Se-Jin Han

Background/Objectives: To determine whether preoperative CT-measured lesion volume independently predicts surgical recurrence of MRONJ, and whether surgical approach influences recurrence after adjusting for lesion volume and clinical confounders. Methods: We conducted a retrospective multi-center cohort study of 1007 patients with single-lesion MRONJ who underwent surgery at five tertiary institutions in the Republic of Korea (2015–2023), with a minimum two-year follow-up. Preoperative lesion volume was measured by CT segmentation (Osteomyelitis Analyzer SW, version 2.0.6; Aemasue, Seoul, Republic of Korea) with cross-institutional consensus validation. Surgical recurrence was defined as re-fulfillment of 2022 AAOMS criteria after confirmed mucosal healing (Hayashida H1). Three logistic regression models of increasing adjustment were constructed a priori; reporting adhered to STROBE. Results: Recurrence occurred in 108 patients (10.7%) and increased in a dose–response pattern across volume quartiles (Q1 5.6%, Q2 9.2%, Q3 12.0%, Q4 16.0%; Cochran–Armitage trend Z = 3.89, p < 0.001), with a 2.9-fold relative gradient (absolute difference 10.4 percentage points). Surgeons preferentially selected aggressive approaches for larger lesions (OR = 1.651; 95% CI 1.338–2.037; p < 0.001). After adjustment, surgical approach was not an independent predictor in any model (fully adjusted OR = 0.735; 95% CI 0.381–1.419; p = 0.360), whereas lesion volume remained independent throughout (OR = 1.543–1.625 per log-unit; all p < 0.001; c-statistic 0.625–0.699). Conclusions: CT-measured preoperative lesion volume is an independent predictor of MRONJ surgical recurrence; we did not detect an independent surgical-approach effect, although the sample could not exclude a clinically meaningful one. Among measured factors, lesion volume—rather than surgical approach—was the principal predictor of recurrence risk, supporting consideration of routine CT volumetry in preoperative assessment, pending prospective validation.

Il-Kwon Jung and Se-Jin Han. Oral Biol Res 2025;49:. https://doi.org/10.21851/obr.25.026

Min-Soo Kim, Se-Jin Han. JKAOMS 2023;49:208-13. https://doi.org/10.5125/jkaoms.2023.49.4.208

Min-Soo Kim, Da-Woon Kwack, and Se-Jin Han. Oral Biol Res 2023;47:67-9. https://doi.org/10.21851/obr.47.02.202306.67

Objectives: Contemporary biometric technologies have been gaining traction in both public and private security sectors. Facial recognition is the most commonly used biometric technology for this purpose. We aimed to evaluate the ability of a publicly available facial recognition application program interface to calculate similarity scores of presurgical and postsurgical photographs of patients who had orthognathic surgery. Materials and Methods: Presurgical and postsurgical photographs of 75 patients who had orthognathic surgery between January 2018 and Novem-ber 2020 in our department were used. Frontal photographs of patients in relaxed and smiling states were taken. The patients were classified into three groups: Group 2 had one-jaw surgery, Group 3 had two-jaw surgery to correct mandibular prognathism, and Group 4 had two-jaw surgery to correct facial asymmetry. For comparison, photographs of 10 participants were used as controls (Group 1). Two facial recognition application programs (Face X and Azure) were used to assess similarity scores. Results: The similarity scores in the two programs showed significant results. The similarity score of the control group, which did not undergo orthog-nathic surgery, was the highest. The results for Group 2, Group 3, and Group 4 were higher in the order of Group 2, Group 3, and Group 4. Conclusion: In this study, all orthodontic patients were recognized as the same person using the face recognition program before and after surgery. A significant difference in similarity results was obtained between the groups with both Face X and Azure and in both relaxed and smiling states.

In order to strategically respond to COVID-19, the most important measure is to control COVID-19 by minimizing the spread of the coronavirus and preventing related diseases and morbidity. In dental and oral maxillofacial surgery treatment procedures, it is unavoidable that the patient's saliva and blood are generated in the form of droplets or aerosols. Recently, new variants of COVID-19 virus had been reported and cause more infection and faster spread. The risk of breakthrough infection, which occurs even after vaccination, is increasing. Therefore, this recommendation was prepared to help prevent infection of oral and maxillofacial surgeons exposed to such environments, and to maximize the safety of patients and medical staff.

Sejin Han, DDS, MSD, PhD. JKAOMS 2021;47:339-40. https://doi.org/10.5125/jkaoms.2021.47.5.339

Joo Young Lee, Se Jin Han. JKAOMS 2021;47:249-56. https://doi.org/10.5125/jkaoms.2021.47.4.249