[Personalized mandibular reconstruction assisted by three-dimensional retrieval model based on fully connected neural network and a database of mandibles].

Q3 Medicine
北京大学学报(医学版) Pub Date : 2025-04-18
Shiyu Qiu, Yang Lian, Yifan Kang, Lei Zhang, Yiwang Cai, Xiaofeng Shan, Zhigang Cai
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引用次数: 0

Abstract

Objective: To propose a new protocol for personalized mandibular reconstruction assisted by three-dimensional (3D) retrieval model based on fully connected neural network (FCNN) and a database of mandibles, and to verify clinical feasibility of the protocol.

Methods: A database of mandibles of 300 normal northern Chinese Han people was established. On the basis of cephalometry, the mandible landmarks with good stability were further screened. Mandibular landmarks were selected and geometric features of the mandible were extracted. A 3D retrieval algorithm was developed, which could retrieve the mandible most similar to a given mandible from the database. A FCNN was built to train the algorithm to improve accuracy of the 3D retrieval model. Using Geomagic Control 2014 software, matching accuracy of the 3D retrieval model was based on aforementioned mandible database and algorithm. From December 2019 to March 2021, a total of 5 patients underwent personalized mandibular reconstruction assisted by a 3D retrieval model based on mandible database and FCNN in the Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology. The most similar mandible was retrieved from mandible database through 3D retrieval algorithm. It was used to restore the premorbid morphology of defect area and guide mandibular reconstruction. For the 5 patients, mandible was reconstructed with iliac flap. Virtual surgical plan was transformed using individual surgical guides.

Results: Through screening, mandibular landmarks with high reproducibility and stability were identified and composed of mandibular landmarker protocols. After training, the average deviation between most similar mandible retrieved from the 300-case mandible database through 3D retrieval model based on FCNN and given mandible was (1.77±0.44) mm. And the root-mean-square deviation between the most similar mandible retrieved from the database and given mandible was (2.58±0.86) mm. The mandibular reconstruction surgery was successful in all the 5 patients. Their facial symmetry and occlusion were restored. All the patients were satisfied with postoperative appearance. The mean deviation between postoperative mandible and preoperative design was (0.98±0.17) mm. The area with a deviation ≤1 mm accounted for 61.34%±14. 13%, ≤2 mm accounted for 83.82%±7.35%, and ≤3 mm accounted for 93.94%± 2.87%.

Conclusion: The personalized mandibular reconstruction assisted by 3D retrieval model based on the 300-case mandible database and FCNN is feasible clinically.

[基于全连接神经网络和下颌骨数据库的三维检索模型辅助个性化下颌骨重建]。
目的:提出一种基于全连接神经网络(FCNN)和下颌骨数据库的三维检索模型辅助下颌骨个性化重建的新方案,并验证该方案的临床可行性。方法:建立300例中国北方汉族正常人群下颌骨数据库。在头颅测量的基础上,进一步筛选稳定性较好的下颌骨标志。选取下颌标志,提取下颌几何特征。提出了一种三维检索算法,可以从数据库中检索出与给定下颌骨最相似的下颌骨。通过构建FCNN对算法进行训练,提高了三维检索模型的精度。利用Geomagic Control 2014软件,基于上述下颌骨数据库和算法对三维检索模型进行匹配精度。2019年12月至2021年3月,5例患者在北京大学口腔医学院口腔颌面外科进行了基于下颌数据库和FCNN的三维检索模型辅助下的个性化下颌重建。通过三维检索算法从颌骨数据库中检索出最相似的下颌骨。用于修复病前缺损区形态,指导下颌骨重建。5例采用髂骨瓣重建下颌骨。虚拟手术计划转化为个体手术指南。结果:通过筛选,鉴定出重复性高、稳定性好的下颌标志,并组成下颌标志方案。训练后,基于FCNN的三维检索模型从300例下颌骨数据库中检索到的最相似下颌骨与给定下颌骨的平均偏差为(1.77±0.44)mm,数据库中检索到的最相似下颌骨与给定下颌骨的均方根偏差为(2.58±0.86)mm, 5例患者均成功进行下颌重建手术。面部对称性和咬合恢复。所有患者术后外观均满意。术后下颌骨与术前设计的平均偏差为(0.98±0.17)mm,偏差≤1 mm的面积占61.34%±14。13%,≤2mm占83.82%±7.35%,≤3mm占93.94%±2.87%。结论:基于300例下颌骨数据库和FCNN的三维检索模型辅助下颌骨个性化重建在临床上是可行的。
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来源期刊
北京大学学报(医学版)
北京大学学报(医学版) Medicine-Medicine (all)
CiteScore
0.80
自引率
0.00%
发文量
9815
期刊介绍: Beijing Da Xue Xue Bao Yi Xue Ban / Journal of Peking University (Health Sciences), established in 1959, is a national academic journal sponsored by Peking University, and its former name is Journal of Beijing Medical University. The coverage of the Journal includes basic medical sciences, clinical medicine, oral medicine, surgery, public health and epidemiology, pharmacology and pharmacy. Over the last few years, the Journal has published articles and reports covering major topics in the different special issues (e.g. research on disease genome, theory of drug withdrawal, mechanism and prevention of cardiovascular and cerebrovascular diseases, stomatology, orthopaedic, public health, urology and reproductive medicine). All the topics involve latest advances in medical sciences, hot topics in specific specialties, and prevention and treatment of major diseases. The Journal has been indexed and abstracted by PubMed Central (PMC), MEDLINE/PubMed, EBSCO, Embase, Scopus, Chemical Abstracts (CA), Western Pacific Region Index Medicus (WPR), JSTChina, and almost all the Chinese sciences and technical index systems, including Chinese Science and Technology Paper Citation Database (CSTPCD), Chinese Science Citation Database (CSCD), China BioMedical Bibliographic Database (CBM), CMCI, Chinese Biological Abstracts, China National Academic Magazine Data-Base (CNKI), Wanfang Data (ChinaInfo), etc.
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