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