Dataset Information

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

ABSTRACT: BACKGROUND:To investigate the area and morphological changes around the soft tissue chin after orthodontic incisor retraction. METHODS:Fifty-nine female adults with bimaxillary protrusion requiring extraction of four premolars were included in the study. 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. RESULTS:Following the incisor retractions (5.35?±?1.79?mm and 4.42?±?1.62?mm for the upper and lower, respectively), there was a significant increase in the soft tissue thickness of L1c-LL (0.64?±?1.67?mm, P?=?0.025) and Pog-Pog' (0.44?±?1.10?mm, P?=?0.022), and a significant decrease in the soft tissue thickness of B-B' (1.21?±?1.34?mm, P??0.05). Pearson coefficient between the thickness changes of B-B' and the retraction of lower incisors was -?0.376. The multiple correlations between the soft tissue thickness changes and incisor retractions were Y?=?1.02-0.42a?+?0.42b for L1c-LL, and Y?=?0.17-0.31b for B-B'. CONCLUSIONS:The orthodontic incisor retraction could cause soft tissue thickness changes (i.e. an increase in L1c-LL and Pog-Pog' and a decrease in B-B') without area changes.

SUBMITTER: Lu W

PROVIDER: S-EPMC7160892 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

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

Lu Wenxin W Zhang Xu X Mei Li L Wang Pengfei P He Jiarong J Li Yu Y Zhao Zhihe Z

BMC oral health 20200415 1

<h4>Background</h4>To investigate the area and morphological changes around the soft tissue chin after orthodontic incisor retraction.<h4>Methods</h4>Fifty-nine female adults with bimaxillary protrusion requiring extraction of four premolars were included in the study. 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 corr ...[more]

PMID: 32295586

Similar Datasets

Project description:BackgroundSome female adults who received orthodontic treatment often complain about thinner faces, protruding cheekbones and sunken temples, even at the beginning of treatment. The present research aimed to explore facial soft tissue changes during and after orthodontic treatment, as well as the related factors affecting facial soft tissue changes.MethodsThis study used 3dMD stereo photography technology to compare facial soft tissue changes among adult females who received orthodontics. A total of 52 adult females (24 teeth extraction, 28 non-teeth extraction cases) were included and potential correlations between related factors (facial morphology features, the change of occlusal height and dental arch width) were evaluated during different treatment periods.ResultsOverall, 3D-negative soft tissue changes of the buccal region moderately correlated with distances of nasion-menton and subnasale-menton (both rs = 0.30, P < 0.05) as well as the ratio of subnasale-menton/right gonion-left gonion (rs = 0.33, P < 0.05) and nasion-menton/right zygomatic point-left zygomatic point (rs = 0.30, P < 0.05). Among the 3D angle measurements, the right chelion-median upper lip point-left chelion angle was found to have a moderate correlation with 3D negative changes of the upper cheilion region (rs = 0.31, P < 0.01). Analysis of occlusal height changes revealed that an increase in the posterior facial height (nasion-gonial distance) may be a risk factor for negative changes in the zygomatic arch area. In addition, a moderate positive correlation between the maxillary first molar width changes and 3D-negative changes of the lower cheek region was found (rs = 0.41, P < 0.05).ConclusionsAfter orthodontic treatment, adult females with wide and short faces may be prone to negative soft tissue changes. Changes of posterior facial height and arch width between the first molars were also risk factors for negative changes of facial soft tissues. Extraction is not a major factor producing facial soft tissue changes.

Dataset Information

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

Publications

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

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets