title: An epidemiologic study of tooth retention after nonsurgical endodontic treatment in a large population in Taiwan.
abstract: In this study, tooth retention and untoward events were assessed over a 5-year follow-up period for 1,557,547 teeth receiving nonsurgical root canal treatment (NSRCT) in Taiwan in 1998. We found that 1,446,199 (92.9%) of teeth receiving NSRCT were retained in the oral cavity 5 years after treatment and that a total of 111,348 (7.1%) of the studied teeth were extracted. Untoward events occurred in 159,680 (10.3%) teeth during the 5-year follow-up period. Of this small subpopulation, nonsurgical retreatment was performed for 50,587 teeth (31.7%), apical surgery was performed on 4,502 (2.8%) teeth, and extractions were performed on 104,591 (65.5%) teeth. Approximately 40% of the nonsurgical retreatments and 81% of the apical surgeries occurred in the first follow-up year. However, the yearly incidence of tooth extractions was nearly even within the 5-year study period. We conclude that NSRCT is a valuable dental procedure because of the high rate (92.9%) of tooth retention 5 years after NSRCTs in Taiwan.
authors.affiliation: Department of Health, The Executive Yuan, Taipei, Taiwan.
authors.forename: Shih-Chung
authors.initials: SC
authors.lastname: Chen
authors.forename: Ling-Huey
authors.initials: LH
authors.lastname: Chueh
authors.forename: Chuhsing Kate
authors.initials: CK
authors.lastname: Hsiao
authors.forename: Miao-Yu
authors.initials: MY
authors.lastname: Tsai
authors.forename: Shih-Chang
authors.initials: SC
authors.lastname: Ho
authors.forename: Chun-Pin
authors.initials: CP
authors.lastname: Chiang
mesh_terms: D001047:Apicoectomy / Q000706:statistics & numerical data; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D019233:Retreatment / Q000706:statistics & numerical data; D012390:Root Canal Therapy / Q000009:adverse effects / Q000706:statistics & numerical data*; D013624:Taiwan / Q000453:epidemiology; D014081:Tooth Extraction / Q000706:statistics & numerical data; D016388:Tooth Loss / Q000453:epidemiology*; D016896:Treatment Outcome