Abstract:

Objective: To explore the imaging features and clinical significance of the white blocking line appearing on the newly formed maxillary sinus floor surface after lateral maxillary sinus floor elevation.Methods: A total of 41 patients who had lateral maxillary sinus floor elevation and bone grafting were followed up for 8 to 64 months. Cone beam CT (CBCT) was used to observe the changes in the bone grafts. Systemic information (such as smoking, diabetes) and local conditions (such as sinus membrane thickening or maxillary sinus cyst) were recorded.Results: A total of 45 sinuses in 41 patients had lateral maxillary sinus floor elevation and received bone grafting. Among them, 6 sinuses in 6 patients (with an incidence rate of 13.3%) showed the imaging changes of the white blocking line on the newly formed maxillary sinus floor surface (this radiographic feature is hereinafter referred to as the "analogous bony white line", and the formed structure is hereinafter referred to as the "cortical-like structure"). The formation time of the cortical-like structure is 10 to 36 months after the operation. In 2 patients, the formation of the cortical-like structure was detected 10 months after the operation, and the thickening of the cortical-like structure was observed at 26 months and 30 months after the operation respectively.Conclusion: After lateral maxillary sinus floor elevation, in some cases, the cortical-like structure will appear on the newly formed surface of the maxillary sinus floor during the process of osseointegration, with progressive thickening over time.

Key words: lateral maxillary sinus floor elevation, bone graft, analogous bony white line

摘要：

目的： 探讨侧壁开窗上颌窦底提升术后，新形成的上颌窦底表面出现白色阻射线样影的影像学特征及临床意义。方法： 对41例接受了侧壁开窗上颌窦底提升术并植入人工骨移植材料的患者进行8~64个月的随访。利用锥形束CT(cone beam CT，CBCT)观测人工骨移植材料的变化情况，并记录患者的全身情况（如吸烟史、糖尿病史）及术前局部情况（如上颌窦囊肿或上颌窦黏膜增厚）。结果： 41例患者共45侧上颌窦接受了侧壁开窗上颌窦底提升术并植入人工骨移植材料，其中6例患者的6侧上颌窦（发生率为13.3%）在新形成的上颌窦底表面出现了白色阻射线样影的影像学改变（下文称为“类骨白线”，形成的组织结构下文称为“类骨皮质”）。类骨皮质形成的时间为术后10~36个月。有2例患者于术后10个月发现类骨皮质形成，并分别在术后26个月和30个月时发现类骨皮质增厚。结论： 侧壁开窗上颌窦底提升术后，部分病例在骨结合过程中，新形成的上颌窦底表面会出现类骨皮质样结构，且随时间延长有所增厚。

关键词: 侧壁开窗上颌窦底提升术, 人工骨移植材料, 类骨白线

CLC Number: 

• R782