Influence of the instrumentation technique and apical preparation diameter on calcium hydroxide filling in simulated curved canals.

Objective: This study evaluated the influence of the instrumentation technique and apical preparation size on the filling capacity of a calcium hydroxide (CH)-based paste.

Materials And Methods: Fifty simulated curved canals were prepared in acrylic blocks (five groups; n = 10 each). In three groups, the canals were preflared with Gates-Glidden drills and the apical stop was prepared with #25, 30 or 35 Flexofile files.