Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study

• DOI: 10.1186/s12903-020-01099-2
• Publication Date: 2020-04-15T17:02:39Z
• Authors: Wenxin Lu; Xu Zhang; Li Mei; Pengfei Wang; Jiarong He; Yu Li; Zhihe Zhao
• Keywords: Hard tissue; Cephalometry

To investigate the area and morphological changes around soft tissue chin after orthodontic incisor retraction.Fifty-nine female adults with bimaxillary protrusion requiring extraction of four premolars were included in study. Cephalograms taken before (T0) (T1) treatment. The changes, including area, thickness morphology measured. Paired-t tests performed for statistical comparisons. Pearson correlation analyses backward multivariate regression used to identify relationship between retraction.Following retractions (5.35 ± 1.79 mm 4.42 1.62 upper lower, respectively), there was a significant increase L1c-LL (0.64 1.67 mm, P = 0.025) Pog-Pog' (0.44 1.10 0.022), decrease B-B' (1.21 1.34 < 0.01). Changes lower lip not statistically (P > 0.05). coefficient retraction incisors - 0.376. multiple correlations Y 1.02-0.42a + 0.42b L1c-LL, 0.17-0.31b B-B'.The could cause (i.e. an B-B') without changes.