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Comparing the Effectiveness of a Robotic and Dynamic Navigation System in Fiber Post removal: An In Vitro Study.

Duo Zhou1, Fulu Xu1, Jiayun Dai1

  • 1Department of Endodontics and Operative Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, China; State Key Laboratory Cultivation Base of Research, Prevention and Treatment for Oral Diseases (Nanjing Medical University), Nanjing, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine (Nanjing Medical University), Nanjing, China.

Journal of Endodontics
|November 14, 2025
PubMed
Summary

The robotic system (RS) demonstrated superior accuracy and efficiency in fiber post removal compared to the dynamic navigation system (DNS) and freehand technique (FH). This in vitro study highlights RS as a promising tool for improved clinical outcomes in endodontic procedures.

Keywords:
Dynamic navigation systemfiber post removalguided endodonticsrobotic system

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Area of Science:

  • Endodontics
  • Dental Technology
  • Minimally Invasive Dentistry

Background:

  • Fiber post removal is a critical step in retreatment of endodontically treated teeth.
  • Conventional freehand techniques can be challenging, risking procedural errors.
  • Robotic systems (RS) and dynamic navigation systems (DNS) offer potential improvements in accuracy and efficiency.

Purpose of the Study:

  • To compare the effectiveness of a robotic system (RS) versus a dynamic navigation system (DNS) and the freehand technique (FH) for fiber post removal.
  • To evaluate accuracy (coronal and apical deviation, angular deflection) and operational efficiency (time) of each technique.

Main Methods:

  • An in vitro study utilizing 36 3D-printed teeth with cemented fiber posts.
  • Teeth were randomly assigned to RS, DNS, or FH groups (n=12 each).
  • Micro-computed tomography and model scans were used to assess pre- and post-instrumentation deviations and operation time.

Main Results:

  • No significant difference in coronal deviation among the groups.
  • The RS group exhibited significantly lower apical deviation (0.23 mm) and angular deflection (0.94°), with the shortest operation time (0.81 min).
  • The DNS group showed intermediate results, while the FH group had the greatest deviations and longest operation time (3.64 min).

Conclusions:

  • The robotic system (RS) demonstrated superior accuracy and efficiency in fiber post removal compared to dynamic navigation system (DNS) and freehand technique (FH) in this in vitro study.
  • RS shows promise for enhancing precision and reducing procedural time in endodontic post removal.
  • Further clinical studies are warranted to validate these findings in vivo.