Changes of lip morphology following mandibular setback surgery using 3D cone-beam computed tomography images

Paek, Seung Jae; Yoo, Ji Yong; Lee, Jang-Won; Park, Won-Jong; Chee, Young Deok; Choi, Moon Gi; Choi, Eun Joo; Kwon, Kang Beom

doi:10.1186/s40902-016-0082-0

Cited by 13 publications

(13 citation statements)

References 23 publications

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“…Seung et al evaluated the lip morphological changes following mandibular setback surgery using 3D cone-beam computed tomography images. Their results revealed that both upper and lower lip areas on frontal-view images were not signi cantly changed, but the upper lip area on the lateral view increased, and the lower lip area decreased 33 , which corresponded to our research ndings that in the frontal view, both A and B areas showed no signi cant changes after surgery.…”

Section: Discussionsupporting

confidence: 87%

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Changes in Smile Parameters Following Surgical-orthodontic Treatment for Skeletal Class III Malocclusion

Cheng

Hsu

Moreira

et al. 2022

Preprint

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PurposeTo analyze differences in smile parameters following surgical-orthodontics in skeletal Class III patients with mandibular prognathism and to identify factors affecting smile parameters after orthognathic surgery.Materials and Methods:These retrospective study comprised of thirty-four patients, diagnosed as having skeletal Class III malocclusion with pure mandible prognathism, were treated with surgical-orthodontics in Taipei Medical University Hospital. Hard and soft tissue variables were measured through lateral cephalometry, and smile esthetics were measured using extraoral photographs. Postoperative changes in smile parameters and differences between sexes were analyzed using the t test. The relationship among smile parameters were analyzed using the Pearson correlation. Random forest methods and decision tree deep learning models were used to identify the variables associated with asymmetry after surgery.Results:Postoperatively, the buccal corridor (p = 0.024), upper lip height (C1) (p = 0.003), and smile index (p = 0.031) were significantly different. The upper midline and right chelion were significantly different between sexes. A very strong positive correlation was observed between the upper lip height and upper lip ratio and between the lower lip height and lower lip ratio; a strong positive correlation was observed between lower teeth exposure and the interlabial gap and between the right chelion and left chelion. By contrast, a strong negative correlation was observed between lower teeth exposure and the smile index and between the smile index and interlabial gap. The following smile parameters associated with asymmetry exhibited the most changes after surgery: lower lip area, interlabial gap, smile index, buccal corridor, and arc ratio.Conclusions:Following orthognathic surgery, marked changes were noted in skeletal, dental, and soft tissue parameters, but smile esthetics changed less from the frontal view. The most changes regarding asymmetry after surgery were noted in the lower lip area, interlabial gap, smile index, buccal corridor, and arc ratio in this order.

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Section: Discussionsupporting

confidence: 87%

“…Moreover, the variables were chosen after a review of various articles on factors affecting smile esthetics. 16,17,24,32 In particular, we measured the lip height ratio, lip asymmetry, and lip area, 33 which crucially affect smile esthetics but are usually neglected in smile analysis.…”

Section: Discussionmentioning

confidence: 99%

Changes in Smile Parameters Following Surgical-orthodontic Treatment for Skeletal Class III Malocclusion

Cheng

Hsu

Moreira

et al. 2022

Preprint

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“…Other authors assessed Ch movement in 2 directions (posteriorly and inferiorly) after isolated mandibular setback surgery. 2,[14][15][16] All these studies demonstrated that mandibular setback surgery caused the Ch to move posteriorly, simultaneous with inferior movement of the upper lip. The circular orbicularis oris muscle may cause this posterior movement of the Ch, along with that of the upper and lower lips.…”

