Morphological study of the changes after sagittal split ramus osteotomy in patients with facial asymmetry: measurements of 3-dimensional modelling

Zhang, Y.-L.; Liu, Y.; Shu, Jingheng; Xu, Xin; Liu, Z.

doi:10.1016/j.bjoms.2018.10.005

Cited by 19 publications

(9 citation statements)

References 21 publications

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“…Compared with the previous research, the condylar and ramus angles and joint spaces of facial asymmetry patients were more significantly different from normal people than those of MP patients, [30] which suggested that facial symmetry had a huge influence on the TMJ morphology parameters. In addition, the prevalence of preoperative TMD in facial asymmetry patients (70%) [29] was higher than that in MP patients (29%).…”

Section: Discussionmentioning

confidence: 56%

“…The magnitudes of SRAL, MJSL, LJSR, and SJS of patients with facial asymmetry were significantly different between the Pre and Post groups. [29,30] Because of the good facial symmetry of MP patients in this study, the effect of SSRO on TMJ morphology parameters of MP patients was not as obvious as that on patients with facial asymmetry. SSRO corrected TMD symptoms of 57% of patients without introducing postoperative symptoms.…”

Section: Discussionmentioning

confidence: 85%

“…However, the reduction of joint spaces could lead to squeezing of articular disc in TMJ, [29] which can increase the load on TMJ and lead to osteoarthritis. [30] This in turn may cause pain in the joint and other symptoms of TMD.…”

Section: Discussionmentioning

confidence: 99%

“…It can be seen that the asymmetry of angle might cause TMD symptoms. [30] After SSRO, the symmetry of condylar angles was slightly improved and the AJS was greater. Furthermore, the problem of clicking in Case 3 was alleviated.…”

Section: Discussionmentioning

confidence: 99%

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Effect of sagittal split ramus osteotomy on morphologic parameters of temporomandibular joint in patients with mandibular prognathism

Shu²,

Deng³

et al. 2019

Medicine

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The purpose of this study was to evaluate the change in three-dimensional morphology and clinical symptoms of temporomandibular joint (TMJ) in class III dentofacial deformity patients postoperatively for 6 months after sagittal split ramus osteotomy (SSRO). Seventeen patients with skeletal Class III malocclusion and 10 asymptomatic volunteers (classified as Control group) were recruited for the study and underwent cone-beam computed tomography scanning. The geometries of the maxilla and mandible were reconstructed using MIMICS (Materialise, Leuven, Belgium). The morphologic measurements of the patients’ TMJs were done before surgery and at 6-month follow-up – named as Pre and Post groups, respectively. The joint spaces (medial joint space, superior joint space, lateral joint space, anterior joint space, and posterior joint space) of the Control group were significantly greater than those of the Pre and Post groups ( P < .05), and SSRO did not significantly change the TMJ morphology parameters. Five patients were found to have preoperative temporomandibular disorder (TMD) symptoms, and 3 of them were relieved at 6 months after surgery. Postoperative TMD symptom was observed in 1 patient without preoperative TMD symptom. SSRO did not markedly alter the TMJ morphology of the patients with mandibular prognathism. The effects of SSRO on TMD symptoms should be related to the type of deformity.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of sagittal split ramus osteotomy on morphologic parameters of temporomandibular joint in patients with mandibular prognathism

Shu²,

Deng³

et al. 2019

Medicine

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“…These resolutions and thicknesses about CT and MRI were widely used in other studies and proven to be accurate. [22][23][24] Moreover, since the thickness of the discs were about 0.5-2 mm, the disc models were constructed at the sagittal plane to fully cover enough slices. The models were formatted as STL files and assembled by matching condyle models from the CT and MRI scans.…”

Section: Subject and Data Acquisitionmentioning

confidence: 99%

Biomechanical behaviour of temporomandibular joints during opening and closing of the mouth: A 3D finite element analysis

Shu

Liu³

et al. 2020

Numer Methods Biomed Eng

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Temporomandibular joints (TMJs) constitute a pair of joints that connect the jawbone to the skull. TMJs are bilateral joints which work as one unit in conducting daily functions such as speaking, mastication, and other activities associated with the movement of the jaw. Issues associated with the TMJs may arise due to various factors—one such factor being the internal load on the TMJ. These issues may contribute to temporomandibular disorders (TMD). This study aims to evaluate the mandibular trajectories and the associated stress changes during the process of opening the mouth on the TMJs of an asymptomatic subject. The mouth opening motion was recorded by a motion capturing system using models of the mandible and maxilla constructed based on the computed tomography (CT). Two discs constructed based on magnetic resonance imaging (MRI). Finite element analysis was performed on the relative motion of the mandible to the maxilla and validated. The process modelled by these displacements provided less than 10% error in terms of deformation. The simulation results indicate that the lateral intermediate zone—the head and neck of the mandible—and the articular eminence sustained the most significant stresses during the mouth opening motion. The results also suggested that the stresses increase as the range of opening increases with the greatest von Mises stress, tensile, and compressive stress found at the position of maximal opening.

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Changes in 3-Dimensional Measurements of Masseter Muscle After Orthognathic Surgery in Patients with Facial Asymmetry

Yang,

Piao,

Liu

et al. 2024

Aesth Plast Surg

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Objective The aim of this study was to quantitatively evaluate morphological and volumetric changes in the masseter muscle using 3-dimensional analysis of facial asymmetry patients and to identify factors influencing these changes before and after orthognathic surgery. Methods [Reviewer1 (2)]A single-center retrospective cohort study was conducted on twenty-two patients with deviation of the chin > 4 mm. Masseter muscle volume and morphology were measured at different periods during long-term follow-up (mean 15 ± 3.2 months). Factors related to changes in masseter muscle cross-sectional area and volume analyzed were also analyzed. Results [Reviewer1 (2) and (9)]The volume and cross-sectional area of the masseter muscle on the non-deviated side reduced by 13.5% (P < 0.05) and 16.4% (P < 0.05), respectively, after orthognathic surgery. The length of the masseter muscle increased by 13.9% on the deviated side (P < .05) but decreased by 11.7% on the non-deviated side (P < 0.05). The width decreased on the deviated side from T1 to T2 (13.51 ± 2.09 mm vs. 12.04 ± 1.39 mm), but the non-deviated side showed an opposite tendency (10.81 ± 1.31 mm vs. 12.69 ± 2.37 mm). The difference in masseter muscle length and width between the two sides significantly reduced after surgery (P < 0.05). There was a noticeable decrease in the asymmetry in the muscle in proportion to the degree of the occlusal plane angle. Conclusion Masseter muscle asymmetry exists in patients with facial asymmetry, but it could be improved with maxilla-mandible correction. Atrophy of the masseter muscle after orthognathic surgery was greater in patients with a large inclined occlusal plane angle due to improved dental compensation. Level of Evidence IV This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

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Morphological study of the changes after sagittal split ramus osteotomy in patients with facial asymmetry: measurements of 3-dimensional modelling

Cited by 19 publications

References 21 publications

Effect of sagittal split ramus osteotomy on morphologic parameters of temporomandibular joint in patients with mandibular prognathism

Effect of sagittal split ramus osteotomy on morphologic parameters of temporomandibular joint in patients with mandibular prognathism

Biomechanical behaviour of temporomandibular joints during opening and closing of the mouth: A 3D finite element analysis

Changes in 3-Dimensional Measurements of Masseter Muscle After Orthognathic Surgery in Patients with Facial Asymmetry

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