RESUMO
To determine the prevalence of periodontal disease and gindivitis and their relationships with probable influencine, University of Tehran,Iran.[1992-2000]. Case series. 300 dogs were Used in the Study. Animals with 6 months of age and older include in this study. Factors like: age, diet, content of bone in the diet [hardness of diet] and occlusion conformation were recorded in each animal. Based on oral examinations and factors like: dental calculus, depth of gingival sulcus, dental mobility and loosing teeth, the gingival status of the dogs were determined as: healthy, gingivitis [primary and irreversible lesions] and periodontitis [irreversible and advance cases]. Chi-square test and the frequencies in percent. The frequency rate of gingivitis and periodontitis in the study were 24% and 12% respectively. Age and occlusion conformation had not any significant influence on disease progression. Small breeds had a higher tendency for the dental problems [gingivitis=32.8% and perodontitis=24.8%] in comparison with larger breeds [gingivitis=19.2% and perodontitis=0.9%]. Periodontal disease was more common in older animals in a manner that none of the animals over 5 years old had healthy gingiva. Furthermore the dogs that had access to bone in their diets had lesser periodontal problems [jealthy gingiva=79.9%]. dental calculus deposits were more abundant and gingival sulcus was deeper in maxillary forth premolars and first molars teeth but mobility and loosing problems were more common in incisors. With respect to results of this study periodontal disease was common in dogs referred to small animal hospital, faculty of Veterinary Medicine University of Tehran. Therefore, especial attebtion should be paid to the oral hygiene situation and dog's especially small breeds and older animals should be fed with a diet sufficient of hard material