锥束CT三维重建技术在评估上颌窦底提升高度与提升容积关系的应用

目的:探讨患者上颌窦底提升高度(AH)的不同所对应的容积变化规律，为临床评估上颌窦外提升所需骨移植材料的容积提供参考。方法:回顾性研究。纳入2018年10月—2020年4月蚌埠医学院第二附属医院口腔科50例上颌后牙缺失患者的锥束CT(CBCT)影像资料，其中男24例、女26例，年龄40～78(58.3±12.3)岁。利...

Application of 3D digital reconstruction technology of cone-beam CT in evaluating the relationship between the augmentation height and the sinus floor augmentation volume

Objective This study aimed to explore the law of changes in the corresponding volume according to the augmentation height (AH) of the maxillary sinus floor in patients and to provide a reference for the volume of bone transplantation material required for clinical maxillary sinus elevation.Methods Retrospective analysis was applied. The imaging data of cone-beam computed tomography (CBCT) of 50 patients with maxillary posterior tooth loss at the Department of Stomatology of the Second Affiliated Hospital of Bengbu Medical College from October 2018 to April 2020 were retrospectively analyzed. Among these patients, 24 were males and 26 were females, and their age ranged from 40 years to 78 years (58.3 years±12.3 years). Mimics 21.0 was used to reconstruct a three-dimensional model of the maxillary sinus, and 3matic 9.0 was utilized to cut and obtain the corresponding volume according to the different heights of the maxillary sinus floor. The volume corresponding to a certain height (4-12 mm) of the maxillary sinus floor (4-12 mm) was observed, and the volume corresponding to each height was compared bilaterally and between males and females. Pearson's method was applied to analyze the correlation between the elevation of the maxillary sinus floor and the change in volume. A multiple linear regression model was established to predict the theoretical equation of the lifting volume and height of the maxillary sinus floor.Results When the augmentation height of the maxillary sinus floor was from 4 mm to 12 mm (interval of approximately 1 mm), the corresponding elevation volumes of the maxillary sinus were (0.41±0.12), (0.62±0.17), (0.85±0.23), (1.13±0.31), (1.43±0.38), (1.76±0.46), (2.11±0.55), (2.11±0.55), (2.88±0.77) cm³. No significant differences were observed between the left sides and right sides, and the volumes of each lifting height between the males and females (all P values＞0.05). The augmentation height was positively correlated with the elevation volume of the maxillary sinus (r=0.866, P＜0.01). The gender, side-by-side, and augmentation height were included in the multiple linear regression model to predict the theoretical equation of the augmentation height and elevation volume of the maxillary sinus: elevation volume (cm³)=0.31×augmentation height (mm) -0.96. Regression variance analysis revealed that the model was statistically significant (R²=0.750, F=669.258, P＜0.01).Conclusions CBCT can be applied to quickly obtain a three-dimensional model of the maxillary sinus and accurately predict the elevation volume of the maxillary sinus according to the augmentation height. This study can provide a reference for the volume of bone transplantation materials required before clinical implantation.