[A quantitative method for the measurement of the marginal space using Ca45]

A survey of the most known methods of testing for marginal fit is followed by the description of the determination of marginal leakage by means of autoradiography. 45Ca was used as a radioactive isotope. The most favourable times of penetration and exposure are indicated. Provided that certain standards are respected, the magnified autoradiograms may be measured and the values obtained can be used for comparisons. The applicability and the error range of the method were tested in 2 series of Super-Syntrex fillings.