China Journal of Oral and Maxillofacial Surgery ›› 2023, Vol. 21 ›› Issue (5): 479-485.doi: 10.19438/j.cjoms.2023.05.009

• Original Articles • Previous Articles     Next Articles

Study on risk model for postextraction bleeding of mandibular third molars

WANG Jian-rong1, SUN Jing2, ZHAO Shu-hong1, SHANG Jiang2   

  1. 1. Department of Nursing, 2. Department of Oral and Maxillofacial Surgery, Yantai Stomatological Hospital. Yantai 264000, Shandong Province, China
  • Received:2022-11-28 Revised:2023-02-18 Online:2023-09-20 Published:2023-10-11

Abstract: PURPOSE: To explore the risk factors of bleeding after mandibular third molar extraction and establish a prediction model to provide reference for clinical decision-making. METHODS: Clinical data of 610 cases of mandibular third molar extraction were collected for the study. Association of postextraction bleeding with the patient demographic variables (gender), tooth variables(position, impacted angle) and other variables (periodontitis, intraoperative anesthetic drugs, flap, postoperative treatment, hemostatic materials, patient compliance). SAS 9.4 software package was used to analyze the data. RESULTS: The incidence of postextraction bleeding was 10.33% in 610 patients after mandibular third molars extraction, and 63 patients had postextraction bleeding. Multivariate logistic regression analysis showed that the position, impacted angle, flap, postoperative treatment, patient compliance were independent risk factors for postextraction bleeding of mandibular third molars. The results showed that the prediction model had good differential validity(AUC=0.916), high calibration degree (P=0.605), and certain clinical application value. CONCLUSIONS: The position, impacted angle, flap, postoperative treatment and patient compliance are not only risk factors for postextraction bleeding, but also predictive factors for predictive models.

Key words: Third molar, Wisdom teeth, Tooth extraction, Bleeding, Risk factors, Prediction model

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