FAST REVISION
Physiology
The conversion of 7-dehydrocholesterol to cholecalciferol (vitamin D3) in the skin is initiated by the action of UVB light from sunlight, not by any specific hormone.
Dental Materials
The specification requires that the dimensional change for a cylindrical specimen must fall within the range of -15 to +20 ?m/cm for 5 minutes to 124 hours after setting.
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