Periapical changes following root-canal treatment observed 20-27 years postoperatively.

Area of Science:

• Endodontics
• Dental Radiology

Background:

• Assessing long-term outcomes of root canal treatment (RCT) is crucial for understanding treatment success rates.
• Periapical health following RCT can be dynamic, with changes potentially occurring years after initial treatment.

Purpose of the Study:

• To evaluate periapical changes occurring 20-27 years after root canal treatment.
• To determine the long-term success and failure rates of root canal procedures.

Main Methods:

• A cohort of 265 root-filled teeth, treated by undergraduate students, was assessed using intraoral radiographs.
• Radiographs were taken at two time points: 10-17 years and 20-27 years post-treatment.
• A rigorous diagnostic process involving multiple examiners was employed to identify periapical changes and unfavorable outcomes.

Main Results:

• At the 10-17 year follow-up, 6.4% of roots with prior radiolucencies showed favorable outcomes.
• Periapical radiolucencies developed in 1.5% of other roots between 20-27 years post-treatment.
• The overall radiographic failure rate was 4.9%, with 86.4% of cases showing normal periapical findings at the final follow-up.

Conclusions:

• Extending the follow-up period for root canal treatment assessment to 20-27 years revealed late periapical changes.
• The extended observation period indicated more treatment successes than failures.
• Delayed healing, often due to excess root filling material, was a significant factor in favorable long-term outcomes.