Anatomy of orofacial structures Exam 1

Second stage of enamel formation - answer-Maturation stage Function of Nasmyth's membrane - answer-Protection of newly erupted teeth Nasmyth's membrane - answer-Final function of ameloblasts; membrane covers crown of newly erupted teeth for several months What is a dentinal tubule? - answer-A long tube running from the DEJ or DCJ to the pulp; contains an odontoblastic process. Primary dentin - answer-Dentin that forms before eruption and that makes up the bulk of the tooth Secondary dentin - answer-Dentin that forms after eruption and continues at a very slow rate throughout the life of the tooth Reparative dentin - answer-Localized formation of dentin in response to local trauma, such as occlusal trauma or caries. Main pulp abnormality - answer-Pulp stones function of Hertwig's epithelial root sheath - answer-Begin root formation; determine the shape and number of roots Gingival fibers - answer-run from the cementum into the free and attached gingival area; support the gingiva Transseptal fibers - answer-from the cervical area of one tooth across to an adjacent tooth (on the mesial or distal only) to provide resistance to separation of teeth Alveolodental fibers - answer-run from cementum to alveolar bone. Supraeruption - answer-Eruption of a tooth beyond the occlusal plane. mesial drift - answer-Natural movement of teeth toward midline of the oral cavity. Can occur if tooth is lost Ankylosis - answer-Condition in which the alveolar crest of bone fuses in the cervical area with the cementum of a resorbing root Exfoliation - answer-eruption of primary teeth Reasons why primary teeth are retained - answer-No permanent success