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Three-dimensional images from 11 patients (9 women, 2 men; mean age 33.5 years) were analyzed with Vectra M3 software for linear measurements, distances from lip surfaces, and areas. From T0 to T1, lower lip height, surface, and area decreased significantly, while upper lip area increased; measurements were stable from T1 to T2. Patient age correlated strongly with several lower-lip and width variables, especially at T2, supporting stereophotogrammetry as an effective method for assessing soft-tissue change.",{"@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/assessment-of-lip-morphology-changes-after-bimaxillary-orthognathic-surgery-using-stereophotogrammetry/461691/",{"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/assessment-of-lip-morphology-changes-after-bimaxillary-orthognathic-surgery-using-stereophotogrammetry/461691.png","ImageObject",300,407,{"name":92,"@type":93},"ahduag","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-09-30",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 study's primary aim?","Question",{"text":113,"@type":114},"To quantitatively evaluate changes in upper and lower lip morphology after bimaxillary orthognathic surgery using stereophotogrammetry.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Which time points were used for the lip assessments?",{"text":118,"@type":114},"Assessments were performed at preoperative baseline (T0), 6 months postoperatively (T1), and 1 year postoperatively (T2).",{"name":120,"@type":111,"acceptedAnswer":121},"What stereophotogrammetry analysis tools and measurements were used?",{"text":122,"@type":114},"3D images were analyzed with Vectra M3 to calculate linear measurements, distances from lip surfaces, and lip areas.","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},461691,1791090582,{"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},3985747870414,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Brazilian Dental Journal. Volume 36 (2025), e25-6543 [http://dx.doi.org/10.1590/0103-644020256543](http://dx.doi.org/10.1590/0103-644020256543)  \nISSN 0103-6440   \nAssessment of lip morphology changes after bimaxillary orthognathic surgery using stereophotogrammetry  \nJuliana Rodrigues Rozatto1, Lucas Moura Sousa1, Ana Maria Bettoni Rodrigues2, Marco Antonio M. Rodrigues da Silva2, Alexandre Elias Trivellato1, Cássio Edvard Sverzut1.  \nThis study aimed to evaluate changes in upper and lower lip morphology after bimaxillary orthognathic surgery using stereophotogrammetry at the preoperative (T0) and postoperative periods of 6 months (T1) and 1 year (T2) . For this purpose, 3D images of 11 patients (9 women and 2 men), with an average age of 33.5 years, who underwent surgery in hospitals associated with the Residency Training Program, School of Dentistry of Ribeirão Preto, University of São Paulo, from 2013 to 2019, were analyzed. The software Vectra M3 was used to calculate linear measurements, distance from lip surfaces, and areas. A significant decrease in the lower lip height (p = 0 .0621), surface (p = 0.0435), and area (p = 0.0042), as well as an increase in upper lip area (p = 0.029), were observed from T0 to T1 . All measurements remained stable from T1 to T2 . Additionally, the ages of patients were correlated with the variables at T0, T1, and T2, and the data showed a strong correlation with height and distance of the lower lip vermilion, as well as lip width, particularly at T2 . In conclusion, stereophotogrammetry proved to be a valuable tool for assessing soft tissue changes, revealing a significant increase in upper lip area and a decrease in lower lip area, as well as height, and distance from its surface.  \n1 Department of Oral & Maxillofacial Surgery, and Periodontology, University of São Paulo (USP), Ribeirão Preto School of Dentistry (FORP), Ribeirão Preto, SP, Brazil.  \n2 Department of Restorative Dentistry, University of São Paulo (USP), Ribeirão Preto School of Dentistry (FORP), Ribeirão Preto, SP, Brazil.  \nCorrespondence: Cássio Edvard Sverzut (e-mail: Department of Oral & Maxillofacial Surgery, and Periodontology, University of São Paulo (USP), Ribeirão Preto School of Dentistry (FORP), Ribeirão Preto, SP, Brazil. Phone number: +55163315-3980/ +55163315-4135 .  \n[Email: cesve@forp.usp.br](Email: cesve@forp.usp.br)  \nKey Words: Stereophotogrammetry, Three-dimensional image, Orthognathic surgery, Lip measurements.  \nIntroduction  \nOrthognathic surgery aims to improve the stomatognathic system function and facial symmetry and harmony (1,2) . Appearance is a primary concern for most people seeking this surgical treatment, and the lips are essential components of facial aesthetics. The three-dimensional repositioning of bones during orthognathic surgery can lead to varying degrees of significant changes in the patient's face, such as alterations to the nose, lips, zygomatic regions, and submandibular area. However, predicting the effect of orthognathic surgery on the soft tissue profile is not straightforward (1,3) .  \nIn recent years, technology has provided new noninvasive tools for facial morphology analysis, with stereophotogrammetry standing out as a method with proven accuracy and repeatability (4-6). This technology enables fast, accurate, and safe three-dimensional imaging of soft tissue while also providing additional information such as surface color and texture. Consequently, it is possible to obtain a better surface image with higher resolution and, therefore, improved quality (4,7,8) .  \nDue to the importance of lip symmetry and projection on facial appearance, it is crucial to assess changes in lip morphology prior to orthognathic surgery accurately. This helps optimize surgical planning and facilitates communication between the surgeon and patient, which is essential for achieving a satisfactory final result (7,9,10) . Therefore, the aim of the present study was to quantitatively evaluate upper","cbCainRlf1acLAPT","https://ap.wps.com/l/cbCainRlf1acLAPT","pdf",677521,"English","# Introduction\n# Materials and methods","[{\"question\":\"What was the study's primary aim?\",\"answer\":\"To quantitatively evaluate changes in upper and lower lip morphology after bimaxillary orthognathic surgery using stereophotogrammetry.\"},{\"question\":\"Which time points were used for the lip assessments?\",\"answer\":\"Assessments were performed at preoperative baseline (T0), 6 months postoperatively (T1), and 1 year postoperatively (T2).\"},{\"question\":\"What stereophotogrammetry analysis tools and measurements were used?\",\"answer\":\"3D images were analyzed with Vectra M3 to calculate linear measurements, distances from lip surfaces, and lip areas.\"}]","Assessment of lip morphology changes after bimaxillary orthognathic surgery using stereophotogrammetry | PDF",1790762169,25]