Development of Primary Teeth - Sorenson

Question 1

what is the primate space for each arch?

Answer 1

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

there is also a space between the maxillary lateral and canine

Question 2

What is leeway space?

Answer 2

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

Question 3

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

initiation
proliferation
histodifferentiation and Morphodifferentiation
apposition and calcification

Answer 3

bud stage

cap stage

bell stage

(didn’t specify)

Question 4

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

that early tooth development is recognized because what happens

Answer 4

6th week

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

Question 5

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

Answer 5

a missing tooth

Question 6

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

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

Answer 6

True

from the buds of the primary predecessors

Question 7

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

Answer 7

true

Question 8

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

Answer 8

supernumerary teeth

Question 9

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

Answer 9

no

Question 10

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

Answer 10

proliferation (cap stage)

Question 11

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

Answer 11

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

OR

a cyst can develop

Question 12

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

Answer 12

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

Question 13

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

Answer 13

Histodifferentiation and Morphodifferentiation (bell stage)

Question 14

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

Answer 14

Morphodifferentiation stage (bell stage)

Question 15

what causes peg laterals

Answer 15

genetics

Question 16

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

Answer 16

apposition and calcification stage

Question 17

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

Answer 17

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

Question 18

How does calcification occur?

Answer 18

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)

Question 19

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?

Answer 19

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

Question 20

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

Answer 20

second primary molar and first permanent molar

Question 21

What is the general calcification sequence?

Answer 21

central incisor
first primary molar
lateral incisor
Canine
Second Primary molar
first permanent molar

Question 22

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

Answer 22

true

Question 23

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

Answer 23

true

Question 24

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

Answer 24

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

true

Question 25

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

Answer 25

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

Question 26

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

Answer 26

True

Question 27

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

Answer 27

all dimensions except labio-lingually

Question 28

Mandibular Canine What are the differences between this and the maxillary canine?

Answer 28

the crown is slightly shorter root is about 2mm shorter smaller labio-lingually longer slope of cusp is distal

Question 29

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?

Answer 29

the mesiodistal contact areas long

Question 30

What molar is very susceptible to decay in primary teeth?

Answer 30

Maxillary first molar

Question 31

what tooth looks most like the maxillary second primary molar?

Answer 31

the maxillary first permanent molar

Question 32

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

Answer 32

larger

Question 33

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

Answer 33

the lingual root

Question 34

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

Answer 34

2 on buccal 3 on lingual

Question 35

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

Answer 35

primary mandibular first molar

Question 36

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?

Answer 36

rhomboid the pulp horns are huge

Question 37

which molars decay all the time in children?

Answer 37

primary maxillary and mandibular 1st molars

Question 38

in a clinically relevant sense, the pulp horns of primary teeth are largest when? what causes the pulp to decrease in size?

Answer 38

when they first erupt. age, function, and abrasion

Question 39

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

Answer 39

False - primary teeth bond worse

Question 40

T/F primary teeth have a greater crown to root ratio that permanent teeth

Answer 40

False - the opposite is true

Question 41

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

Answer 41

True

Question 42

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

Answer 42

1/2

Question 43

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

Answer 43

occlusally

Question 44

The primary molars have a pronounced what?

Answer 44

buccal cervical bulge

Question 45

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

Answer 45

False - they are more flat and broad

Question 46

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

Answer 46

false - they are typically whiter and a lighter shade

Question 47

why do roots of primary teeth have more flare?

Answer 47

to accommodate the developing crowns of the permanent premolars

Question 48

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

Answer 48

True

Question 49

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

Answer 49

True

Question 50

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

Answer 50

mesial

Question 51

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

Answer 51

primary mandibular molars

Question 52

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

Answer 52

true

Question 53

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

Answer 53

False - they have no developmental grooves or mammelons

Question 54

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

Answer 54

the roots can break

Question 55

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

Answer 55

narrower

Question 56

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

Answer 56

true

Question 57

T/F the pulp chambers are wider in children

Answer 57

true

Question 58

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

Answer 58

true