The aim of this clinical trial was to compare the clinical performances of a glass ionomer
restorative system with a micro hybrid resin based composite in class I and class II
cavities. A total of 140 (80 class I and 60 class II) lesions in 59 patients were restored
with a glass ionomer restorative system (Equia) or a micro hybrid composite(Gradia Direct).
Restorations were evaluated at baseline and yearly during 6 years according to the
modified-USPHS criteria. Data were analyzed with Cohcran's Q and McNemar's tests (p<0.05).