Differential diagnosis of resorptive dental lesions (FORL) and caries [in cats]
1996
Berger, M. (Universitaet Bern, Bern (Switzerland). Klinik fuer kleine Haustiere, Abteilung Chirurgie und Orthopaedie) | Schawalder, P. | Stich, H. | Lussi, A.
Feline Odontoclastic Resorptive Lesions (FORL, previously known as "neck lesions") on cat teeth are compared with caries and differentiated by means of new methods. Radiological examination reveals typical odontoclastic resorptive processes, which occur at the dental root and the paradontium. These lesions demonstrate the destruction on the desmodont and the following ancylosing reaction. The rhodamine B stain, which is selective for caries, stains regions which are softened by caries in a dark red. Fuchsin/Acetic-Light Green stained histological preparations demonstrate the resorptive lacunae, resorptive lagoons, and resorptive canals. Giant cells with multiple nuclei and reparative cementum can also be shown with the same stain. Hardness measurements using a Knoop diamond (KHN, Knoop hardness number) give information about the degree of hardness of the different tissues. Electron microscopic investigations show the dentinal tubules and allow FORL and caries to be differentiated. Since FORL has also been found in wild cats, we concluded that nutrition has no effect on the pathogenesis of the disease
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