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- Title
Early and long-term changes in the muscles of the mandible following orthognathic surgery.
- Authors
Coclici, Alina; Hedeşiu, Mihaela; Bran, Simion; Băciuţ, Mihaela; Dinu, Cristian; Rotaru, Horatiu; Roman, Raluca
- Abstract
Objectives: The aim of the present study is to evaluate the early and long-term postoperative dimensional changes of the muscles of the mandible in patients with orthognathic surgery for class II and class III malocclusions by using ultrasonography (US). Material and methods: Twenty-six patients who underwent bimaxillary orthognathic surgery for class II or class III malocclusions (14 and 12 patients, respectively) were ultrasonographically examined. The length, width, and cross-sectional area of the masseter and suprahyoid muscles were measured at three different time points: T0 (preoperatively), T1 (early postoperatively at 1 month after the surgery), and T2 (late postoperatively at 9 months). A repeated measures ANOVA was used to calculate statistically significant dimensional changes of the mandibular muscles. Results: Statistically significant dimensional changes were found postoperatively in class II malocclusion patients only. The digastric muscle showed higher values for the length and lower values for the width (p <.05) at T1. The geniohyoid muscles were higher in length at T1 and lower in cross-sectional area (CSA) (p <.05) at T2. A decreased measured length and an increased measured width were found in case of the mylohyoid muscle (p <.05) at T2. The early and long-term postoperative dimensional changes of the masseter muscle were not statistically significant. Conclusions: The mandibular muscles showed a variable adaptive response to the orthognathic surgery. US should be considered for the long-term follow-up of muscular dimensional changes in class II malocclusion patients. Clinical relevance: From a clinical perspective, US is a reliable, non-invasive, and widely available method, which allows monitoring the postoperative muscular changes occurring in class II malocclusion patients.
- Subjects
ORTHOGNATHIC surgery; MUSCLES; MASSETER muscle; MANDIBLE; MALOCCLUSION
- Publication
Clinical Oral Investigations, 2019, Vol 23, Issue 9, p3437
- ISSN
1432-6981
- Publication type
Article
- DOI
10.1007/s00784-019-03019-3