ANP 1107 Lecture Notes - Lecture 2: Muscular Layer, Stratified Squamous Epithelium, Periodontal Fiber

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1107
• Professor: Jackie Carnegie

Document Summary

Crown: above gingiva, covered by enamel (ca++ salts; hardest substance in body); but enamel-producing cells degenerate when tooth erupts; consequently, decayed or cracked areas of enamel will not heal and must be artificially filled. Root: embedded in jawbone; 1 root for i, c & pm (except 1st upper pms - usually have. 2), 2-3 roots for molars: outer surface of root covered by calcified connective tissue (cement) - attaches tooth to periodontal ligament, gingiva adhere to enamel; with age, recede to sensitive cement. Cell bodies of odontoblasts line the pulp cavity (which contains connective tissue, blood vessels, nerve fibers). The pulp cavity extends into root, leading to the root canal. Enamel, dentin, cement are all calcified & resemble bone, but are avascular. Cement & dentin (but not enamel) also contain collagen. Dental caries/cavities: result from bacterial action that gradually demineralizes enamel and underlying dentin.