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Fibre Post Removal Using Dynamic Navigation System and Autonomous Robotic System: An In Vitro Study.

Zhiming Cui1, Guangdao Zhang2, Bo Lv1

  • 1Department of Endodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, China.

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|May 4, 2026
PubMed
Summary
This summary is machine-generated.

The autonomous robotic system (ATR) and dynamic navigation system (DNS) are more efficient and preserve more dentine during fibre post removal than the microscope-assisted ultrasonic (MU) technique. These advanced systems show promise as alternatives for dental procedures.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Robotic Surgery

Background:

  • Fibre post removal is crucial in endodontic retreatment.
  • Conventional microscope-assisted ultrasonic (MU) techniques can be time-consuming and may lead to significant dentine loss.
  • Advancements in navigation and robotic systems offer potential improvements in dental procedures.

Purpose of the Study:

  • To compare the efficiency, dentine preservation, and accuracy of dynamic navigation system (DNS) and autonomous robotic system (ATR) techniques against the conventional microscope-assisted ultrasonic (MU) technique for fibre post removal.
  • To evaluate the clinical applicability of novel navigation technologies in endodontic post removal.

Main Methods:

  • Sixty 3D-printed maxillary premolars with fibre posts were divided into three groups (n=20): DNS, ATR, and MU.
  • DNS and ATR involved initial bur removal guided by the system, followed by ultrasonic use.
  • MU used microscope-assisted ultrasound throughout. Operative time, dentine loss, and path deviation were assessed via CBCT scans.

Main Results:

  • All posts were removed successfully without perforation.
  • ATR showed the shortest operative time (14 min 02 s), followed by DNS (21 min 26 s), and MU (24 min 41 s) (p < 0.05).
  • DNS (0.24 ± 0.04 mm) and ATR (0.25 ± 0.03 mm) resulted in significantly less dentine loss than MU (0.32 ± 0.04 mm) (p < 0.05), with no significant difference between DNS and ATR.

Conclusions:

  • Both DNS and ATR systems demonstrated superior efficiency and dentine preservation compared to the conventional MU technique for fibre post removal.
  • DNS and ATR are promising alternatives for fibre post removal, offering comparable accuracy.
  • Further in vivo validation with diverse tooth anatomies and thermal analysis is recommended.