Tooth Eruption

Question 1

what are the basic movements of a tooth

Answer 1

from developmental position in the jaw

to functional position in occlusion

Question 2

what are the rupture o=moveennts

Answer 2

continue adjusting tooth
over eruption response to opposing extraction
compensation for wear

Question 3

what is active eruption

Answer 3

bodily move of tooth

Question 4

what is passive ruption

Answer 4

uncovering of tooth by apical gingival migration

Question 5

what is the deciduous eruptive movement

Answer 5

bloodless eruption

pre eruptive movement

Question 6

what is the epermananet eruptive move

Answer 6

deciduous exfoliation

Question 7

what is the pre eruptive movement

Answer 7

during tooth dev
teeth move as jaw grows
successional teeth move from lingual/palatal position
bon remodelling

Question 8

where do the lower premolars start form

Answer 8

lingually and move between the roots of the deciduous molars

Question 9

what is eruption

Answer 9

into the mouth and ito occlusion

axial moveemtn

Question 10

what is the eruptive force

Answer 10

5-10g force

Question 11

what sit he speed like for eruption

Answer 11

variable
1mm month - upper 1
4.5mm 14 months - lower 5
1mm in 3 months - 8’s

Question 12

what is eruption a balance between

Answer 12

eruptive forces

resistive forces - overlying tissues

Question 13

what are the push and pull components of the theory of eruption

Answer 13

push

• root form
• pulp prolif
• bone form
• fluid pressure

pull

• collagen contracts
• fibroblast contrcation
• fibroblast migration

Question 14

when do roots form

Answer 14

during eruption

Question 15

when is root formation against eruption

Answer 15

eruption path > root length

impacted teeth

Question 16

how is bone formation for eruption

Answer 16

bone forms under erupting tooth

Question 17

how is bone formation against eruption

Answer 17

root recited teeth erupt

bone fills in as tooth moves away

Question 18

how is hydrostatic pressure for eruption

Answer 18

`pd vasculature
cervical sympathetic stimulation
sympathectomy

Question 19

what is cervical sympathetic stimulation

Answer 19

vasoconstriction
cessation of eruption
reversible on cessation

Question 20

what is sympathectomy

Answer 20

vasodilation - inc tissue pressure

increase eruption rate

Question 21

how is hydrostatic pressure against eruption

Answer 21

root resected rodent incisor erupt normally

Question 22

what is the role of PDL fibres in eruption

Answer 22

rot resected exp
disrupt collagen formation
- no vit c ( collagen syn)
- lathyrogens (prevent cross

Question 23

so the result in PDL fibres in eruption is

Answer 23

slower eruption
no change in eruption
root fomraiotn continues
pollen sun affects eruption rte

Question 24

how are collagen contractions for eruption

Answer 24

principle oblique fibres

collagen can contract in vivo

Question 25

how are collagen contractions against eruption

Answer 25

no proof that collagen contracts in vivo

Question 26

how ar fibroblast migration/contration forces transmitted

Answer 26

along principle oblique fibres - scar tissue contraction

Question 27

how are fibroblasts migrtaion/contrcation for eruption

Answer 27

fibroblasts show motility move cervically on eruption colchine - reduces cell motility - retard eruption

Question 28

how are fibroblasts migration/contraction against eruption

Answer 28

PDL fibroblasts don't have organelles for motility | no evidence can exert eruptive force

Question 29

what is the summary of eruption theories

Answer 29

multifactorial not due to - bone form or root form due to - pull - PDL fibroblasts - push - hydrostatic pressure

Question 30

what are the series of events in bloodless eruption

Answer 30

``` REE + oral mucosa collagen disintegrates + REE prolif fusion of oral epi and REE epi cell death epi pathway REE forms JE ```

Question 31

what is deciduous exfoliation

Answer 31

deciduous tooth resorbed = successional eruption | pressure on tooth - resorption

Question 32

what resorbs the deciduous teeth

Answer 32

resorbed by osteoclasts - multinucleate ostecast cells derived form monocytes

Question 33

what are som post eruptive movements

Answer 33

accommodate for growth compensate for occlusal wear accommodate approximal wear following extraction of opposing tooth