Comparative Evaluation of a Dynamic Navigation System versus a Three-dimensional Microscope in Retrieving Separated...

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Separated rotary Nickel-Titanium files pose a significant challenge in endodontic retreatment.
• Effective retrieval methods are crucial to avoid procedural complications and preserve root canal anatomy.

Purpose of the Study:

• To compare the effectiveness of dynamic navigation systems versus three-dimensional microscopes for retrieving fractured Nickel-Titanium rotary files.
• To evaluate success rate, canal aberration, treatment time, and volumetric changes associated with each guidance system.

Main Methods:

• Sixty fractured Nickel-Titanium rotary files were retrieved from 30 maxillary first bicuspids using trepan burs and an extractor system.
• Teeth were divided into two groups: dynamic navigation system guidance and three-dimensional microscope guidance.
• Key outcome measures included retrieval success, canal aberration, time, and root canal volumetric changes.

Main Results:

• The three-dimensional microscope group demonstrated a trend towards a higher success rate, though not statistically significant.
• Microscope guidance resulted in significantly lower canal aberration, reduced treatment time, and minimal root canal volume changes compared to dynamic navigation.
• No significant difference was found in the success rate between the two guidance systems (P > 0.05).

Conclusions:

• While dynamic navigation can retrieve separated instruments, it is less effective than three-dimensional microscope guidance.
• Three-dimensional microscope guidance offers superior outcomes in managing procedural errors and preserving root canal morphology during file retrieval.