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Abstract
Detailed examinations were made of the central permanent incisors and periodontia of 30 or 40 ewes on each of one control farm and three periodontal disease (P.D.) farms. The study confirmed that incisor crown lengthening, protrusion and loosening were significant features of P.D. Periodontitis (assessed by increased sulcus depth and bleeding after probing) about the lingual sulcus was a significant feature of P.D. Labial gingivitis and labial periodontitis were not significant features. A relatively long lower jaw did not appear to be a feature of P.D.