attrition

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attrition

 [ah-trĭ´shun]
the wearing away of a substance or structure (such as the teeth) in the course of normal use.

at·tri·tion

(ă-trish'ŭn),
1. Wearing away by friction or rubbing.
2. In dentistry, physiologic loss of tooth structure caused by the abrasive character of food or by bruxism. Compare: abrasion.
[L. at-tero, pp. -tritus, to rub against, rub away]

attrition

[ətrish′ən]
Etymology: L, atterere, to wear away
1 the process of wearing away or wearing down by friction.
2 the physiological wearing away of the teeth such as from normal mastication, grinding, bruxism, premature contacts, or abnormal tooth structures. See abrasion, abfraction, erosion.
3 individuals who withdraw or are dismissed from a study or program of study.

attrition

The dropping out of a participant in a trial or study.

at·tri·tion

(ă-trish'ŭn)
1. Wearing away by friction or rubbing.
2. In dentistry, physiologic loss of tooth structure caused by normal wear inherent in the aging process, as well as by the abrasive character of food or by bruxism.
Compare: abrasion
3. The loss of participants over the course of a study, which can create bias and threaten the internal validity of the study.
[L. at-tero, pp. -tritus, to rub against, rub away]

at·tri·tion

(ă-trish'ŭn)
1. In dentistry, physiologic loss of tooth structure caused by normal wear inherent in the aging process, as well as by the abrasive character of food or by bruxism.
2. Wearing away by friction or rubbing.
[L. at-tero, pp. -tritus, to rub against, rub away]

attrition (ətrish´ən),

n the normal loss of tooth substance resulting from friction caused by physiologic forces.
Enlarge picture
Attrition.

attrition

the physiological wearing away of a substance or structure in the course of normal use.

dental attrition
see dental attrition.
References in periodicals archive ?
This establishes a baseline that can be used to document changes in the building electrical system from normal wear and tear.
I e-mailed Ford but was told they agreed with the mechanic that it was normal wear and tear.
Coverage is for break-downs due to normal wear and tear, and service technicians are available 24 hours a day to repair covered systems.
While the center was adequately equipped at its dedication May 25, 1978, normal wear and tear created special needs.
As structured for the program offered through Philadelphia Water Supply, PipeGuard(TM) has no deductible and can pay up to $5,000 for the repair or replacement of a residential customer's water service line in the case of damage caused by normal wear and tear.