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Cephalograms were taken before (T0) and after (T1) orthodontic treatment. The soft tissue changes, including the area, thickness and morphology were measured. Paired-t tests were performed for statistical comparisons. Pearson correlation analyses and backward multivariate regression analyses were used to identify the relationship between the soft tissue changes and incisor retraction.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Following the incisor retractions (5.35\u2009\u00b1\u20091.79\u2009mm and 4.42\u2009\u00b1\u20091.62\u2009mm for the upper and lower, respectively), there was a significant increase in the soft tissue thickness of L1c-LL (0.64\u2009\u00b1\u20091.67\u2009mm, <jats:italic>P<\/jats:italic>\u2009=\u20090.025) and Pog-Pog\u2019 (0.44\u2009\u00b1\u20091.10\u2009mm, <jats:italic>P<\/jats:italic>\u2009=\u20090.022), and a significant decrease in the soft tissue thickness of B-B\u2032 (1.21\u2009\u00b1\u20091.34\u2009mm, <jats:italic>P<\/jats:italic>\u2009&lt;\u2009\u00a00.01). Changes in the area of soft tissue chin and lower lip were not statistically significant (<jats:italic>P<\/jats:italic>\u2009&gt;\u20090.05). Pearson coefficient between the thickness changes of B-B\u2032 and the retraction of lower incisors was \u2212\u20090.376. The multiple correlations between the soft tissue thickness changes and incisor retractions were <jats:italic>Y\u2009=\u20091.02\u20130.42a\u2009+\u20090.42b<\/jats:italic> for L1c-LL, and <jats:italic>Y\u2009=\u20090.17\u20130.31b<\/jats:italic> for B-B\u2032.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>The orthodontic incisor retraction could cause soft tissue thickness changes (i.e. an increase in L1c-LL and Pog-Pog\u2019 and a decrease in B-B\u2032) without area changes.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12903-020-01099-2","type":"journal-article","created":{"date-parts":[[2020,4,15]],"date-time":"2020-04-15T17:02:39Z","timestamp":1586970159000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study"],"prefix":"10.1186","volume":"20","author":[{"given":"Wenxin","family":"Lu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Mei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengfei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiarong","family":"He","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihe","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,4,15]]},"reference":[{"key":"1099_CR1","first-page":"204","volume":"76","author":"S Matoula","year":"2006","unstructured":"Matoula S, Pancherz H. 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