[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-432694-105":59,"doc-detail-432694-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","long-term-upper-airway-changes-following-mandibular-advancement-with-or-without-maxillary-setback-in-skeletal-class-ii-patients-a-2-year-retrospective-study","Long-term upper airway changes following mandibular advancement with or without maxillary setback in skeletal class II patients - a 2-year retrospective study","","Long-term oropharyngeal airway changes were evaluated in skeletal Class II patients after surgery with isolated mandibular advancement via bilateral sagittal split osteotomy (BSSO), with or without concurrent maxillary setback using Le Fort Iosteotomy. Cone-beam CT data were retrospectively analyzed across preoperative baseline (T0), 3 months (T1), and 2 years (T2), quantifying total upper airway volume and regional airway components. Isolated BSSO produced sustained expansion driven mainly by hard tissue advancements and showed stronger short- and long-term outcomes than BSSO plus Le Fort I.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/long-term-upper-airway-changes-following-mandibular-advancement-with-or-without-maxillary-setback-in-skeletal-class-ii-patients-a-2-year-retrospective-study/432694/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/long-term-upper-airway-changes-following-mandibular-advancement-with-or-without-maxillary-setback-in-skeletal-class-ii-patients-a-2-year-retrospective-study/432694.png","ImageObject",300,407,{"name":92,"@type":93},"Well Done","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",11,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What was the main objective of the study?","Question",{"text":113,"@type":114},"To assess two-year oropharyngeal airway changes in skeletal Class II patients after isolated mandibular advancement, with or without maxillary setback.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How were airway changes measured, and at which time points?",{"text":118,"@type":114},"Cone-beam CT (CBCT) was analyzed at T0 (preoperatively), T1 (3 months), and T2 (2 years), measuring total airway volume, minimum cross-sectional area, and regional airway volumes via Dolphin Imaging.",{"name":120,"@type":111,"acceptedAnswer":121},"What were the key findings comparing isolated BSSO with BSSO + Le Fort I?",{"text":122,"@type":114},"Isolated BSSO produced greater short-term improvements and better long-term stability in total airway volume and nasopharynx volume.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},432694,1791051924,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":52,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},5909892210082,"https://ap-avatar.wpscdn.com/avatar/56001069da27c9f41e8?x-image-process=image/resize,m_fixed,w_180,h_180&k=1789614185077863061","Tang et al. BMCOral Health (2026) 26:4 BMC Oral Health  \n[https://doi.org/10.1186/s12903-025-07462-5](https://doi.org/10.1186/s12903-025-07462-5)  \nRESEARCH Open Access  \nLong-term upper airway changes following mandibular advancement with or without maxillary setback in skeletal class II patients: a 2-year retrospective study  \nHong-Yi Tang1†, Zi-Rui Zhou 1†, Jiang-Feng Fu1, Qian-Wen Li 1, Li Gao2* and Jiu-Hui Jiang1*  \nAbstract  \nObjective This study assessed 2-year oropharyngeal airway changes in skeletal Class II patients following isolated mandibular advancement by bilateral sagittal split osteotomy (BSSO) with or without maxillary setback by Le Fort Iosteotomy (Le fort I) .  \nMaterials and methods Cone-beam computed tomography (CBCT) data from 25 isolated BSSO and 57 BSSO + Le fort I patients were retrospectively analyzed at three stages: preoperatively (T0), 3 months (T1), and 2 years postoperatively (T2). The total upper airway volume (V), minimum cross-sectional area (CSAmin), and volumes ofthe nasopharynx (VNA), velopharynx (VVE), and glossopharynx (VGL) were measured via Dolphin Imaging.  \nResults Isolated BSSO significantly increased V, CSAmin, VNA, VVE, and VGL by 38.86%, 69.49%, 22.31%, 46.05%, and 46. 94%, respectively, at T1 (P \u003C 0. 01) and 21. 85%, 43 . 11%, 13. 85%, 19. 73%, and 25. 38%, respectively, at T2 (P \u003C 0. 05) . From T1 toT2, V, CSAmin, VVE, and VGL decreased by 12.24%, 15.56%, 18.02%, and 14.67%, respectively (P \u003C 0.05) . Multivariate regression revealed that each 1 mm advancement of the PNS and B points increased V by 1038 mm³ and VVE by 519 mm³; PNS advancement increased VNA by 708 mm³ (P \u003C 0. 05) . Compared with BSSO + Le fort I, isolated BSSO yielded greater short-term improvements (V: +11175 vs. +3638 mm³; P \u003C 0. 001) and superior long-term stability in V and VNA (P \u003C 0.05) . Notably, the combined advancement of PNS and B point may be a robust predictor for postoperative changes of the upper airway volume.  \nConclusion Isolated BSSO induces sustained upper airway expansion for 2 years, which is driven primarily by hard tissue advancements. Compared with BSSO + Le fort I, this technique has superior short-and long-term efficacy, providing guidance for the optimized management of skeletal Class II patients.  \n†Hong-Yi Tang and Zi-Rui Zhou contributed equally to this work.  \n*Correspondence: Li Gao [gaolily1979@163.com](gaolily1979@163.com)[ ](gaolily1979@163.com)Jiu-Hui Jiang [drjiangw@163.com](drjiangw@163.com)  \nFull list of author information is available at the end of the article  \n© The Author(s) 2025. Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit [http://creati](http://creati)[vecommons.org/licenses/by-nc-nd/4.0/](vecommons.org/licenses/by-nc-nd/4.0/.)[.](vecommons.org/licenses/by-nc-nd/4.0/.)  \nTang et al. BMC Oral Health (2026) 26:4 Page 2 of 10  \nEthics approval This study was approved by the Ethics Committee of Peking University Stomatological Hospital (Approval No. PKUSSIRB-202167121) .  \nKeywords Skeletal class II, Oropharyngeal airway, Isolated mandibular advancement, Maxilla","cbCaiathKI4FTdHQ","https://ap.wps.com/l/cbCaiathKI4FTdHQ","pdf",1766947,"English","# Abstract\n## Objective\n## Materials and methods\n## Results\n## Conclusion\n# Introduction\n# Materials and methods\n## Study design and patients","[{\"question\":\"What was the main objective of the study?\",\"answer\":\"To assess two-year oropharyngeal airway changes in skeletal Class II patients after isolated mandibular advancement, with or without maxillary setback.\"},{\"question\":\"How were airway changes measured, and at which time points?\",\"answer\":\"Cone-beam CT (CBCT) was analyzed at T0 (preoperatively), T1 (3 months), and T2 (2 years), measuring total airway volume, minimum cross-sectional area, and regional airway volumes via Dolphin Imaging.\"},{\"question\":\"What were the key findings comparing isolated BSSO with BSSO + Le Fort I?\",\"answer\":\"Isolated BSSO produced greater short-term improvements and better long-term stability in total airway volume and nasopharynx volume.\"}]","Long-term upper airway changes following mandibular advancement with or without maxillary setback in skeletal class II patients - a 2-year retrospective study | PDF",1790660892,25]