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Occlusal trauma is a dental term that refers to the damage incurred when teeth are left in ''traumatic occlusion'' without proper treatment.〔Bibb, CA: Occlusal Evaluation and Therapy in the Management of Periodontal Disease. In Newman, MG; Takei, HH; Carranza, FA; editors: ''Carranza’s Clinical Periodontology'', 9th Edition. Philadelphia: W.B. Saunders Company, 2002. pages 698-701.〕 When the maxillary and mandibular dental arches approach each together, as they do, for example, during chewing or at rest, the relationship between the opposing teeth is referred to as occlusion. If this occlusal relationship is not balanced properly it may result in pain, tenderness and even mobility of the affected teeth.〔Bibb, CA: Occlusal Evaluation and Therapy in the Management of Periodontal Disease. In Newman, MG; Takei, HH; Carranza, FA; editors: ''Carranza’s Clinical Periodontology'', 9th Edition. Philadelphia: W.B. Saunders Company, 2002. page 701.〕 When the natural course of trauma, disease and dental treatment alters an individual's occlusion by removing or changing the occlusal (biting) surface of any of the teeth, that individual's teeth will come together, or ''occlude'', differently, and their occlusion will change.〔Hinrichs, JE: Occlusal The Role of Dental Calculus and Other Predisposing Factors. In Newman, MG; Takei, HH; Carranza, FA; editors: ''Carranza’s Clinical Periodontology'', 9th Edition. Philadelphia: W.B. Saunders Company, 2002. page 192.〕 When that change is detrimental to the manner in which the teeth occlude, the patient is said to possess a traumatic occlusion.〔(traumatogenic occlusion - definition of traumatogenic occlusion in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia )〕 Traumatic occlusion may cause a thickening of the cervical margin of the alveolar bone〔Carranza, FA: Bone Loss and Patterns of Bone Destructions. In Newman, MG; Takei, HH; Carranza, FA; editors: ''Carranza’s Clinical Periodontology'', 9th Edition. Philadelphia: W.B. Saunders Company, 2002. page 362.〕 and widening of the periodontal ligament, although the latter is not pathognomonic for this condition.〔Trauma from Occlusion Handout, Dr. Michael Deasy, Department of Periodontics, NJDS 2007. page 5〕 ==Histologic features associated with occlusal trauma== Microscopically, there will be a number of features that accompany occlusal trauma:〔Trauma from Occlusion Handout, Dr. Michael Deasy, Department of Periodontics, NJDS 2007. page 7〕 *Hemorrhage *Necrosis *Widening of the periodontal ligament, or PDL (also serves as a very common radiographic feature) *Bone resorption *Cementum loss and tears It was concluded that widening of the periodontal ligament was a "functional adaptation to changes in functional requirements".〔Wentz et al. J Perio, 1958〕 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「Occlusal trauma」の詳細全文を読む スポンサード リンク
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