Comparative evaluation of remaining dentin thickness using single file, two file, and multiple rotary file system -...

Area of Science:

• Endodontics
• Dental Materials Science
• Biomaterials

Background:

• Endodontic treatment success depends on canal shaping, disinfection, and obturation.
• Remaining dentin thickness (RDT) is critical for tooth biomechanical resilience and longevity.

Purpose of the Study:

• To evaluate the impact of single-file, two-file, and multiple-file rotary instrumentation systems on RDT.
• To compare the dentin-preserving capabilities of different rotary endodontic systems.

Main Methods:

• An in vitro study using 60 human mandibular premolars.
• Teeth were randomly assigned to three groups: single-file (One Curve), two-file (2Shape), and multiple-file (Hero Gold) systems.
• Cone-beam computed tomography (CBCT) was used to assess RDT at standardized depths before and after instrumentation.

Main Results:

• A statistically significant difference in RDT was found among all groups.
• The single-file system (Group I) resulted in the highest mean RDT.
• The two-file system (Group II) and multiple-file system (Group III) showed progressively less RDT.

Conclusions:

• Single-file rotary systems preserve more dentin compared to two-file and multiple-file systems.
• Less aggressive cutting by single-file systems contributes to greater RDT.
• Preservation of RDT is vital for improving the biomechanical strength and longevity of endodontically treated teeth.