A micro-computed tomographic assessment of root canal preparation with conventional and different rotary files in primary teeth and young permanent teeth.

Background: Root canals of primary teeth are commonly prepared with endodontic files that are originally manufactured for permanent teeth.

Aim: This micro-computed tomography (micro-CT) study evaluated and compared the changes in root canal morphology after preparation with different conventional and rotary files in primary teeth and young permanent teeth.

Design: Seventy-two extracted primary and permanent molars were selected and randomly assigned to three subgroups according to the file systems used (n = 12/each).