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.
For adults it is between 100-130 ml/min/1.73m2. For children a GFR at 110 ml/min/1.73m2 is normal. GFR's are used to assess kidney damage or kidney disease. Normal GFR (glomerular filtration rate of the kidney) should be above 60.