Tissue changes in the interradicular periodontium of multirooted teeth as correlated with age were studied in 58 male rats. Cementum thickness in the interradicular region increased considerably, as did the periodontal membrane, with advance in age. Alveolar process height decreased. This study supported the observation that tissue changes at the interradicular region occur throughout life, and are the result of "microtraumatism" because of occlusal stress.
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