Probability of removing fractured instruments from root canals

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Instrument fracture is a common complication in endodontic therapy.
• Understanding the factors influencing fracture and successful retrieval is crucial for clinical practice.

Purpose of the Study:

• To analyze the incidence, location, and retrieval success of fractured endodontic instruments.
• To compare findings with previous studies on instrument retrieval.

Main Methods:

• A clinical case series analyzed 97 endodontic cases with fractured instruments over 18 months.
• Fractured instruments were retrieved using ultrasonic files, K-files, and specialized removal techniques.
• Location, time to removal, and success of retrieval were recorded.

Main Results:

• 87% of fractured instruments were successfully removed.
• Curved canals showed a significantly higher incidence of instrument fractures (P < 0.05).
• Rotary instruments fractured more frequently in curved canals and mesial roots of lower molars.

Conclusions:

• Curved canals present a higher risk for endodontic instrument fracture.
• Successful retrieval rates are high (87%), but decrease with increased treatment time.
• Operating microscopes are essential for advanced instrument retrieval techniques.