tooth morphology - elcock :) Flashcards
what is the outer surface at the front of the mouth/adjacent to lips
labial
outer surface of posterior teeth
buccal
inner surface of teeth upper
palatal
where teeth meet
occlusal
inner surface of teeth lower
lingual
closer to the midlien
mesial
further from midline
distal
top surface of front teeth
incisal
shape of permanent incisors
chisel shape
mesial angle of incisors
90
distal shape of incisors
more rounded
how long can canines roots be
3x crown size
how many cusps are on the pre molars
2 cusps on occlusal surface
unqual size
which is the largest cusp on pre molars
buccal
exept upper 5 equal
how many roots do pre molars have
1
except for upper 4 (2)
what is the crown outline for upper premolars
oval
what is the crown outline for lower premolars
round
shape of lower permanent molars
retangular
shape of upper permanent molars
rhomboid/diamoind
how many roots do lower molars have
2
how many roots do upper molars have
3
primary vs permanent teeth
primary: smaller more bulbous larger pulp chamber whiter (less mineralsied 92%)
what is different about tooth D compared to permanent dentiton 4
mix of premolar and molar
not like any other tooth
what can be seen over time on primary teeth
attrition
wearing of teeth due to lower mineralisation
root resporption
primary molar roots are…
flared
primary dentition tooth D feature
large tubercle of Zuckerkandl
pulp morphology and dentine permanent vs primary
pulp is larger in primary
therefore dentine layer is thinner
tooth form when tooth breaches the mucosa
roots half formed
crown partially out
how long does it take to form a tooth
9 yrs
when the crown is formed what is it found within before eruption
crypt
how long does it take to form a primary tooth
30 months
what is the primary order of eruption
A B D C E
what does primary develpment time range from
23-44 months
when are roots complete in primary teeth
after eruption 18 months
when does crown formation complete after birth
3mn to 1 year after birth
when does crown calification start
3mnth to 6 mnth in utero
how does resorption of a tooth occur
roots resorb
cementum and dentine resorb
mobilty of the tooth increases
PDL breaks down
eruption phases
pre
pre functional
post
mechanisms of erution
root growth
bone deposition
pupal cell proliferation
periapical hydrostatic pressure
what erupt first upper or lower?
lower teeth first
eruption order and age
6 - 6yrs old 1 - 7yrs old 2 - 8yrs old 4 - 9yrs old 5 - 10yrs old 3 - 11yrs old 7 -12yrs old 8- 18yrs old
what is different about tooth 3
does not erupt until roots are almost fully formed
how long does it take for crown to form
3 yrs
how long does it take for roots to form
6 yrs
how to work out when crown frmation is complete
eruption age - 3 yrs
how to work out when crown calcification starts
eruption age - 6yrs
how to work out when roots are formed
eruption age + 3 yrs
eruption dates between females and males
females before males
what are teeth befroe birth called
natal teeth
eruption date ranges for teeth
6 mnths
how long are primary teeth in the mouth for
5-6yrs
what appears black in radiography
air/space
ie radiolucent
what block x rays
teeth
bone
fillings ect
