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Two reproducible facial expressions (maximum smile, lip purse) were captured at T0 and T1 by videostereophotogrammetry as 4D face scan. The magnitude, shape change, symmetry, and time of the facial movements were analysed. The motion changes were analysed in dependence of skeletal class and surgical movements.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>4D motion capture analysis was feasible in all cases. The magnitude of the expression maximum smile increased from 15.24 to 17.27\u00a0mm (<jats:italic>p<\/jats:italic>\u2009=\u20090.002), while that of the expression lip purse decreased from 9.34 to 8.31\u00a0mm (<jats:italic>p<\/jats:italic>\u2009=\u20090.01). Shape change, symmetry, and time of the facial movements did not differ significantly pre- and postsurgical. The changes in facial movements following orthodontic-surgical treatment were observed independently of skeletal class and surgical movements.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Orthodontic-surgical treatment not only affects static soft tissue but also soft tissue dynamics while smiling or lip pursing.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Clinical relevance<\/jats:title>\n                <jats:p>To achieve comprehensive orthodontic treatment plans, the integration of facial dynamics via videostereophotogrammetry provides a promising approach in diagnostics.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Trial registration number<\/jats:title>\n                <jats:p>DRKS00017206.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00784-023-05195-9","type":"journal-article","created":{"date-parts":[[2023,8,10]],"date-time":"2023-08-10T15:02:32Z","timestamp":1691679752000},"page":"5841-5851","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["The impact of orthodontic-surgical treatment on facial expressions\u2014a four-dimensional clinical trial"],"prefix":"10.1007","volume":"27","author":[{"given":"Anja","family":"Quast","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monika","family":"Sadlonova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Asendorf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlotta","family":"Derad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00e9r\u00e9my","family":"Mouchoux","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Horn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henning","family":"Schliephake","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Kauffmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Meyer-Marcotty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,8,10]]},"reference":[{"key":"5195_CR1","doi-asserted-by":"publisher","first-page":"384","DOI":"10.1037\/0003-066X.48.4.384","volume":"48","author":"P Ekman","year":"1993","unstructured":"Ekman P (1993) Facial expression and emotion. 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