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periodontium root gingiva incisor tooth medical periodontal cartilaginous calcification cementum microscopic orthodontic stage anatomy science odontoclast tissue craniofacial crown education structure resorption odontogenesis endodontic dentin bone biology enamel ameloblast nerve molar canine premolar odontoblast oral health histology alveolar pulp dental maxilla mineralization gum maxillofacial osteology ai generated