Tooth Eruption Flashcards
what are the basic movements of a tooth
from developmental position in the jaw
to functional position in occlusion
what are the rupture o=moveennts
continue adjusting tooth
over eruption response to opposing extraction
compensation for wear
what is active eruption
bodily move of tooth
what is passive ruption
uncovering of tooth by apical gingival migration
what is the deciduous eruptive movement
bloodless eruption
pre eruptive movement
what is the epermananet eruptive move
deciduous exfoliation
what is the pre eruptive movement
during tooth dev
teeth move as jaw grows
successional teeth move from lingual/palatal position
bon remodelling
where do the lower premolars start form
lingually and move between the roots of the deciduous molars
what is eruption
into the mouth and ito occlusion
axial moveemtn
what is the eruptive force
5-10g force
what sit he speed like for eruption
variable
1mm month - upper 1
4.5mm 14 months - lower 5
1mm in 3 months - 8’s
what is eruption a balance between
eruptive forces
resistive forces - overlying tissues
what are the push and pull components of the theory of eruption
push
- root form
- pulp prolif
- bone form
- fluid pressure
pull
- collagen contracts
- fibroblast contrcation
- fibroblast migration
when do roots form
during eruption
when is root formation against eruption
eruption path > root length
impacted teeth
how is bone formation for eruption
bone forms under erupting tooth
how is bone formation against eruption
root recited teeth erupt
bone fills in as tooth moves away
how is hydrostatic pressure for eruption
`pd vasculature
cervical sympathetic stimulation
sympathectomy
what is cervical sympathetic stimulation
vasoconstriction
cessation of eruption
reversible on cessation
what is sympathectomy
vasodilation - inc tissue pressure
increase eruption rate
how is hydrostatic pressure against eruption
root resected rodent incisor erupt normally
what is the role of PDL fibres in eruption
rot resected exp
disrupt collagen formation
- no vit c ( collagen syn)
- lathyrogens (prevent cross
so the result in PDL fibres in eruption is
slower eruption
no change in eruption
root fomraiotn continues
pollen sun affects eruption rte
how are collagen contractions for eruption
principle oblique fibres
collagen can contract in vivo
how are collagen contractions against eruption
no proof that collagen contracts in vivo
how ar fibroblast migration/contration forces transmitted
along principle oblique fibres - scar tissue contraction
how are fibroblasts migrtaion/contrcation for eruption
fibroblasts show motility
move cervically on eruption
colchine - reduces cell motility - retard eruption
how are fibroblasts migration/contraction against eruption
PDL fibroblasts don’t have organelles for motility
no evidence can exert eruptive force
what is the summary of eruption theories
multifactorial
not due to
- bone form or root form
due to
- pull - PDL fibroblasts
- push - hydrostatic pressure
what are the series of events in bloodless eruption
REE + oral mucosa collagen disintegrates + REE prolif fusion of oral epi and REE epi cell death epi pathway REE forms JE
what is deciduous exfoliation
deciduous tooth resorbed = successional eruption
pressure on tooth - resorption
what resorbs the deciduous teeth
resorbed by osteoclasts
- multinucleate ostecast cells
derived form monocytes
what are som post eruptive movements
accommodate for growth
compensate for occlusal wear
accommodate approximal wear
following extraction of opposing tooth
