2026-06-30 東京科学大学
図1. 単根歯及び複根歯におけるI-J-U分類それぞれの骨吸収のイメージ
垂直方向の骨吸収と、根尖部の骨吸収の組み合わせでI型、J型、U型と分類する
＜関連情報＞
- https://www.isct.ac.jp/ja/news/j2fyi6a2n933#top
- https://onlinelibrary.wiley.com/doi/10.1111/jcpe.70142
歯内歯周病変治療後の歯の生存に関する予後評価：後向き研究 Prognostic Assessment of Tooth Survival After Treatment of Endodontic-Periodontal Lesions: A Retrospective Study
Fumihiko Kimura, Risako Mikami, Koji Mizutani, Daisuke Kido, Kohei Takeda, Keita Nakagawa, Shu Takemura, Hiromi Kominato, Natsumi Saito, Tatsuro Seike, Eri Sakaniwa,…
Journal of Clinical Periodontology Published: 19 May 2026
DOI:https://doi.org/10.1111/jcpe.70142
ABSTRACT
Aim
This retrospective cohort study aimed to identify pretreatment prognostic factors for tooth survival in teeth with endodontic-periodontal lesions (EPLs).
Materials and Methods
Teeth with EPLs treated according to a standardised clinical protocol involving periodontal and endodontic treatments were included. Clinical parameters were measured, and the EPL grade was classified according to the 2017 World Workshop criteria. Based on the radiographic characteristics, lesions were categorised as I-shaped (unilateral intrabony defect without apparent apical radiolucency), J-shaped (unilateral intrabony defect with apical radiolucency) and U-shaped (bilateral intrabony defects with apical radiolucency). Survival-time analysis was performed.
Results
Of the 187 teeth included, 117 survived over the mean observation period of 3.1 ± 2.1 years (maximum, 8.4 years). The estimated 1- and 5-year tooth survival rates were 83.8% and 58.9%, respectively. Multivariate analysis identified age, EPL grade, probing depth (PD), periapical index, bone loss and I-J-U subclassification as significant prognostic factors for tooth survival. The I-J-U subclassification was significantly associated with tooth survival, suggesting its potential value in prognostic assessment.
Conclusion
This retrospective cohort study identified age, EPL grade, PD and radiographic shape of bone loss as predicting factors for tooth survival in teeth with EPLs.
