Three-Dimensional Evaluation of the Postsurgical Stability of Mandibular Setback With the Surgery-First Approach: Comparison Between Patients With Symmetry and Asymmetry

Sun, L.; Lee, Kyungmin Clara

doi:10.1016/j.joms.2019.03.020

Cited by 11 publications

(10 citation statements)

References 23 publications

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“…After 3 month, mild skeletal changes occurred without clinical signi cance. Our results advanced previous studies' time point when the major amount of mandibular postsurgical relapse occured within 6 month 22 .…”

Section: Discussionsupporting

confidence: 91%

Three-dimensional evaluation of postsurgical stability of Surgery-first approach in Skeletal Class III patients with two-jaw surgery and maxillary premolar extraction and study of the influencing factors.

Jiang

Zhongpeng

et al. 2022

Preprint

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Objectives to evaluate three-dimensional postsurgical stability of surgery-first approach with 2-jaw surgery and maxillary premolar extraction in skeletal class III patients and excavate factors influencing the relapse. Material and methods 24 patients were enrolled in this prospective cohort study. Serial cone-beam computer tomography images were superimposed and measured the surgical stability at the presurgical examination, 1 week, 3 month, 6 month and 12 month postoperatively. Patients were grouped by the amount of mandible sagittal relapse(stable group, n = 8; highly unstable group, n = 7). Skeletal and dental morphological variables, the amount of surgical changes, and orthodontic-related variables were compared between groups and analyzed for correlations with postsurgical stability. Results Considerable amount of pronation relapse on mandible were within three month postoperatively. The maxilla remained clinically stable. The coronoid process height, posterior maxillary height, the mandibular setback, distal segment intraoperative rotation and the amount maxillary second molar orthodontic intrusion showed significant difference between groups. The above variables, mandibular height, occlusal vertical dimension, and the mandibular and anterior maxillary intraoperative descent were significantly correlated with postoperative instability. Conclusions Mandibular pronation relapse mainly in the first three months after surgery.The maxilla postsurgical position is clinically stable. The factors for instability in the surgery-first approach include a longer coronoid process, longer facial height, a wider occlusal vertical dimension, greater surgical setback and descent, and more maxillary second molar intrusion. Clinical relevance Results can provide reference for patient selection, surgical planning and preoperative dental alignment stimulation for surgery-first approach. Trial Registration ChiCTR2200055787

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Section: Discussionsupporting

confidence: 91%

Three-dimensional evaluation of postsurgical stability of Surgery-first approach in Skeletal Class III patients with two-jaw surgery and maxillary premolar extraction and study of the influencing factors.

Jiang

Zhongpeng

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Therefore, it could be proposed that BSSRO has good stability for asymmetric mandibular prognathism. Most studies have reached the same conclusions [ 15 , 16 ].…”

Section: Discussionmentioning

confidence: 67%

BSSRO Improves Mandibular Morphology Mainly through Correction of Body Length and Volume in Patients with Asymmetric Mandibular Prognathism

Liu

2022

JCM

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Purpose: The purpose of this study is to analyze the change and stability of mandibular morphology in patients with asymmetric mandibular prognathism after bilateral sagittal split ramus osteotomy (BSSRO). Methods: We retrospectively analyzed fifty patients with asymmetric mandibular prognathism from the West China Hospital of Stomatology, Sichuan University, between January 2018 to March 2021. The spiral CT data before surgery, within two weeks after surgery, and at more than six months after surgery of each patient were collected. According to the deflection direction of the chin, the bilateral mandibles were defined as the long side and the short side. The morphological data of the bilateral condyle, the mandibular ramus, and the mandibular body were analyzed to determine the effect and stability of BSSRO on asymmetric mandibular prognathism. Results: It was found that the long-side mandible had greater condylar volume and diameter, mandibular ramus height and volume, and mandibular body length and volume (p < 0.05) before surgery. After surgery, the volume of the mandibular ramus increased, while the length and volume of the mandibular body decreased (p < 0.05) at the long side of the mandible; the morphological changes of the mandibular ramus and body at the short side of the mandible were not statistically significant (p > 0.05). When comparing the long and short sides of the mandible, the long side still had greater height and volume of the mandibular ramus (p < 0.01). The volume difference of the mandibular body from the two sides was corrected (p > 0.05), and the length difference of the mandibular body from the two sides was overcorrected (p < 0.05). At more than six months after surgery, the volume of the mandibular ramus and body increased, while their height decreased at the long side of the mandible (p < 0.05). For the other side, or the short side, the volume of the ramus and body increased, too. However, their height decreased (p < 0.01). Conclusion: The results of this study suggested good effect and stability of BSSRO on asymmetric mandibular prognathism, except for the correction of ramus height and volume.

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“…After configuration of the two reference planes and hard tissue landmarks via the Invivo 6 software as described above, the coordinates of 3D landmarks and the binarization thresholds of bone (320-520 HU) were saved in an Excel file format. A custom program using MATLAB 2019b (MathWorks, Natick, MA, USA) was used for successive image processing for all methods in this study [17,19].…”

Section: Data Acquisition 3d Landmark Determination and Image Reorimentioning

confidence: 99%

A New Approach to Set the Absolute Midsagittal Plane of the Mandible Using a Similarity Index in Skeletal Class III Patients with Facial Asymmetry

et al. 2020

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This study sought to test the feasibility of a newly developed plane called computed modified absolute mandibular midsagittal plane (cmAMP) based on the similarity index (SI) for evaluating the stereoscopical symmetry of the mandible by comparison with other proposed midsagittal planes. This study involved 29 adult patients (15 men, 14 women; average age, 23.1 ± 6.9 years) with skeletal Class III facial asymmetry who underwent bimaxillary orthognathic surgery. Using cone-beam computed tomography images taken before and 1 year after surgery, cmAMP with the highest SI value between the two anterior segments of the hemi-mandible was set by a computer algorithm. Results show that the SI using cmAMP had the highest value (0.83 ± 0.04) before surgery compared to the other midsagittal planes, and was not significantly different from the SI (0.80 ± 0.05) using a facial midsagittal plane (MSP) after surgery. The distance (1.15 ± 0.74 mm) and angle (2.02 ± 0.82°) between MSP and cmAMP after surgery were significantly smaller than those between MSP and other midsagittal planes. In conclusion, the cmAMP plane best matches the two anterior segments of hemi-mandible symmetrically and is the closest to MSP after orthognathic surgery in skeletal Class III patients with facial asymmetry.

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Three-Dimensional Evaluation of the Postsurgical Stability of Mandibular Setback With the Surgery-First Approach: Comparison Between Patients With Symmetry and Asymmetry

Cited by 11 publications

References 23 publications

Three-dimensional evaluation of postsurgical stability of Surgery-first approach in Skeletal Class III patients with two-jaw surgery and maxillary premolar extraction and study of the influencing factors.

Three-dimensional evaluation of postsurgical stability of Surgery-first approach in Skeletal Class III patients with two-jaw surgery and maxillary premolar extraction and study of the influencing factors.

BSSRO Improves Mandibular Morphology Mainly through Correction of Body Length and Volume in Patients with Asymmetric Mandibular Prognathism

A New Approach to Set the Absolute Midsagittal Plane of the Mandible Using a Similarity Index in Skeletal Class III Patients with Facial Asymmetry

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