Analysis of Cause of Endodontic Failure of C-Shaped Root Canals

الملخص EN

The purpose of this study was to analyze various characteristics and classification of C-shaped root canals and evaluate the causes of endodontic failure of C-shaped root canals by examining the resected root surface with an endodontic microscope and a scanning electron microscope (SEM).

Forty-two teeth with C-shaped root canals were included in this study and had undergone intentional replantation surgery.

Before surgery, periapical radiography and cone-beam computed tomography were taken.

The root canal configuration was analyzed and classified according to Melton’s classification at coronal and apical level.

After injection of 1 : 100,000 epinephrine with 2% lidocaine, the tooth was carefully extracted.

After the root-end resection, the resected root surface was examined using an operating microscope and SEM.

Mandibular second molars were most frequently involved teeth (90.4%).

The most frequently observed root canal configurations were C1 at the coronal level (45.2%) and C3 at the apical 3 mm level (45.2%).

The most common cause of failure for a C-shaped root canal treatment was a leaky canal (45.2%), followed by an isthmus (23.8%), missing canal, overfilling, and iatrogenic problems.

In conclusion, C-shaped root canals were most frequently found in mandibular second molars.

The most common cause of failure was a leaky canal and isthmus.