Ch 6 Sec 1&2

Question 1

Another name for primary teeth

Answer 1

deciduous

Question 2

the Latin word “decidere” means?

Answer 2

to fall off

Question 3

common nicknames for deciduous/primary teeth?

Answer 3

baby teeth, milk teeth, temporary teeth

Question 4

the dentition that follows the primary teeth is called?

Answer 4

permanent dentition

Question 5

permanent dentition can also be called?

Answer 5

secondary dentition or adult dentition

Question 6

Are there primary premolars?

Answer 6

No

Question 7

primary molars are replaced by?

Answer 7

permanent premolars

Question 8

succedaneous

Answer 8

the 20 permanent teeth that replace or succeed their primary tooth predecessors

Question 9

Do the 12 permanent molars have predecessors in primary dentition?

Answer 9

No. They erupt distal to the primary molars.

Question 10

Are permanent molar succedaneous teeth?

Answer 10

No. Because they do NOT replace primary teeth, they erupt distal to the primary molars.

Question 11

How many primary teeth are there?

Answer 11

20

Question 12

primary teeth can be identified using the?

Answer 12

Universal Identification System by assigning letters A-T, starting with A on the maxillary right 2nd molar and ending on the mandibular right 2nd molar.

Question 13

What are some reasons that primary teeth are important?

Answer 13

1) mastication (aka chewing)
2) support for cheeks and lips, maintaining a normal facial and smile appearance
3) formulation of clear speech
4) critical for maintaining space required for eruption of permanent teeth

Question 14

Deep decay (infection of pulp) in the primary tooth can lead to disruption of _____ formation in the permanent tooth? This is called?

Answer 14

enamel

enamel hypoplasia

Question 15

turner hypoplasia

Answer 15

discolored spot in the permanent tooth due to disruption in enamel formation from infected primary teeth

Question 16

Eruption of primary teeth is considered normal if its within ____ months of typical eruption time

Answer 16

4 to 5 months early or late

Question 17

Eruption of permanent teeth is considered normal if its within ____ months of typical eruption time

Answer 17

12 to 18 month early or late

Question 18

mixed dentition

Answer 18

both primary and permanent dentition present

Question 19

edentulous

Answer 19

No teeth, lacking teeth

Question 20

Approximate age for no teeth (edentulous)?

Answer 20

birth to 6 months

Question 21

Approximate age for primary dentition only?

Answer 21

6 months to 2 1/2 years old= eruption of primary teeth

2 1/2 to 6 years old= all primary teeth present

Question 22

Approximate age for mixed dentition?

Answer 22

6 to 9 years= all eight permanent incisors are replacing primary
9-12 years= all four permanent canines and eight premolars are replacing primary

Question 23

exfoliation

Answer 23

shedding of baby teeth

Question 24

Approximate age for permanent dentition only?

Answer 24

after 12 years= all primary teeth exfoliated

Question 25

second molars are also called?

Answer 25

12 year molars

Question 26

Typically once the 12 year molars or second molars have erupted the mouth is _____ dentition?

Answer 26

permanent

Question 27

If present, 3rd molars typically erupt when?

Answer 27

17 to 21 years old

Question 28

Wisdom teeth are?

Answer 28

3rd molars

Question 29

permanent teeth begin forming in?

Answer 29

the jawbone

Question 30

The crowns of all 20 primary teeth begin to calcify when?

Answer 30

4 and 6 months in utero

Question 31

crown completion of all primary teeth occurs within?

Answer 31

the first year after birth, taking an average of 10 months from the beginning of tooth calcification

Question 32

when does root formation of primary (and permanent teeth) begin?

Answer 32

Once the enamel on the crown is formed, and at the same time, the tooth starts its occlusion movement through bone toward the oral cavity

Question 33

attrition

Answer 33

wear of tooth, process of gradually reducing strength or effectiveness

Question 34

What are the first primary teeth likely to erupt?

Answer 34

1) mandibular central incisors (about 6 to 10 months) 2) maxillary central incisors 3) maxillary lateral incisors 4) mandibular lateral incisors

Question 35

What are the last primary teeth to emerge?

Answer 35

maxillary second molars

Question 36

What teeth erupt after incisors?

Answer 36

primary 1st molars, then canines, then second molars

Question 37

after primary teeth erupt, there ____ are completed around 18 months to 3 years?

Answer 37

roots

Question 38

Are primary molars larger or smaller than the premolars that replace them?

Answer 38

larger. They are wider

Question 39

leeway space

Answer 39

The extra space given for premolars to erupt into bc the primary molars are larger

Question 40

primate space

Answer 40

the space between primary anterior teeth, occur mesial to the maxillary canines and distal to the mandibular canines

Question 41

primate space good or bad?

Answer 41

This space concerns parents but its good because it gives more space for permanent. Typically get larger as the mandible and maxillary grow larger

Question 42

Why do primary molar roots have a flare?

Answer 42

The space saved by the roots helps preserve space for premolars and secondary canines

Question 43

root resorption

Answer 43

gradual breakdown and loss of root structure

Question 44

primary roots begin to resorb?

Answer 44

about 3 years after completion, so primary teeth are only complete for a short while

Question 45

where does resorption start on a root?

Answer 45

at the apex or along the side of the root close to the apex

Question 46

mixed dentition starts around what age?

Answer 46

6. When the permanent molars emerge, then incisors

Question 47

mixed dentition usually ends around what age?

Answer 47

12

Question 48

permanent tooth crowns begin to form when?

Answer 48

at birth, with the permanent first molars

Question 49

When do permanent teeth crowns cease to form?

Answer 49

around 16 when the 3rd molar is completed

Question 50

crown formation of most crowns of permanent teeth take how long?

Answer 50

3 to 4 years

Question 51

crown completion occurs

Answer 51

about 3 to 4 years later, after crown formation and prier to tooth eruption

Question 52

How long does it take succedaneous teeth to erupt after the primary tooth is exfoliated?

Answer 52

about a year

Question 53

Age of eruption for permanent incisors and canines/premolars?

Answer 53

incisors (6 to 9) | canines/premolars (9-12)

Question 54

Order of eruption of permanent teeth?

Answer 54

``` 6 year molars mandibular central incisors maxillary central incisors (7-8) mandibular lateral incisors (7-8) maxillary lateral incisors mandibular canines (9) mandibular premolars Maxillary premolars maxillary canines (close to 12) ```

Question 55

What is the only mandibular permanent tooth likely to erupt AFTER its maxillary counterpart?

Answer 55

second premolar

Question 56

Last permanent tooth to emerge?

Answer 56

maxillary canines (unless they have 3rd molars present)

Question 57

roots of secondary teeth are likely to finish forming?

Answer 57

about 3 years after their emergence into the oral cavity