, what may be the consequence?

A

a missing tooth

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6
Q

T/F The permanent molars, like the primary teeth arise from the dental lamina

Where do permanent incisors, canines, and premolars arise from?

A

True

from the buds of the primary predecessors

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7
Q

T/F congenital absence of a tooth is a result of a lack of initiation or an arrest in the proliferation of cells

A

true

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8
Q

____________ ___________ is the result of continuing budding of the enamel organ

A

supernumerary teeth

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9
Q

if a primary incisor, canine, or molar tooth bud does not form, will the child have the corresponding permanent teeth that erupt underneath?

A

no

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10
Q

the inner and out enamel epithelium is formed at what stage of tooth development?

A

proliferation (cap stage)

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11
Q

if the cells during the proliferation stage become more fully differentiated or detached from the enamel organ what happens?

A

those cells will produce enamel and dentin which results in an odontoma or supernumerary tooth

OR

a cyst can develop

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12
Q

Why would you take out a tooth and its associated odontoma?

A

because it may stop or slow the eruption of the permanent tooth

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13
Q

In what stage do cells of the dental papilla differentiate into ameloblasts?

A

Histodifferentiation and Morphodifferentiation (bell stage)

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14
Q

disturbances and aberrations in what stage lead to abnormal forms and size of teeth?

A

Morphodifferentiation stage (bell stage)

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15
Q

what causes peg laterals

A

genetics

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16
Q

Amelogenesis imperfecta and dentinogenesis imperfecta problems start happening at what stage?

A

apposition and calcification stage

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17
Q

any systemic disturbance or local trauma that injures ameloblasts during the apposition phase will cause what?

A

an interuption or an arrest in the matrix apposition which causes ENAMEL HYPOPLASIA

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18
Q

How does calcification occur?

A

cells make a small enucleation site called a nidus and precipitation of inorganic calcium salts deposit starting there. (He talked about these growth centers being like a bunch of golf balls)

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19
Q

tooth development starts at about 6 weeks in utero

When do Primary central incisors start to look like a tooth?
laterals?
canines?
Man 1st
Max 1st
Man 2nd
Max 2nd

When do they start to calcify?

A

All values are values in utero

Centrals: 11 weeks in utero - 14 weeks
Laterals: 13-14 weeks in utero - 16 weeks
Canines: 14-16 weeks in utero - 17 weeks
Man 1st: 12 weeks - 15.5 weeks
Max 1st: 12.5 weeks - 15.5 weeks
Man 2nd: 12.5 weeks - 18 weeks
Max 2nd: 12.5 weeks - 19 weeks

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20
Q

According to some researchers the second primary molar and what other tooth undergo identical patterns of morphodifferentiation but at different times?

A

second primary molar and first permanent molar

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21
Q

What is the general calcification sequence?

A 
central incisor
first primary molar
lateral incisor
Canine
Second Primary molar
first permanent molar
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22
Q

T/F the mesiodistal width of the crown of the maxillary central incisor is greater than the cervico-incisal length

A

true

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23
Q

T/F in the primary maxillary central incisor, the incisal edge is nearly straight even before abrasion becomes evident

A

true

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24
Q

Max lateral incisor

T/F the outline of the maxillary lateral incisor is not similar to that of the central incisor.

T/F the length of the crown from the cervical to incisal edge is greater than the mesiodistal width

A

false - it is pretty much the same tooth shape just a smaller size

true

25
Q

Max canine

T/F the canine has a long, slender, tapering root that is more than three times the length of the crown

A

False - it is more than twice the lenghth of the crown

26
Q

Man Central Incisor

T/F The mandibular central incisor is smaller than the maxillary central incisor but its labiolingual measurement is usually only 1 mm less

A

True

27
Q

Mandibular lateral incisor

The outline of the mandibular lateral incisor is similar to that of the central incisor but is larger in which dimensions?

A

all dimensions except labio-lingually

28
Q

Mandibular Canine

What are the differences between this and the maxillary canine?

A

the crown is slightly shorter

root is about 2mm shorter

smaller labio-lingually

longer slope of cusp is distal

29
Q

Max first primary molar

the greatest dimension of the crown of the maxillary first molar is where?

How many roots are there? Are they long or short?

A

the mesiodistal contact areas

long

30
Q

What molar is very susceptible to decay in primary teeth?

A

Maxillary first molar

31
Q

what tooth looks most like the maxillary second primary molar?

A

the maxillary first permanent molar

32
Q

the 2nd primary molar is (larger/smaller) than the primary 1st molar

A

larger

33
Q

What is the largest root on the maxillary second primary molar?

A

the lingual root

34
Q

HOw many cusps does the maxillary second primary molar have on the buccal?

lingual?

A

2 on buccal

3 on lingual

35
Q

Which primary molar doesn’t resemble any of the permanent teeth?

A

primary mandibular first molar

36
Q

The primary mandibular first molar has what general shape looking at it from the occlusal view

What about the pulp should we know in this tooth?

A

rhomboid

the pulp horns are huge

37
Q

which molars decay all the time in children?

A

primary maxillary and mandibular 1st molars

38
Q

in a clinically relevant sense, the pulp horns of primary teeth are largest when?

what causes the pulp to decrease in size?

A

when they first erupt.

age, function, and abrasion

39
Q

T/F primary teeth bond to about the same degree that permanent teeth so giving retention form to restorations is not a big deal

A

False - primary teeth bond worse

40
Q

T/F

primary teeth have a greater crown to root ratio that permanent teeth

A

False - the opposite is true

41
Q

T/F the occlusal tables of primary molars are constricted buccolingually and much narrower mesiodistally when compared with those of the permanent molars

A

True

42
Q

enamel and dentin in primary teeth are about what fraction of the thickness of the same layers in permanent teeth?

A

1/2

43
Q

the enamel rods of permanent teeth point apically in the cervical 1/3 of the crown. Which direction do they point in primary teeth?

A

occlusally

44
Q

The primary molars have a pronounced what?

A

buccal cervical bulge

45
Q

T/F contact areas on primary teeth are more narrow and small compared to that of permanent teeth

A

False - they are more flat and broad

46
Q

T/F primary teeth are typically more yellow than their permanent counterparts

A

false - they are typically whiter and a lighter shade

47
Q

why do roots of primary teeth have more flare?

A

to accommodate the developing crowns of the permanent premolars

48
Q

T/F the mesiodistal width of the roots of primary anterior teeth is much narrower than the crown when compared with those of the permanent dentition

A

True

49
Q

T/F primary molar roots are relatively longer and more slender than permanent roots

A

True

50
Q

which pulp horns are typically closer to the enamel in primary teeth, distal or mesial?

A

mesial

51
Q

which primary teeth have larger pulp horns, maxillary molars or mandibular molars?

A

primary mandibular molars

52
Q

root canals in primary teeth are extremely tortuous and complex. T/F

A

true

53
Q

T/F incisors of the primary teeth have 2 mammelons each and associated developmental grooves

A

False - they have no developmental grooves or mammelons

54
Q

because primary molar roots are flared what is more likely to happen to them during extraction?

A

the roots can break

55
Q

Roots on primary teeth are (narrower/broader) in a mesiodistal direction than the same roots are in permanent teeth.

A

narrower

56
Q

Accessory canal are often present in primary root pulp T/F

A

true

57
Q

T/F the pulp chambers are wider in children

A

true

58
Q

T/F the root pulp of primary teeth is more ribbon like than in permanent teeth

A

true

Pedodontics (9 decks)

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