Three-dimensional condylar displacement and remodelling in patients with asymmetrical mandibular prognathism following bilateral sagittal split osteotomy

Abotaleb, Bassam; Bi, Ruiye; Liu, Yang; Jiang, Nan; Telha, Wael

doi:10.1016/j.ijom.2021.08.008

Cited by 11 publications

(6 citation statements)

References 32 publications

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“…We also measured the condylar angles in three time periods to further explore the asymmetry of the condylar angles before operation and the changing trends after operation. The results were similar to those of the published literature [ 18 , 19 , 20 ].…”

Section: Discussionsupporting

confidence: 92%

“…However, only two patients had a recurrence of more than 1 mm, and it was not obvious. Some scholars have reported that there is a weak to severe correlation between the absorption and the displacement of condyle, that is, the more displacement occurs in the direction of a condyle, the more bone absorption happens on the surface [ 18 ]. Absorption of condyle, one of the risk factors for relapse, should be avoided as much as possible.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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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“…The side to which the chin deviates is designated as the deviated side (DS), and the side from which the chin deviates is designated as the non-deviated side (NDS) 10 . The following points are established in the skull: (1) Me: the lowermost point of the chin; (2) Ba: the midpoint of the anterior margin of the foramen magnum; (3) Co_ant: the most anterior point of the condyle; (4) Co_pos: the last point of the condyle; (5) Co_med: the most medial point of the condyle; (6) Co_lat: the most lateral point of the condyle; (7) N: the most anterior point of the nasofrontal suture; (8) Or: the lowest point of the inferior orbital rim; (9) Po: the most superior point of the external auditory canal.…”

Section: Methodsmentioning

confidence: 99%

“…The side to which the chin deviates is designated as the deviated side (DS), and the side from which the chin deviates is designated as the non-deviated side (NDS). 10 The following points are established in the skull: (1) The bilateral condyles are obtained using the standard lines parallel to the FH-plane and via the lowest point of the sigmoid notch, respectively; the degree of deviation is indicated by the separation of the point Me from the MSP-plane. The TMJ space is the region between the condyle's biggest cross-sectional area and the plane enclosed by the marginal line of the articular fossa.…”

Section: Determine the Marker Points And Measurementrelated Reference...mentioning

confidence: 99%

Three-dimensional Reconstruction and Comparison of Temporomandibular Joint Space Volume Before and After Orthognathic Surgery in Patients with Skeletal Class III Malocclusion With Mandibular Deviation

Shi

Sun

Xiao

et al. 2023

Journal of Craniofacial Surgery

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SVS is a complication arising from excessive cerebrospinal fluid shunting after shunt surgery. It has complex pathogenesis and typical clinical symptoms. But abnormalities may not be detected on the images, resulting in misdiagnosis and missing the best time for treatment. Therefore, we cannot rely too much on imaging resources when treating such patients. We also need to make the most correct diagnosis and effective treatment based on the patient's condition and our clinical experience.

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“…Many studies have shown that changes in condylar position after mandibular reconstruction with FFF might cause TMJ clicking, pain, disc displacement and perforation, limited mouth opening or condylar resorption [ 3 , 5 , 11 ]. Wei et al analyzed the CT images of 16 patients’ TMJs pre- and postoperatively and found that the ipsilateral condyles moved anteroinferiorly immediately after surgery and then moved anterosuperiorly thereafter [ 12 ].…”

Section: Discussionmentioning

confidence: 99%

Comparison of condylar position after free fibular flap mandibular reconstruction using computer-assisted and traditional techniques

Wang,

Li,

Liao

et al. 2024

BMC Oral Health

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Objectives To compare the changes in condylar position after mandibular reconstruction with free fibular flap(FFF) and the differences between computer-assisted techniques and traditional methods on CT images. Methods Thirty-four patients who underwent mandibular reconstruction with free fibular flap were selected according to the inclusion and exclusion criteria. In the 3D group, virtual surgical planning (VSP) with osteotomy cutting plate and placement guiding plate were used, while the traditional group underwent freehand reconstruction. The CT data of 68 temporomandibular joints (TMJs) were recorded before and immediately after surgery. The condylar position was evaluated by measuring the anterior space (AS), posterior space (PS) and superior space (SS), and the ln (PS/AS) was calculated according to the method proposed by Pullinger and Hollender. Results In the patients included in the 3D group, the condyle on the ipsilateral side moved slightly backward; however, in the patients in the traditional group, the ipsilateral side moved considerably anteroinferior. No obvious changes on the contralateral side were noted. In the 3D group, 33% of ipsilateral condyles were in the posterior position postoperatively when compared with the preoperative position (13%). In the traditional group, the number of ipsilateral condyles in the anterior position increased from 4 to 10, accounting for 53% postoperatively. Contrary to the traditional group, the 3D group presented less condylar displacement on the ipsilateral side postoperatively. Conclusions This study showed a decreased percentage of change in condylar position postoperatively when VSP was used. Virtual surgical planning improved the accuracy of FFF mandibular reconstruction and made the condylar position more stable.

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Three-dimensional condylar displacement and remodelling in patients with asymmetrical mandibular prognathism following bilateral sagittal split osteotomy

Cited by 11 publications

References 32 publications

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

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

Three-dimensional Reconstruction and Comparison of Temporomandibular Joint Space Volume Before and After Orthognathic Surgery in Patients with Skeletal Class III Malocclusion With Mandibular Deviation

Comparison of condylar position after free fibular flap mandibular reconstruction using computer-assisted and traditional techniques

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