A relationship between approximal tooth surface morphology and creation of overhang filling is displayed. After drilling of approximal cavity, the gingival cavity margin was evaluated as concave or non-concave. After making the filling, on bite wing radiogram the filling quality was evaluated. The overall percentage of overhang filling in our study (up to 1mm of everhang material) was 6.36%, much less then could be found in literature (16–85% according the diagnostic method). There was not proven any statistical relationship between the risk of making overhang filling and approximal tooth morphology.

        Key words: overhang filling – approximal filling – clinical diagnostics