The relationship of the pulp and the periodontium is dynamic. The tooth, its pulp and the supporting structures must be viewed as a single biological unit. The pulpal and periodontal tissues have a close relationship, both anatomically and functionally, the interrelationships among these structures influence each other during health, function and disease, because the vitality of the tooth depends on its ability to function and not on the viability of the pulp. The attachment apparatus which includes the cementum, the periodontal ligament and alveolar bone is the working area of both periodontics and endodontics with the disease being treated in the marginal region in the former, while at the apex in the later. Dental plaque is the primary initiating factor for both dental caries and periodontal diseases. Inflammation from pulp may extend into the periodontium causing destruction of periodontal tissues. Such a periodontal lesion is termed as "retrograde periodontitis”, because...

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