You should expect about 3 to five years (possibly 7 years) of use from the composite and as many as 20 years or longer from an amalgam restoration. Actually a well-cared-for amalgam filling can last a lifetime, so the expensiveness of the filling really becomes a minor consideration.
This shows how well the kidneys are performing. In a normal healthy person the GFR stays close to the same value all of the time. The test is done by taking blood from a person and sending it to a laboratory. Normal values are between 90ml/min and 110ml/min.
The glomerular filtration rate or GFR is the amount of fluid filtered from the capillaries into the Bowmans capsule of the kidneys per unit time. The GFR can be expressed as the following formula: GFR = Kf x net filtration pressure. Kf = the filtration coefficent.