primary and mixed dentition

Question 1

name some functions of primary teeth

Answer 1

chewing, support for lips and cheeks, maintain arch space room for secondary dentition

Question 2

what happens if primary teeth fall out too early?

Answer 2

cause guidance problems for the secondary teeth

Question 3

what are turners spots?

Answer 3

when a primary tooth has decay and passes it onto the incoming tooth

Question 4

no teeth stage ( edentulous)

Answer 4

birth to 6 or 8 months

Question 5

primary dentition only stage

Answer 5

they erupt from 6 months to 2 years, all 20 are present until about 6 years of age

Question 6

mixed dentition stage

Answer 6

6-12 years

Question 7

adult dentition only stage

Answer 7

after 12. ( last tooth erupts around late teens/early 20’s)

Question 8

why are secondary teeth more yellow?

Answer 8

higher level of dentin

Question 9

what pushes teeth out?

Answer 9

the root formation

Question 10

primary crowns begin to form when?

Answer 10

6 months in utero

Question 11

crowns are complete when?

Answer 11

about 10 months after beginning

Question 12

roots are complete when?

Answer 12

1.5-3 years after emergence

Question 13

exfoliation of primary teeth occurs when?

Answer 13

6-12 years

Question 14

secondary crowns begin to form/calcify when?

Answer 14

beginning at birth for first 2 molars, 3rd molar is 8-10 years

Question 15

how long are the crowns complete before erupting?

Answer 15

about 3 years

Question 16

after eruption how long is it until roots are complete?

Answer 16

about 3 years

Question 17

order of emergence of primary teeth

Answer 17

first- mandibular central incisor
second- other incisors ( maxillary laterals are last)
third- first molars
fourth- canines
fifth- second molars

Question 18

order of emergence of secondary teeth

Answer 18

1st- first molars followed by mandibular central incisors ( about 6 years)
2nd-other incisors
3rd- mandibular canines
4th- premolars
5th- maxillary canines
6th- second molars
7th-third molars

Question 19

name some traits of all primary teeth

Answer 19

cervical crown bulges, long root compared to crown, more wear( less mineralized)

Question 20

dentition traits of anterior primary teeth compared to secondary

Answer 20

no labial depressions or perikymata, roots bend labially in apical 1/3

Question 21

dentition traits of primary molars

Answer 21

prominent mesial cervical ridges ( bulge)

Question 22

primary molar traits continued

Answer 22

second molars are larger than first, enamel rods slope occlusally,

Question 23

primary molar roots

Answer 23

furcations are near crown ( small root trunks) this allows incoming teeth to move up

Question 24

primary incisor crowns

Answer 24

longer incisocervically than mesiodistally ( except maxillary central)

Question 25

incisor lingual view

Answer 25

large cingulum

Question 26

incisors proximal view

Answer 26

all roots bend facially in apical 1/3 of root, maxillary incisor root also bend lingually in cervical half

Question 27

incisors incisal view

Answer 27

maxillary central is much wider mesiodistally than faciolingually. Others are about equal.

Question 28

primary canine labial view

Answer 28

maxillary- about as wide and long | mandibular- like secondary; longer incisocervically than mesiodistally

Question 29

primary maxillary canine lablial view

Answer 29

longer mesial marginal ridge making its contact more cervical ( just like an adult maxillary PM)

Question 30

primary mandibular canine labial view

Answer 30

longer distal marginal ridge than mesial. Not as pointy as maxillary

Question 31

primary canine lingual view

Answer 31

maxillary have more prominent ridges and cingulum

Question 32

primary canine proximal view

Answer 32

cervical third very thick. Has pronounced lingual and cervical bulges

Question 33

canine cusp tips

Answer 33

maxillary is more labial, mandibular is more lingual

Question 34

primary molar root traits

Answer 34

maxillary have 3, mandibular have 2

Question 35

primary molar length vs its replacement

Answer 35

wider mesiodistally than the premolars that replace them

Question 36

where is the prominent bulge on all primary molars?

Answer 36

mesiobuccal

Question 37

where do the cervical lines curve in primary molars?

Answer 37

apiccaly in mesial half of buccal surface

Question 38

primary second molars resemble what?

Answer 38

secondary first molars "mini me"

Question 39

primary first molar

Answer 39

"wanna be" , maxillary looks like premolar, mandibular looks like nothing

Question 40

primary maxillary first molar

Answer 40

crown is wider faciolingually than mesiodistally, occlusal groove is "H" form

Question 41

primary mandibular first molar

Answer 41

4 cusps, wider mesiodistally, prominent mesiobuccal cervical ridge, prominent mesial transverse ridge, occlulsal table wider buccolingually in distal half.

Question 42

pulp cavities of primary teeth

Answer 42

larger in proportion to the tooth. Molar chambers are mostly in the crown