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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.
International Endodontic Journal
|May 4, 2026
Summary
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.
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.
