Periodontitis is an inflammatory process affecting the periodontal tissues caused by multi-factorial origin. Among all the characteristic signs of periodontal disease, loss of support from alveolar boneis the one which usually represents theanatomical sequela to the progression of periodontitis apically. The bone loss which is induced by periodontitis occur either single or in different combination forms. The identification of these osseous defects on surgical exposure of bone is clinically challenging as the osseous and it becomes imperative for a clinician to understand these defects and categorize them well to have better therapeutic approaches. Intimate knowledge of all these periodontal osseous defects associated with periodontal disease is essential. So this review is aimed at classification and deep insight which will be helpful for proper diagnosis and treatment of periodontal osseous defects.
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