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