Evaluation of soft tissue changes around the lips after bracket debonding using three-dimensional stereophotogrammetry

Kim, Young-Kyun; Lee, Nam-Ki; Moon, Sang-Woon; Jang, Moon-Jung; Kim, Hyunsuk; Yun, Pil‐Young

doi:10.2319/090414.622.1

Cited by 15 publications

(28 citation statements)

References 19 publications

(43 reference statements)

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“…Based on some previous quantitative studies, the changes in the perioral soft tissues after appliance removal are not clinically significant, but individual variations do exist. Thus, the effect of orthodontic brackets removal on lip positions was not considered relevant in this study [ 47 – 48 ].…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional region-based study on the relationship between soft and hard tissue changes after orthognathic surgery in patients with prognathism

Weng

et al. 2018

PLoS ONE

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Both deep understanding and reliable prediction of postoperative soft tissue changes are crucial for planning orthognathic surgery. Instead of estimating soft tissue responses by measuring individual landmark changes, this study aimed to investigate the relationship (ratio) between soft and hard tissue movements in different facial regions through three-dimensional cone-beam computed tomography (CBCT). Preoperative and postoperative CBCT images were superimposed using the surface registration method on the basis of the cranial base, and 10 facial regions of interest were defined. Region-based volumetric subtractions between the preoperative and postoperative segments were performed. The volumetric differences and surface of each region were used to estimate the average movement. Correlation and regression analyses were performed to examine the relationships between the corresponding soft and hard tissue movements. An overall pattern of facial soft tissue movement was observed in patients with prognathism who underwent orthognathic surgery. The experiment results have shown that mean ratios for the average soft-to-hard tissue movements in the facial regions varied, which may not exactly be similar to the published reports because of the population biocharacteristics and study methods, but the trend is in agreement with the previous studies. Additionally, the prediction capability of the regression model was significantly high, ranging from 0.786 to 0.857, in upper lip, upper vermilion, and chin regions, thus demonstrating that the skin outline changes in these critical regions could be reliably predicted from the underlying bone movements. These results could likely be applied in future soft tissue simulation in orthognathic surgery.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional region-based study on the relationship between soft and hard tissue changes after orthognathic surgery in patients with prognathism

Weng

et al. 2018

PLoS ONE

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“…In determining the 3D coordinate system settings, 17 left and right pupil points are connected by a segment that defines the x (left-right)-axis. The YZ plane perpendicularly bisects the x-axis.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional assessment of nasal changes after maxillary advancement with impaction using stereophotogrammetry

et al. 2020

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Three-dimensional assessment of nasal changes after maxillary advancement with impaction using stereophotogrammetry Objective: To evaluate the changes in the nose in three dimensions after Le Fort I osteotomy in patients with skeletal Class III malocclusion. Methods: The subjects were 40 adult patients (20 females and 20 males; mean age, 20.3 ± 3.0 years; range, 17.0 to 31.1 years) who underwent one-piece Le Fort I osteotomy with maxillary advancement and impaction treatment for maxillary hypoplasia. The mean maxillary advancement was 4.56 ± 1.34 mm, and the mean maxillary impaction was 2.03 ± 1.04 mm. Stereophotogrammetry was used to acquire three-dimensional images before and at least 6 months after surgery. Results: Alare (Al) and alare curvature (Ac) points had moved vertically and anterolaterally postoperatively. A significant increase was observed in the nasal ala width and alar base width, and no changes were noted in the columellar length, nasolabial angle, and nasal area. There was a significant relationship between maxillary impaction and nasal ala width and horizontal and sagittal positions of the bilateral Al and Ac. The only relationship found was between maxillary advancement and postoperative sagittal location of the subnasale and pronasale. Conclusions: Nasal soft tissues were highly affected by the vertical movement of the maxilla; however, the soft tissue responses were individual-dependent.

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“…Kim et al20 reported no significant differences in the position of any landmark between 2 repeated digitizations. Several studies have developed 3D facial analyses based on 3D photogrammetric data 2021. Nevertheless, volumetric or curve variables were not incorporated into these 3D facial analyses.…”

Section: Introductionmentioning

confidence: 97%

A three-dimensional photogrammetric analysis of the facial esthetics of the Miss Korea pageant contestants

et al. 2017

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ObjectiveThe aims of this study were to measure and compare the facial dimensions of the Miss Korea pageant contestants and a selected group of women from the general population by using three-dimensional (3D) image analysis, as well as to compare various facial ratios to the golden ratio within each group.MethodsThree-dimensional images of 52 Miss Korea pageant contestants (MK group) and 41 young female adults selected from the general population (GP group) were acquired. Fifty-four variables and ratios were measured and calculated. Intergroup comparisons were performed using multivariate analysis of variance.ResultsCompared to the GP group, the MK group showed greater total facial height and eye width, lesser lower-facial height, and lesser facial, lower-facial, and nasal widths. Moreover, compared to the GP group, the MK group had more protruded noses with greater nasolabial angle, greater vertical curvature of the foreheads, lesser horizontal curvature of the cheek, and lesser lower-lip-and-chin volume.ConclusionsThe MK group had longer faces but smaller lower lips and chins than did the GP group. The golden ratio was not matching the current facial esthetic standards. These data might be beneficial for treatment planning of patients undergoing orthognathic and plastic surgeries.

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Evaluation of soft tissue changes around the lips after bracket debonding using three-dimensional stereophotogrammetry

Abstract: There was a slight retrusion in the oral commissure and lower lip areas after debonding, but no changes were found in the upper lip area. This study showed that 3-D stereophotogrammetry can be useful in evaluating facial soft tissue changes in orthodontic patients.

Cited by 15 publications

References 19 publications

Three-dimensional region-based study on the relationship between soft and hard tissue changes after orthognathic surgery in patients with prognathism

Three-dimensional region-based study on the relationship between soft and hard tissue changes after orthognathic surgery in patients with prognathism

Three-dimensional assessment of nasal changes after maxillary advancement with impaction using stereophotogrammetry

A three-dimensional photogrammetric analysis of the facial esthetics of the Miss Korea pageant contestants

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