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Periodontium refer to the specialized tissues that both surround and support the teeth, maintaining them in the maxillary and mandibular bones. The word comes from the Greek terms ''peri''-, meaning "around" and -''odons'', meaning "tooth." Literally taken, it means that which is "around the tooth". Periodontics is the dental specialty that relates specifically to the care and maintenance of these tissues. It provides the support necessary to maintain teeth in function. It consists of four principal components namely:〔http://books.google.co.in/books/about/Orban_s_Oral_Histology_and_Embryology.html?id=weo4yihNCQkC〕 * Gingiva * Periodontal ligament (PDL) * Cementum * Alveolar bone Each of these components is distinct in its location, tissue architecture, biochemical and chemical composition. They have their own distinct functions that are capable of adaptation during the life of the structure. For example as teeth respond to forces or migrate mesially, bone resorbs on the pressure side and is added on the tension side. Cementum similarly adapts to wear on the occlusal surfaces of the teeth by apical deposition. The periodontal ligament in itself is an area of high turnover that allows the tooth not only to be suspended in the alveolar bone but also to respond to the forces. Thus, although seemingly static and having functions of their own, all of these components function as a single unit.〔http://books.google.co.in/books/about/Carranza_s_Clinical_Periodontology.html?id=BspTzxVK6-kC〕 ==External forces and the periodontium== The periodontium exists for the purpose of supporting teeth during their function and it depends on the stimulation it receives from the function for preservation of its structure. Therefore a constant state of balance always exists between the periodontal structures and the external forces. Alveolar bone undergoes constant physiologic remodeling in response to external forces particularly occlusal forces. Bone is removed from areas where it is no longer needed and added to areas where it is needed. The socket wall reflects the responsiveness to the external forces. Osteoblasts and newly formed osteoid line the areas of tension whereas line of compression are lined by osteoclasts. The forces also influence the number density and alignment of trabeculae inside the bone. The bony trabeculae are aligned in the path of tensile and compressive stresses to provide maximum resistance to occlusal forces with a minimum of bone substance. When forces are increased the bony trabeculae also increase in number and thickness and bone is added to the external surfaces. The periodontal ligament depends on stimulation provided by function to preserve its structure. Within physiologic limits the PDL can accommodate increased function with increase in its width. Forces that exceed the adaptive capacity of the periodontium produce injury called ''trauma from occlusion''. When occlusal forces are reduced the PDL atrophies, appearing thinned. This phenomenon is called ''disuse atrophy''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Periodontium」の詳細全文を読む スポンサード リンク
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