The 5-Year Survival Rate of Nonsurgical Endodontic Treatment: A Population-based Cohort Study in Korea

Youngjun Kwak, Jungkyu Choi, Kiyeol Kim, Su Jung Shin, Sunil Kim, Euiseong Kim

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Introduction: The purpose of the current population-based study was to analyze the 5-year survival rate of teeth that received nonsurgical endodontic treatment. Specifically, the variables affecting the 5-year survival rates of endodontically treated teeth were analyzed. Methods: The present study included all endodontically treated teeth reported in 2010 in the National Health Insurance Cohort database of the Republic of Korea. By tracing the dental records of the sample to the end of 2015, the 5-year survival rates of the initial root canal treatment (RCT) and re-RCT were analyzed. Gender, age, institution type, diagnosis, arch type, tooth type, number of visits, and rubber dam usage were included in the analyses as confounding variables. Results: In total, 2,866,749 teeth received initial RCT, and 173,429 teeth received re-RCT. Five-year survival rates were 90.85% and 88.42%, respectively. The survival rate of teeth that received initial RCT was significantly higher than that of those that received re-RCT. Specifically, re-RCT showed a significantly higher rate of extraction within 12 months than during other intervals. Furthermore, the following characteristics significantly positively affected the 5-year tooth survival rate: being female, <20 years of age, hospital as the institution type, mandibular teeth, anterior teeth, initial RCT, and use of rubber dam. Conclusions: Because of its high 5-year survival rate, endodontic treatment is an effective method for maintaining natural teeth.

Original languageEnglish
Pages (from-to)1192-1199
Number of pages8
JournalJournal of endodontics
Issue number10
Publication statusPublished - 2019 Oct

Bibliographical note

Funding Information:
This study was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (grant no. 2018R1D1A1A09081906 ).

Publisher Copyright:
© 2019 American Association of Endodontists

All Science Journal Classification (ASJC) codes

  • Dentistry(all)


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