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tooth wear
Tooth wear (also termed non-carious tooth substance loss) refers to loss of tooth substance by means other than dental caries or dental trauma.〔Kaidonis, J. A. "Oral diagnosis and treatment planning: part 4. Non-carious tooth surface loss and assessment of risk". British Dental Journal 2012; 213:155-161.〕 Tooth wear is a very common condition that occurs in approximately 97% of the population.〔Suchetha.A. “Tooth Wear - A Literature Review”. Indian Journal of Dental Science 2014; 5(6): 116 – 120.〕 This is a normal physiological process occurring throughout life, but accelerated tooth wear can become a problem.〔Bhushan, J; Joshi, R. "Tooth Wear - An Overview With Special Emphasis On Dental Erosion". Indian Journal of Dental Sciences 2011; 5(3): 89.〕
Tooth wear is majorly the result of three processes; attrition, Abrasion and Erosion.〔 These forms of tooth wear can further lead to a condition known as Abfraction,〔 where by tooth tissue is 'fractured' due to stress lesions caused by extrinsic forces on the enamel. Tooth wear is a complex, multi-factorial problem and there is difficulty identifying a single causative factor.〔 However, tooth wear is often a combination of the above mechanisms. E.g. attrition in bruxism sometimes occurs together with erosion. Many clinicians therefore make diagnoses such as "tooth wear with a major element of attrition", or "tooth wear with a major element of erosion" to reflect this. This makes the diagnosis and management difficult.〔 Therefore, it is important to distinguish between these various types of tooth wear, provide an insight into diagnosis, risk factors, and causative factors, in order to implement appropriate interventions.〔
==Attrition==
Attrition is loss of tooth substance caused by physical tooth-to-tooth contact.〔 The word attrition is derived from the Latin verb ''attritium'', which refers to the action of rubbing against something.〔 Attrition mostly causes wear of the incisal and occlusal surfaces of the teeth. Attrition has been associated with masticatory force and parafunctional activity activity〔 such as bruxism. A degree of attrition is normal, especially in elderly individuals.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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