primary and mixed dentition Flashcards
name some functions of primary teeth
chewing, support for lips and cheeks, maintain arch space room for secondary dentition
what happens if primary teeth fall out too early?
cause guidance problems for the secondary teeth
what are turners spots?
when a primary tooth has decay and passes it onto the incoming tooth
no teeth stage ( edentulous)
birth to 6 or 8 months
primary dentition only stage
they erupt from 6 months to 2 years, all 20 are present until about 6 years of age
mixed dentition stage
6-12 years
adult dentition only stage
after 12. ( last tooth erupts around late teens/early 20’s)
why are secondary teeth more yellow?
higher level of dentin
what pushes teeth out?
the root formation
primary crowns begin to form when?
6 months in utero
crowns are complete when?
about 10 months after beginning
roots are complete when?
1.5-3 years after emergence
exfoliation of primary teeth occurs when?
6-12 years
secondary crowns begin to form/calcify when?
beginning at birth for first 2 molars, 3rd molar is 8-10 years
how long are the crowns complete before erupting?
about 3 years
after eruption how long is it until roots are complete?
about 3 years
order of emergence of primary teeth
first- mandibular central incisor second- other incisors ( maxillary laterals are last) third- first molars fourth- canines fifth- second molars
order of emergence of secondary teeth
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
name some traits of all primary teeth
cervical crown bulges, long root compared to crown, more wear( less mineralized)
dentition traits of anterior primary teeth compared to secondary
no labial depressions or perikymata, roots bend labially in apical 1/3
dentition traits of primary molars
prominent mesial cervical ridges ( bulge)
primary molar traits continued
second molars are larger than first, enamel rods slope occlusally,
primary molar roots
furcations are near crown ( small root trunks) this allows incoming teeth to move up
primary incisor crowns
longer incisocervically than mesiodistally ( except maxillary central)
incisor lingual view
large cingulum
incisors proximal view
all roots bend facially in apical 1/3 of root, maxillary incisor root also bend lingually in cervical half
incisors incisal view
maxillary central is much wider mesiodistally than faciolingually. Others are about equal.
primary canine labial view
maxillary- about as wide and long
mandibular- like secondary; longer incisocervically than mesiodistally
primary maxillary canine lablial view
longer mesial marginal ridge making its contact more cervical ( just like an adult maxillary PM)
primary mandibular canine labial view
longer distal marginal ridge than mesial. Not as pointy as maxillary
primary canine lingual view
maxillary have more prominent ridges and cingulum
primary canine proximal view
cervical third very thick. Has pronounced lingual and cervical bulges
canine cusp tips
maxillary is more labial, mandibular is more lingual
primary molar root traits
maxillary have 3, mandibular have 2
primary molar length vs its replacement
wider mesiodistally than the premolars that replace them
where is the prominent bulge on all primary molars?
mesiobuccal
where do the cervical lines curve in primary molars?
apiccaly in mesial half of buccal surface
primary second molars resemble what?
secondary first molars “mini me”
primary first molar
“wanna be” , maxillary looks like premolar, mandibular looks like nothing
primary maxillary first molar
crown is wider faciolingually than mesiodistally, occlusal groove is “H” form
primary mandibular first molar
4 cusps, wider mesiodistally, prominent mesiobuccal cervical ridge, prominent mesial transverse ridge, occlulsal table wider buccolingually in distal half.
pulp cavities of primary teeth
larger in proportion to the tooth. Molar chambers are mostly in the crown
