Changes

===Types===

===Types===

Radiographs of teeth affected with TRs show distinct changes. The [[Enamel Organ#Root|roots]] of some affected teeth seem to “disappear” as they lose radiodense root tissue at a similar rate to the simultaneously occurring osseous repair, effectively making the roots appear to blend with the surrounding bone. The [[Enamel Organ|Periodontal Ligament|periodontal ligament]] and structural details are lost. Other TRs retain areas of normal radiodensity interspersed with radiolucencies caused by resorption and do not lose the detail of the periodontal ligament space and root structures in those areas not directly undergoing resorption. Areas of root resorption are often patchy, remaining radiolucent because the lost root substance is not replaced by reparative tissue. This type of TR also commonly demonstrates concurrent [[Periodontal Disease|periodontal]] or [[Endodontic Conditions|endodontic disease]].

Radiographs of teeth affected with TRs show distinct changes. The [[Enamel Organ#Root|roots]] of some affected teeth seem to “disappear” as they lose radiodense root tissue at a similar rate to the simultaneously occurring osseous repair, effectively making the roots appear to blend with the surrounding bone. The [[Tooth - Anatomy & Physiology|Periodontal Ligament|periodontal ligament]] and structural details are lost. Other TRs retain areas of normal radiodensity interspersed with radiolucencies caused by resorption and do not lose the detail of the periodontal ligament space and root structures in those areas not directly undergoing resorption. Areas of root resorption are often patchy, remaining radiolucent because the lost root substance is not replaced by reparative tissue. This type of TR also commonly demonstrates concurrent [[Periodontal Disease|periodontal]] or [[Endodontic Conditions|endodontic disease]].

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Lesions in which the roots are not replaced by bone-dense tissue are termed type 1 lesions while those in which the roots are replaced and appear to disappear are type 2 lesions. Both types of lesion can be found in the same individual cat, and even in the same tooth with one root appearing to be type 1 and the other root appearing to be a type 2. It is unknown if this is a stage of severity in which the root or region with the appearance of a type 1 lesion might eventually progress to become a type 2 lesion.<br><br>

Lesions in which the roots are not replaced by bone-dense tissue are termed type 1 lesions while those in which the roots are replaced and appear to disappear are type 2 lesions. Both types of lesion can be found in the same individual cat, and even in the same tooth with one root appearing to be type 1 and the other root appearing to be a type 2. It is unknown if this is a stage of severity in which the root or region with the appearance of a type 1 lesion might eventually progress to become a type 2 lesion.<br><br>