Section: Discussionmentioning

confidence: 97%

Effect of Orthognathic Surgery on Movement of the Cheilion

Sağlam

Yılmaz

Özel

et al. 2022

Journal of Craniofacial Surgery

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The cheilion (Ch), corner of the mouth, is the softtissue landmark where the upper and lower lips intersect. Orthognathic surgery can modify Ch position, which can affect facial esthetics. The aims were to evaluate Ch movements resulting from Le Fort I maxillary advancement with maxillary impaction or downgrafting, and with mandibular advancement or setback, and to investigate relationships between surgical movements and Ch movements. The 45 patients had undergone bilateral sagittal split ramus osteotomy with Le Fort I advancement surgery. They were divided into 4 groups according to surgical movement direction. Preoperative and postoperative photographs were calibrated. Standardized methods were used to identify and measure preoperative and postoperative Ch positions. Significant correlations were detected between extent of maxillary downgrafting and inferior movement of the Ch in group 1 (r = 0.988, P = 0.001) and group 3 (r = 0.915, P = 0.001). Also, significant correlations were detected between extent of mandibular advancement and anterior movement of the Ch in group 3 (r = 0.561, P = 0.046) and group 4 (r = 0.661, P = 0.005). The findings indicate that, in patients who undergo bilateral sagittal split ramus osteotomy/Le Fort I surgeries, mandibular advancement moves Ch anteriorly and maxillary downgrafting moves Ch inferiorly.

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“…Peak et al evaluated the changes in lip morphology following mandibular setback in class III patients [20]. They demonstrated that the frontal view of the lip area did not change significantly after surgery.…”

Section: Discussionmentioning

confidence: 99%

Hard and Soft Tissue Changes in Patients with Borderline Class III Malocclusion after Maxillary Advancement or Mandibular Setback Surgery: A Cross-Sectional Study

Fateh¹,

Nucci²,

Jamilian³

et al. 2020

DOBCR

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Background: The primary aim of this study was to assess the esthetic profile and hard and soft tissue changes in patients with borderline class III malocclusion after maxillary advancement or mandibular setback surgery. The secondary aim was also to evaluate the patients’ face attractiveness after different surgical treatment. Materials and Methods: This observational cross-sectional study evaluated 50 patients with borderline class III malocclusion with a mean age of 29 ± 4 years treated from 2014 to 2019. They were divided into two groups based on the type of surgical treatment underwent: 13 patients were treated with mandibular setback (4 males, 9 females), and 37 patients with maxillary advancement (16 males, 21 females). Hard and soft tissue parameters were measured pre and postoperative evaluation. Frontal and profile photographs of these patients were judged by 15 orthodontists, 15 oral and maxillofacial surgeons, and 15 laypeople before and after surgery. The most and the least attractive profiles were scored 10 and 0, respectively. T-test was used to analyze normally distributed data while Mann-Whitney test for non-normally distributed data. The Kruskal-Wallis test was used to compare the esthetic judgement between the three groups of observers. Pairwise comparisons were carried out using the Mann-Whitney test. Results: Nasolabial angle, SNA, U1/NA (°), U1/NA (mm), L1/NB (°) and L1/NB (mm) were significantly different between the two groups p<0.04, p<0.001, p<0.001, p<0.005, p<0.07, p<0.08, p<0.01 respectively Orthodontists, oral and maxillofacial surgeons, and laypeople all gave a lower score to mandibular setback and higher score to maxillary advancement in terms of facial profile esthetics (P<0.001). Conclusion: Some cephalometric parameters were significantly different between the two groups. The maxillary advancement seemed to provide better results in facial profile esthetics than mandibular setback for patients with borderline class III malocclusion.

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Changes of lip morphology following mandibular setback surgery using 3D cone-beam computed tomography images

Cited by 13 publications

References 23 publications

Changes in Smile Parameters Following Surgical-orthodontic Treatment for Skeletal Class III Malocclusion

Changes in Smile Parameters Following Surgical-orthodontic Treatment for Skeletal Class III Malocclusion

Effect of Orthognathic Surgery on Movement of the Cheilion

Hard and Soft Tissue Changes in Patients with Borderline Class III Malocclusion after Maxillary Advancement or Mandibular Setback Surgery: A Cross-Sectional Study

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