[Introduction and interpretation of the European Federation of Periodontology S3 level clinical practice guideline for treatment of periodontitis].

2018 international classification of periodontal and implant diseases relates the classifications with the approaches of prevention and treatment based on the stages and grades of disease. European Federation of Periodontology (EFP) evaluated the available evidences following the methodological guidance of the Association of Scientific Medical Societies in Germany and the Grading of Recommendations Assessment, Development and Evaluation (GRADE), and published the EFP S3 level clinical practice guideline for the treatment of stage Ⅰ-Ⅲ and Ⅳ periodontitis in 2020 and 2022, respectively. The present manuscript gives introduction and interpretation based on the EFP S3 level clinical practice guideline and Chinese national conditions. On the base of the diagnostic key points of staging and grading, it introduces in detail the step treatment procedures of stageⅠ-Ⅲ periodontitis as well as the multi-disciplinary treatment procedures of stage Ⅳ periodontitis, compares the similarities and differences between the step and phase procedures, and then proposes a strategy for determining the recall interval more suitable for Chinese clinicians. The present manuscript aims to help dentists to learn and grasp the key points more quickly and accurately on the clinical application of the guideline and to assist them in making the optimal treatment plans after judging and evaluating the specific clinical circumstances, so as to maximize the chances of favorable outcome.2018牙周病和植体周病国际新分类通过分期和分级将疾病分类与预防和治疗方法联系起来，欧洲牙周病学会（European Federation of Periodontology，EFP）依据德国科学医学协会的方法指南和推荐分级的评估、制订与评价原则，对循证医学证据的质量和强度进行评估，先后于2020和2022年发布牙周炎Ⅰ~Ⅲ期和Ⅳ期临床诊疗指南。本文结合中国国情对EFP Ⅰ~Ⅳ期牙周炎S3级临床实践指南进行介绍和应用解读，在简要回顾牙周炎分期分级诊断要点的基础上，重点介绍了分期指导下的Ⅰ~Ⅲ期牙周炎分步临床治疗程序，简要介绍牙周炎Ⅳ期多学科治疗程序，对比其与分阶段治疗的异同，并提出适合我国国情的牙周炎患者牙周复查间隔确定方法，旨在帮助临床医师快速学习该临床实践指南，准确掌握指南的临床应用要点，并能基于疾病情况选择优化的诊疗方案，最终获得更好的治疗效果。.