[Clinically controlled experiment on frequency of secondary caries in amalgam and mold fillings]

The purpose of the present controlled clinical study was to assess and compare the secondary caries rate of amalgam fillings and castings, respectively. 154 pairs of fillings (class I and II) were included in the trial and the time of observation was two years. The fillings were made under equal clinical conditions particularly with regard of dentist's care. The secondary caries rate of the amalgam fillings was 20.1% and of the castings 18.2%, respectively. The difference was not significant (chi-square-test). The reason of that is probably the similar care of the manufacturing of fillings. Therefore the authors recommend amalgam fillings for the restoration of class I and II cavities.