self-timed dentist.

[Vera_KF]

Пожалуйста, помогите перевести.
self-timed

Слово встречается в следующем контексте:Plaque coverage was also assessed on the same days immediately after brushing with the test product (40
seconds, self timed) and mid-afternoon (to evaluate plaque removal and daytime plaque formation respectively).

Заранее спасибо

[SirReal]

не моя область, но м.б. "с самостоятельным контролем времени"?