tooth resorption

physiologic, pathologic

tooth resorption is either a — or — process that results in the loss of dentin, cementum and or adjacent bone

dentin, cementum, alveolar bone

main tissues involved in tooth resorption

shedding of primary teeth, bone remodeling

examples of physiologic tooth resorption

trauma, untreated caries, bacterial infection, tooth bleaching

examples of pathologic tooth resorption

natural antiresorptive barriers

teeth contains — a protective layers that normally prevent clastic cells from attaching to and resorbing mineralized dentin and cementum

clastic cells from attaching to and resorbing mineralized dentin and cementum

natural antiresorptive barriers prevent —

predentin, precementum

types of natural antiresorptive barriers

predentin

type of natural antiresorptive barriers

• unmineralized layer on the inner surface of dentin

precementum

type of natural antiresorptive barriers

• unmineralized layer covering the external root surface, over the cementum

inner surface of dentin

predentin is an unmineralized layer on the —

external root surface, over the cementum

precementum is an unmineralized layer covering the —

breakdown of natural barriers, continual stimulation, blood supply

the resorption triad

pdl, precementum, predentin

the resorption triad

• breakdown of natural barriers - something that damages the —

bacterial in the root canal, necrosis of the pdl, developmental defects, adjacent impacted tooth, adjacent cyst or tumor, orthodontic braces

the resorption triad

• continual stimulation - there needs to be a persistent stimulus that keeps the resorptive process going such as —

viable blood supply

the resorption triad

• blood supply - clastic cells are living cells so they need —

natural barriers are damaged

pathophysiology of tooth resorption

• step 1

there needs to be a persistent stimulus that keeps activating the resorptive process

pathophysiology of tooth resorption

• step 2

viable blood supply provides living cells needed for the process to survive

pathophysiology of tooth resorption

• step 3

activation of clastic cells

pathophysiology of tooth resorption

• step 4

odontoclasts

clastic cells

• resorbs dentin

cementoclasts

clastic cells

• resorbs cementum

osteoclasts

clastic cells

• resorbs bone

clastic cells attach to the exposed mineralized tissue

pathophysiology of tooth resorption

• step 5

breakdown of the mineralized tissue

pathophysiology of tooth resorption

• step 6

formation of a resorption lacuna

pathophysiology of tooth resorption

• step 7

injuries that may result from surgical, physical, chemical, thermal insult , mechanical stimulation, infection or neoplastic disease, prolonged use of orthodontic appliances, tooth grinding, tooth bleaching, physical injury to a tooth or pulpitis

etiology of tooth resorption

internal resorption

classification of tooth resorption

• process begins inside the tooth

external resorption

classification of tooth resorption

• begins from the external surface of the tooth

pulp or root canal wall

internal resorption involves the —

internal surface resorption, internal inflammatory resorption, internal replacement resorption

kinds of internal resorption

internal surface resorption

kinds of internal resorption

• mildest form

internal surface resorption

kinds of internal resorption

• resorption begins along the internal surface of the root canal or pulp space

internal surface of the root canal or pulp space

kinds of internal resorption

• internal surface resorption - begins along the —

internal inflammatory resorption

kinds of internal resorption

• involves inflammatory mediators

internal replacement resorption

kinds of internal resorption

• more severe

internal replacement resorption

kinds of internal resorption

• resorption progresses through the dentin

dentin

internal replacement resorption progresses through the —

external surface resorption, external inflammatory resorption, external replacement resorption, external invasive resorption, external pressure resorption, orthodontic resorption, physiologic resorption, idiopathic resorption

kinds of external resorption