| Feline Odontoclastic Resorptive Lesion |
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Feline odontoclastic resorptive lesions (FORLs) is a disease in and Persian s, may be more susceptible.3 FORLs appear as erosions of the surface of the tooth at the Gingiva l border. They are often covered with Calculus or gingival tissue. It is a progressive disease, usually starting with loss of Cementum and Dentin and leading to penetration of the Pulp cavity. Resorption continues up the Dentinal Tubules into the tooth crown. The Enamel is also resorbed or undermined to the point of tooth fracture. Resorbed cementum and dentin is replaced with bone-like tissue. SYMPTOMS Symptoms of FORLs include mouth pain (caused by dentin exposure), especially while chewing, anorexia, dehydration, weight loss, and tooth fracture. The lower third Premolar is the most commonly affected tooth. CAUSE The definitive cause of FORLs is unknown, but Histologically destruction of the cementum and other mineralized tissue of the tooth root by odontoclasts is seen. It occurs secondary to the loss of the protective covering of the root (the Periodontal Ligament s) and possibly to a stimulus such as Periodontal Disease and the release of Cytokine s, leading to odontoclast migration.4 However, FORLs can develop in the absence of inflammation. The natural inhibition to root resorption provided by the lining of the root may be altered by increased amounts of Vitamin D , in cats supplied by their diet. TREATMENT Treatment for FORLs is limited to Tooth Extraction to create a mouth free of pain. Amputation of the tooth crown without root removal has also been advocated in cases free of periodontal disease due to the fact that the roots often completely resorb.5 However, X-ray s are recommended prior to this treatment to document root resorption and lack of the periodontal ligament.6 Tooth Restoration is not recommended because resorption of the tooth will continue underneath the restoration. Use of Alendronate has been studied to prevent FORLs and decrease progression of existing lesions. DIFFERENTIAL DIAGNOSIS: DENTAL CARIES True Dental Caries are uncommon among companion animals.7 Although rarely seen in cats, the incidence of caries in dogs has been estimated at approximately 5%.Hale FA. "Dental caries in the dog." ''J Vet Dent.'' 1998 Jun;15(2):79-83. PMID 10597155. The term ''feline cavities'' is commonly used to refer to FORLs, however, sacchrolytic acid-producing bacteria are not involved in this condition. REFERENCES EXTERNAL LINKS
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