Abstract
For ethical reason, initiation and progression of periodontal disease as well as certain types of periodontal treatment cannot be studied in humans. Instead, numerous studies in this field have been carried out in laboratory animals. Animal models are needed to objectively evaluate the pathogenesis of human periodontal disease and its various treatment modalities. A number of animal models have been used in studying etiology and pathology of periodontitis. The primate model is recommended because the pathogenesis in primate model closely resembles that in humans. In addition, the dog model is used frequently because of ease of ligature placement as well as the natural occurrence of periodontal disease. However, ease of handling, inexpensive, short study time, low variation among strains and controlled microflora, relatively disease resistant, make the rat model extremely versatile and suited for a wide range of research endeavors. Rats are used mainly for research in toxicity, nutrition, behavior, and cancer. Normal oral structure and physiology and the pathogenesis of periodontal diseases have been studied more extensively in the rat than in any other rodents. Rats are used extensively to study the effects of drugs on the gingiva because their tissue overgrowth is similar to that of humans. The purpose of this review is to evaluate rats as models for studying various aspects of periodontal disease, including disease process and its treatment handling, advantages and limitations of these models.
Published Version
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