Musculoaponeurotic architecture of the human masseter muscle: an in vivo ultrasonographic study of architectural changes during mandibular protrusion and lateral excursions.

Autor: Vassandacoumara V; Oral and Maxillofacial Radiology Graduate Program, Faculty of Dentistry, University of Toronto, Toronto, ON., Gheorghe TI; Department of Surgery, Division of Anatomy, Faculty of Medicine, University of Toronto, Toronto, ON; Oral and Maxillofacial Radiology Graduate Program, Faculty of Dentistry, University of Toronto, Toronto, ON. Electronic address: t.gheorghe@dentistry.utoronto.ca., Leekam R; Department of Surgery, Division of Anatomy, Faculty of Medicine, University of Toronto, Toronto, ON., Lam EWN; Oral and Maxillofacial Radiology Graduate Program, Faculty of Dentistry, University of Toronto, Toronto, ON; Graduate Department of Dentistry, Faculty of Dentistry, University of Toronto, Toronto, ON., Perschbacher SE; Oral and Maxillofacial Radiology Graduate Program, Faculty of Dentistry, University of Toronto, Toronto, ON; Graduate Department of Dentistry, Faculty of Dentistry, University of Toronto, Toronto, ON., Liebgott B; Department of Surgery, Division of Anatomy, Faculty of Medicine, University of Toronto, Toronto, ON; Graduate Department of Dentistry, Faculty of Dentistry, University of Toronto, Toronto, ON., Agur AMR; Department of Surgery, Division of Anatomy, Faculty of Medicine, University of Toronto, Toronto, ON; Graduate Department of Dentistry, Faculty of Dentistry, University of Toronto, Toronto, ON.
Jazyk: angličtina
Zdroj: Oral surgery, oral medicine, oral pathology and oral radiology [Oral Surg Oral Med Oral Pathol Oral Radiol] 2024 May; Vol. 137 (5), pp. 545-553. Date of Electronic Publication: 2024 Feb 12.
DOI: 10.1016/j.oooo.2024.02.001
Abstrakt: Objective: The present study evaluated the in vivo musculoaponeurotic architecture of the superficial head (SH) of the masseter muscle (MM) of asymptomatic participants in excursive mandibular movements compared to the relaxed state as examined with ultrasonography. It was hypothesized that the mean fiber bundle length (FBL) and mean height of the aponeurosis (HA) of the laminae of the SH would differ significantly between the relaxed state and protrusion, ipsilateral excursion, and contralateral excursion.
Study Design: The MM was studied volumetrically in 12 female and 12 male asymptomatic participants bilaterally by using ultrasound imaging. Mean FBL and HA in protrusion and ipsilateral and contralateral excursion were compared to these values in the relaxed state using paired t tests (P < .05). The intraclass correlation coefficient was used to assess intraexaminer reliability.
Results: The SH exhibited multiple laminae. Fiber bundles were found to attach to bone and the superior and inferior aponeuroses. Mean FBL was significantly shorter and mean HA significantly longer in protrusion and the excursions than in the relaxed state although the pattern of altered laminae and aponeuroses differed among the mandibular movements. Intraexaminer reliability was excellent.
Conclusion: Specific changes in mean FBL and mean HA suggest differential contraction of the SH of the MM based on laminar morphology. These findings provide a baseline to investigate musculoaponeurotic changes in patients with myogenic masseter muscle pain.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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