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Objectives Reciprocating endodontic one-file systems are a comparatively new method for root canal shaping. Even though the mechanical properties are comparable to modern rotating mechanical systems, data about subjective assessment and application quality are scarce. This study evaluates the reciprocating one-file system in undergraduate education.  Materials and Methods A total of 42 undergraduate students without experience regarding reciprocating file systems filled in a questionnaire in four different points in time (t1–t4) anonymously. The questionnaire was based on a numerical rating scale ranging from 0 to 10.  Statistical Analysis A least significant difference post-hoc analysis comparing the group average values was performed. The adjusted level of significance was p &lt; 0.004 after Bonferroni correction.  Results All rating scores increased after the first theoretical instruction. After the first practical training in artificial root canals in resin blocks and extracted teeth (t2), the estimation of “time efficiency” (p = 0.002), “handling” (p &lt; 0.001), and “overall impression” (p &lt; 0.001) improved significantly. The “overall impression” remained constant and showed no significant changes after the first practical training.  Conclusions Reciprocating systems seem to show a good acceptance among first time users. Initial concerns about “work safety” decrease during every step of the educational process. Reciprocating one-file systems are a safe and well-accepted method in undergraduate teaching.

Undergraduate Students’ Acceptance of a Reciprocating One-File System for Endodontic Treatment