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In toxicology, the margin of exposure (or MOE) of a substance is the ratio of its no-observed-adverse-effect level to its theoretical, predicted, or estimated dose or concentration of human intake. [1] It is used in risk assessment to determine the dangerousness of substances that are both genotoxic and carcinogenic. [2]
Due to the close proximity of the dental health care workers to the patients, dental procedures involving aerosol production are not advisable in patients who tested positive for COVID-19. [34] On March 16, 2020, the American Dental Association advised dentists to postpone all elective procedures. [35]
The REACH regulation defines them as exposure levels beneath which a substance does not harm human health. [1] According to the EU REACH legislation , manufacturers and importers of chemical substances are required to calculate DNELs as part of their chemical safety assessment (CSA) for any chemicals used in quantities of 10 tonnes or more per ...
OSHA's PEL for noise exposure is 90 decibels (dBA) for an 8-hour TWA. Levels of 90-140 dBA are included in the noise dose. [4] PEL can also be expressed as 100 percent “dose” for noise exposure. When the noise exposure increases by 5 dB, the exposure time is cut in half. [5] According to OSHA, a 95dBA TWA would be a 200 percent dose. [6]
Occupational exposure banding, also known as hazard banding, is a process intended to quickly and accurately assign chemicals into specific categories (bands), each corresponding to a range of exposure concentrations designed to protect worker health.
Burton's line, also known as the Burton line or Burtonian line, is a clinical sign found in patients with chronic lead poisoning.It is a very thin, black-blue line visible along the margin of the gums, at the base of the teeth.
Exposure analysis is the science that describes how an individual or population comes in contact with a contaminant, including quantification of the amount of contact across space and time. 'Exposure assessment' and 'exposure analysis' are often used as synonyms in many practical contexts. Risk is a function of exposure and hazard.
The dental dam sheets are predominantly made from rubber materials such as latex or nitrile and tend to be 15 cm by 15 cm in length and width. The thickness of each dam sheet is approximately between 0.14 mm and 0.38 mm but the size, shape, colour and material that the dam sheet is made from can vary with differing manufacturers.