Changes

Radiography will identify lesions that are localized to the root surfaces within the alveolar bone, which would not be detected by clinical methods. Radiography is also required to confirm the diagnosis and to assess the extent and  type of the lesion. Radiographs often reveal a lesion that is more advanced than originally suspected from the clinical examination. <font color="red">PicTR7</font color>

Radiography will identify lesions that are localized to the root surfaces within the alveolar bone, which would not be detected by clinical methods. Radiography is also required to confirm the diagnosis and to assess the extent and  type of the lesion. Radiographs often reveal a lesion that is more advanced than originally suspected from the clinical examination. <font color="red">PicTR7</font color>

Radiographic features of RLs:  

[[Tooth Resorption - Radiographic Interpretation|Radiographic features of RLs]]: <br>

a) loss of integrity of the periodontal ligament space  

a) loss of integrity of the periodontal ligament space <br>

b) loss of the lamina dura

b) loss of the lamina dura<br>

c) irregularities on the root surface

c) irregularities on the root surface<br>

d) diffuse decrease in radiodensity of the entire root compared with adjacent roots  

d) diffuse decrease in radiodensity of the entire root compared with adjacent roots<br>

e) radiolucent areas within the root dentine often extending into the crown dentine  

e) radiolucent areas within the root dentine often extending into the crown dentine<br>

f) replacement of root substance by bone-like tissue.  

f) replacement of root substance by bone-like tissue. <br>

g) resorbing roots present with clinically missing crown  

g) resorbing roots present with clinically missing crown <br>

 

 

 

 

Classification of tooth resorption : <font color="red">(American Veterinary Dental College classification) pictures</font color>

Radiographic signs of FORLs include erosion of alveolar bone at the cementoenamel junction, root resorption, root ankylosis and subsequent periodontal space loss and resorption of the dental crown.

<center>

<center>

{| style="width:50%; height:200px" border="1"

{| style="width:80%; cellspacing="2" border="1"

! '''Disease type'''

! '''Disease type'''

|-

|-

|'''Stage 1'''

|'''Stage 1 (TR 1)'''

|[[Enamel Organ#Enamel|Enamel]] only

|Mild dental hard tissue loss ([[cementum]] or cementum and [[enamel]]).

|Enamel and dentine

|-

|-

|'''Stage 3'''

|'''Stage 2 (TR 2)'''

|Pulp exposure

|Moderate dental hard tissue loss (cementum or cementum and enamel with loss of dentin that does not extend to the pulp cavity).

|-

|-

|'''Stage 4'''

|'''Stage 3 (TR 3)'''

|Extensive structural damage

|Deep dental hard tissue loss (cementum or cementum and enamel with loss of dentin that extends to the pulp cavity); most of the tooth retains its integrity.

|-

|-

|'''Stage 5a'''

|'''Stage 4 (TR 4)'''

|[[Enamel Organ#Crown|Crown]] is resorbed but the roots are retained.  

|Extensive dental hard tissue loss (cementum or cementum and enamel with loss of dentin that extends to the pulp cavity); most of the tooth has lost its integrity. <br>

'''TR4a''' Crown and root are equally affected; Extensive dental hard tissue loss (cementum or cementum and enamel with loss of dentin that extends to the pulp cavity); most of the tooth has lost its integrity.<br>

'''TR4b''' Crown is more severely affected than the root; Extensive dental hard tissue loss (cementum or cementum and enamel with loss of dentin that extends to the pulp cavity); most of the tooth has lost its integrity.<br>

'''TR4c''' Root is more severely affected than the crown.

|-

|-

|'''Stage 5b'''

|'''Stage 5 (TR 5)'''

|Crown is intact but the root is resorbed

|Remnants of dental hard tissue are visible only as irregular radiopacities, and gingival covering is complete.

|}

|}

</center>

</center>

==Pathology==

==Pathology==

Odontoclasts attack external and internal to the [[:Category:Teeth - Anatomy & Physiology|tooth]]. Initially they start at the neck/cervical region and extend into [[Enamel Organ#Root|tooth root]] they also enter the root via the apical foramen (stage 3 lesions).

Odontoclasts attack external and internal to the [[:Category:Teeth - Anatomy & Physiology|tooth]]. Initially they start at the neck/cervical region and extend into [[Enamel Organ#Root|tooth root]] they also enter the root via the apical foramen (stage 3 lesions).