Mayil Meltem, Keser Gaye, Demir Arzu, Pekiner Filiz Namdar
Department of Oral and Maxillofacial Radiology, Marmara University, Faculty of Dentistry, Istanbul, Turkey.
Open Dent J. 2018 Sep 28;12:723-734. doi: 10.2174/1745017901814010723. eCollection 2018.
The purpose of the present study was to examine ultrasonographic appearances of Masseter Muscle (MM) in dentate and edentulous patients without Temporomandibular Disorder (TMD).
The thickness of the MM in 25 dentate (mean age: 30,68 ± 10,49) and 24 edentulous (mean age: 61,46 ± 9,71) patients, who visited routine dental examination, was measured at rest and at maximum contraction bilaterally. Examinations were performed using an Aloka Prosound α6 (Hitachi Aloka Medical Systems, Tokyo, Japan) equipped with an 8 MHz-wide bandwidth linear active matrix transducer (ranging from 1 to 15 MHz). The visibility and width of the internal echogenic bands of the MM were also assessed and the muscle appearance was classified as I of III types. Type I, characterized by the clear visibility of the fine bands; Type II, thickening echogenicity of the bands; Type III, disappearance or reduction in a number of the bands.
MM thickness at rest and contraction in the dentate group were significantly higher than the edentulous group ( <0.05). Type I was the most common echogenic type in both dentate (right:16 (64%), left; 15 (60%)) and edentulous patients (right; 22 (91.7%), left; 18 (75%)). In a dentate group, type II was significantly higher than the edentulous group in both the right and left sides ( <0.05; <0.01, respectively). Age and gender seemed to have no significant effect on the echogenic type ( ˃0.05).
There were significant differences in the thickness at rest and contraction between the dentate and edentulous groups. It was clarified that ultrasonographic features of the MM in dentate and edentulous patients were different.
本研究旨在检查无颞下颌关节紊乱病（TMD）的有牙颌和无牙颌患者咬肌（MM）的超声表现。
对25名有牙颌患者（平均年龄：30.68±10.49岁）和24名无牙颌患者（平均年龄：61.46±9.71岁）进行常规牙科检查，在静息状态和双侧最大收缩状态下测量咬肌厚度。使用配备8MHz宽带线性有源矩阵换能器（频率范围为1至15MHz）的阿洛卡Prosoundα6（日本东京日立阿洛卡医疗系统公司）进行检查。还评估了咬肌内部回声带的可见性和宽度，并将肌肉外观分为I至III型。I型，特征为细带清晰可见；II型，带的回声增厚；III型，带的数量减少或消失。
有牙颌组静息和收缩时的咬肌厚度显著高于无牙颌组（P<0.05）。I型是有牙颌患者（右侧：16例（64%），左侧：15例（60%））和无牙颌患者（右侧：22例（91.7%），左侧：18例（75%））中最常见的回声类型。在有牙颌组中，II型在右侧和左侧均显著高于无牙颌组（分别为P<0.05；P<0.01）。年龄和性别似乎对回声类型没有显著影响（P>0.05）。
有牙颌组和无牙颌组在静息和收缩时的厚度存在显著差异。明确了有牙颌和无牙颌患者咬肌的超声特征不同。
