Root Canal Wall Dentin Structure in Uninstrumented but Cleaned Human Premolars: A Scanning Electron Microscopic Study

Area of Science:

• Endodontics
• Dental Anatomy
• Biomaterials

Background:

• Conventional endodontic instrumentation alters natural root canal anatomy.
• Energy-driven systems like the GentleWave system offer minimally invasive cleaning alternatives.
• Previous research has not fully characterized root canal anatomy after noninstrumentation cleaning.

Purpose of the Study:

• To examine the root canal wall anatomy of premolar teeth after cleaning with a noninstrumentation method.
• To evaluate the efficacy of the GentleWave system in removing organic tissue and debris.
• To compare the dentin surface morphology between treated and untreated root canals.

Main Methods:

• Twenty-four human premolars were accessed and patency confirmed with a #10 K-file.
• Seventeen teeth were treated with the GentleWave system and 3% sodium hypochlorite.
• Scanning electron microscopy analyzed dentin surface parameters in coronal, middle, and apical thirds.

Main Results:

• The GentleWave system removed all organic tissue and debris, exposing clean mineralized dentin.
• Uninstrumented canals exhibited irregular dentin structures, including novel fingerlike projections.
• Isthmus areas showed minimal dentinal tubule openings; treated canals preserved dentin structures.

Conclusions:

• Noninstrumentation cleaning with the GentleWave system preserves root canal dentin structure.
• This method effectively removes organic tissue and debris, even from complex anatomical areas.
• The study revealed diverse dentin wall anatomy, particularly in the middle and apical regions.