Correspondence between fiber post and drill dimensions for post canal preparation.

Purpose: To compare fiber posts of several calibers and trademarks to their corresponding root canal preparation drills.

Methods: Three widely used endodontic post brands and their drills were evaluated: Exacto, ParaPost Taper Lux, and Macro-Lock Illusion X-RO. Fiber posts and drills were microphotographed with a scanning electron microscope and images were analyzed using ImageJ image processing software.