periodontology dentistry periodontium periodontitis periodontics perio pdl ai history nanoparticles nanotechnology chronic periodontitis clinical diagnosis gingivitis dental plaque epidemiological studies abscess endo miller's flap root coverage cells principal fibres fibres periodontal ligament cortisol hp axis coping stress atridox periochip metronidazole tetracycline doxycycline antimicrobial local drug delivery antibiotic periodontal therapy female aggressive periodontitis medicine nano progn hypersensitivity dentine motivation dr hiroj bagde periodontology trauma from tfo acute trauma from occlusion trauma from occlusion wound healing alveolar bone cementum development classification
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