Microleakage comparison of apical seal of plastic versus metal Thermafil root canal obturators

This study compared the apical seal of plastic versus metal Thermafil obturators in extracted human teeth. The obturated teeth were evaluated radiographically for the extent and adaptation of the filling obturator. No difference was seen between plastic and metal for over- or underfilling. Voids were seen more often in smaller sizes of both plastic and metal obturators. Obturated teeth were stained in India ink, decalcified, and cleared. Microleakage evaluation of the transparent teeth showed no statistical difference between metal and plastic obturators.