Evaluation of Root Dentin Damage during Retreatment Procedure using Various Engine-Driven Retreatment File Systems-A...

Area of Science:

• Endodontics
• Dental Materials Science
• Biomaterials Engineering

Background:

• Root canal retreatment is crucial for endodontic success.
• Engine-driven nickel-titanium (NiTi) files are commonly used for gutta-percha removal.
• Assessing potential root dentin damage during retreatment is essential.

Purpose of the Study:

• To evaluate and compare root dentin damage caused by different engine-driven NiTi retreatment file systems.
• To quantify dentin volume loss using micro-computed tomography (micro-CT).

Main Methods:

• Sixty mandibular premolars were prepared to a standardized length.
• Root canals were filled with gutta-percha and sealer.
• Teeth were randomly assigned to three groups using MTwo, ProTaper Universal, or Edge File XR retreatment files.
• Micro-CT scans were performed pre- and post-retreatment to measure dentin volume loss at apical, middle, and cervical thirds.

Main Results:

• All file systems effectively removed filling material.
• The Edge File XR group exhibited significantly less root dentin damage compared to MTwo and ProTaper Universal groups.
• Lower dentinal injury was observed in the apical third for Edge File XR and MTwo systems.

Conclusions:

• Engine-driven NiTi retreatment files can effectively remove obturating material.
• The Edge File XR system appears to cause less root dentin damage than MTwo and ProTaper Universal systems.
• Further research is needed to fully understand the long-term implications of retreatment-induced dentin damage.