The volumetric ratio of the tongue to the oral cavity has been recognized to be one of the important factors for the maintenance of stable occlusion. Oral cavity capacity is changed after orthognathic surgery in patients with mandibular prognathism; however, the volumetric changes of the oral cavity including the tongue before and after surgery have not been analyzed. The purpose of this study was to evaluate the morphological and volumetric changes of the tongue and oral cavity following orthognathic surgery using a newly developed vinyl polysiloxane impression method. The study was performed in fifteen subjects who underwent surgical orthognathic treatment. Impressions of the tongue together with the oral cavity were obtained before orthognathic surgery and 1, 3, and 6 months after orthognathic surgery. These impression patterns were scanned using cone-beam computed tomography (CT), and three-dimensional (3D) images of the oral cavity including the tongue, and the upper and lower dental arches were reconstructed. The morphological and volumetric changes in the oral cavity capacity and the tongue volume were examined. The volume of the tongue with the volume of the oral cavity decreased after orthognathic surgery. There was a correlation between the decrease in the oral cavity capacity and tongue volume. The volumetric ratio of the tongue to the oral cavity seems to be maintained before and after orthognathic surgery. VPS method, free from radiation exposure, may be useful for investigating the morphological and volumetric changes of the tongue and oral cavity, which may possibly influence the stability of the dental arch and occlusion during surgical orthodontic treatment.

中文翻译：

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颌骨矫正术正颌手术前后舌头和口腔形态和体积变化的3D评估：一项初步研究。

舌头与口腔的体积比已被认为是维持稳定闭塞的重要因素之一。下颌前突患者正颌手术后口腔容量发生变化；然而，尚未分析手术前后口腔（包括舌头）的容积变化。这项研究的目的是使用新开发的乙烯基聚硅氧烷压印方法评估正颌手术后舌头和口腔的形态和体积变化。该研究是在15位接受正颌外科手术治疗的受试者中进行的。在正颌外科手术之前以及正颌外科手术之后1、3和6个月获得舌头和口腔的印象。使用锥形束计算机断层扫描（CT）扫描这些印模，并重建包括舌头在内的口腔的三维（3D）图像，并重建上下牙弓。检查了口腔容量和舌头体积的形态和体积变化。正颌外科手术后，舌头的体积和口腔的体积减少了。口腔容量的减少与舌头体积之间存在相关性。在正颌外科手术前后，舌头与口腔的体积比似乎保持不变。VPS方法无辐射暴露，可能有助于研究舌头和口腔的形态和体积变化，