Eruption and Shedding Flashcards

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1
Q

preeruptive movement

A
  • positioning tooth germs prior to eruption
  • primary move into postion- permanent shift apically
  • max molars first, occl surfaces buccal then shift down into place when there is room
  • mand molars lean lingually then swing into place when room
  • tooth germ either moves as a whole or directional growth
  • take place in bony crypt (associated with resorption or deposition)
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2
Q

eruptive movement

A

movement of tooth into functional occclusion
primary- fusion of oral epthelium with REE creating epithelium lined channel
permanent- gubernacular canal develops between alveolar bone and the tooth- forms along remnants of the dental lamina attached to lamina propria

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3
Q

posteruptive movement

A

compensation fro growth of jaws/wear
meant to keep tooth in occlusion
generally bone remodling

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4
Q

shedding

A

programmed loss of primary teeth

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5
Q

avulsion

A

non physiologic tooth movement

get tooth punched out

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6
Q

development of permanent/ deciduous teeth

A

incisors, canines, premolars have primary counterparts
start in same crypt but eventually develop their own crypt
dental lamina extends backwards to give rise to permanent 1, 2, 3 molars

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7
Q

Bone remodeling theory

A

Bone deposits under an erupting tooth propelling it outwards
Problems: remove dental follicle= no bone remodling and no erupiton
replica teeth placed in intact follicle still form eruption pathway

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8
Q

root growth theory

A

root formation pushed tooth outwards

problems: pushing against what, not enough root to account for movement, if you cut off root it still grows

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9
Q

vascular pressure theory

A

blood vessels at apex push it outwards
problem: no way is pressure sufficient
remove vascular supply and tooth still erupts

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10
Q

cushion hammock theory

A

magical ligament pushed tooth out

there is no ligament

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11
Q

current erruptive tooth movement theory

A

PDL fibroblasts pull against each other and collagen bundles
but it is possible for rootless teeth or PDL less teeth to erupt
ental follicle is critical- initates bone resoption and breakdown of soft tissues
REE may signal when tooth is ready

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12
Q

orthodontic movement

A

gently constant forces, cementum is harder than bone
tension- pdl fibers remodeled and deposition
compression- pdl fibers remodled and resoption
hyalinization- damage to PDL
tweak too hard you hurt pulp and vascular supply

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13
Q

wear

A

compensation for interproximal wear= mesial drift. generally inclined emsially
bone/PDL remodeling keep them in new orientation

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14
Q

shedding

A

incisors/canines: preceded by resorption of deciduous roots on lingual surfaces
primary molars- interradicular dentin and bone resorption
as components of the permanent tooth are driving resorption, contact points are where it generally occurs

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15
Q

resoprtion of dental tissues

A

hard tisues (dentin and cementum) resorbed by odontoclasts
pdl and soft tissue resorbed by cells/enzymes
pressure from advancing permanent tooth can speed process
even without a permanenet tooth the primary tooth eventually will shed due to increase mastication forces

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16
Q

simulation of shedding

A

combination of pressure from erupting teeth leading to decreased mechanical stability which leads to further resoprtion

17
Q

sequence of shedding/ eruption

A

generally symmetrical
mandibular teeth shed prior to maxillary occlusal buddies except primary 2nd molars (typically all 4 at once)
mandible- anterior to posterior
maxilla- same but 1st molars before the canines