Sonoelastographic evaluation of the masseter muscle before and after mandibular setback surgery

Etöz, Meryem; Demirbaş, Ahmet Emin; Topsakal, Kübra Gülnur; Etöz, Osman A.; Kaya, Mehmet; Alkan, Alper

doi:10.4103/njcp.njcp_624_19

Cited by 4 publications

(2 citation statements)

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“…9,10 Early studies of the masseter dimensions have been conducted at the 2-dimensional level of thickness, cross-sectional area, and length. Trawitzk et al 11 reported an increase in masseter thickness after Orthognathic Surgery in patients with skeletal Class III facial deformities, and Etoz et al 12 's findings are consistent with this. Coclici et al 7 reported that there was no significant difference in the length of the masseter before and after surgery, and Ueki and colleagues showed no significant change in the cross-sectional area of the masseter after orthognathic surgery.…”

Section: Discussionmentioning

confidence: 73%

Assessment of Masseter Volume and Postoperative Stability After Orthognathic Surgery in Patients With Skeletal Class III Malocclusion With Facial Asymmetry

Zhao,

Chen,

Wang

et al. 2024

Journal of Craniofacial Surgery

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Objective: This study aimed to evaluate the effect of orthognathic surgery on masseter volume in patients with skeletal Class III malocclusion with facial asymmetry and the effect of masseter volume on stability in orthognathic surgery. Methods: This research studied 16 patients with Class III malocclusion with facial asymmetry who received combined orthodontic-orthognathic treatment and underwent craniofacial computed tomography (CT) before (T0), 2 weeks after (T1), and 6 months after (T2) surgery. Three-dimensional (3D) CT images were retrospectively analyzed, using 3D volume reconstruction to obtain the masseter volume and examine the impact of the masseter volume on stability in orthognathic surgery. Results: A statistically significant difference (P < 0.05) in the volume of the masseter was found up to 6 months after orthognathic surgery compared with the preoperative period, and the reduction in the masticatory muscle volume on the lengthened side is greater than on the shortened side (P < 0.05). The volume of both masseters differed according to facial asymmetry, and the difference was significantly reduced after orthognathic surgery (P < 0.05). During the period time (T1–T2), cephalometric maxillary marker points were not significantly different (P > 0.05), and mandibular marker points were significantly anteriorly shifted (P < 0.05). There was an association between the masseter volume and anterior shift of point B (R > 0.5, P < 0.05), the upward and anterior shifts of the gonion point differed between the lengthened and shortened sides (P < 0.05). Conclusion: The size of the masseter becomes smaller 6 months after orthognathic surgery, and orthognathic surgery improves both bone and soft tissue symmetry. A larger sagittal relapse of mandibular setback occurred in patients with greater masseter volume. Considering these alterations may be helpful in planning orthognathic surgery.

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