Risk Factors Affecting Sinus Membrane Thickness and Sinus Membrane Perforation for Lateral Sinus Augmentation on CBCT Analysis

• Published in: Journal of Japanese Society of Oral Implantology Vol. 33; no. 4; pp. 342 - 350
• Main Authors: YAMAGUCHI, Kikue, SHIMOO, Yoshiaki, SATO, Daisuke, ISHIURA, Yuichi, MUNAKATA, Motohiro
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society of Oral Implantology 31.12.2020; 公益社団法人 日本口腔インプラント学会
• Subjects: PNR angle; PNR角; residual bone height; sinus augmentation; sinus membrane perforation; sinus membrane thickness; 上顎洞底挙上術; 既存骨量; 洞粘膜厚; 洞粘膜穿孔
• ISSN: 0914-6695; 2187-9117
• DOI: 10.11237/jsoi.33.342

Introduction : Although lateral sinus augmentation has been established as a highly predictable treatment method, there have been many reports of perforation of sinus mucosa during surgery and postoperative inflammation and onset sinusitis due to infection. In this study, we investigated the sinus mucosal thickness, which affects the indication for maxillary sinus elevation, intraoperative sinus membrane perforation, and sinus membrane perforation risk factors, which are frequent intraoperative complications, with cone beam computed tomography (CBCT).Subjects and Methods : This retrospective clinical study included patients who underwent sinus augmentation with the lateral approach to the maxillary molar region between 2018 and 2020. We examined the relationship between sinus membrane thickness and age, smoking, nasal septum curvature, sex, healing period after tooth extraction, causes of tooth extraction, and residual bone height ; and the relationship between sinus membrane perforation and preoperative sinus mucosa thickness, smoking, sex, defect type, healing period after tooth extraction, and PNR angle.Results : There were 31 patients (10 males and 21 females), 36 sinuses, and the average age was 59.2 years. The average residual bone height was 2.12 ± 1.03 mm. The mean sinus membrane thickness was 1.00 ± 1.23 mm, and the sinus mucosa thickness ＞ 2 mm ratio was 22.2%. As risk factors for increased sinus membrane thickness, males and period after tooth extraction ＜ 1 year were involved. As risk factors for sinus membrane perforation, residual bone height ＜ 1.5 mm, post-extraction period ＜ 6 months, and PNR angle ＜ 90° were involved.Conclusion : When performing lateral sinus augmentation, it is necessary to pay attention to gender, period after tooth extraction, residual bone height, and PNR angle.