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Dental attrition is a type of tooth wear caused by tooth-to-tooth contact,〔Darby, M., Walsh, Margaret, & EBL ebook Library. (2009). Dental Hygiene Theory and Practice. (3rd ed.). London: Elsevier Health Sciences.〕 resulting in loss of tooth tissue, usually starting at the incisal or occlusal surfaces. Tooth wear is a physiological process and is commonly seen as a normal part of aging. Advanced and excessive wear and tooth surface loss can be defined as pathological in nature, requiring intervention by a dental practitioner. The pathological wear of the tooth surface can be caused by bruxism, which is clenching and grinding of the teeth. If the attrition is severe, the enamel can be completely worn away leaving underlying dentin exposed, resulting in an increased risk of dental caries and dentin hypersensitivity. It is best to identify pathological attrition at an early stage to prevent unnecessary loss of tooth structure as enamel does not regenerate. ==Signs and symptoms== Attrition occurs as a result of opposing tooth surfaces contacting. The contact can affect cuspal, incisal and proximal surface areas.〔Davies, SJ; Gray, RJM (2002). "Management of tooth surface loss". British Dental Journal 192 (1): 11-12〕 Indications of attrition can include:〔Wazani BE, BE; Dodd, MN; Milosevic, A (2012). "The signs and symptoms of tooth wear in a referred group of patients". British Dental Journal 213 (6): 17-27〕 * Loss of tooth anatomy: This results in loss of tooth characteristics including rounding or sharpening of incisal edges, loss of cusps and fracturing of teeth. Enamel of molar teeth may appear thin and flat. When in occlusion the teeth may appear the same height which is particularly apparent for anterior teeth. * Sensitivity or pain: Attrition may be entirely asymptomatic, or there may be dentin hypersensitivity secondary to loss of the enamel layer, or tenderness of the periodontal ligament caused by occlusal trauma. * Tooth discolouration: A yellow appearance of the tooth surface may be due to the enamel being worn away, exposing the darker yellower dentin layer underneath. * Altered occlusion due to decreasing vertical height, or occlusal vertical dimension. * Compromised periodontal support can result in tooth mobility and drifting of teeth * Loss in posterior occlusal stability * Mechanical failure of restorations 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「Attrition (dental)」の詳細全文を読む スポンサード リンク
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