Miotti A M
Am J Orthod. 1982 Oct;82(4):310-7. doi: 10.1016/0002-9416(82)90465-1.
A study was undertaken to investigate the effect of surgical treatment of mandibular prognathism on mandibular and hyoid movements during speech and swallowing in fourteen individuals. The material consisted of cineradiographic records of adult prognathic patients before and after the surgical correction. The records were obtained with a 16 mm, cinecamera at a speed of thirty-two frames per second. Image intensification was used, and the head of the patient was positioned in a cephalostat during the recording. Postoperative recordings were taken at about 1 month after the removal of intermaxillary fixation. To improve the accuracy of the analysis, templates of the skeletal structures were prepared. The following cephalometric landmarks were located and marked on the template: the tip of the upper central incisor, the occlusal plane, pogonion, and hyoid point. The coordinates of the cephalometric points were recorded by means of a Lysta dental digitizer linked to a Hewlett-Packard 9815A desk-top computer. The significance of the difference between the pre- and postoperative values was determined by the Student's test. The results were examined for variations in the vertical and horizontal ranges of movement and in the surface areas covered by pogonion and hyoid during movement. Correlation between several pairs of variants was tested. Large individual variations were found in the pattern and range of movement of the mandible and hyoid both pre- and postoperatively. The coefficients of correlation between several parameters showed some significant correlation, which disappeared after surgical correction. A general trend for a reduction in most parameters studied was shown. Some correlation between the amount of setback and the mandibular movement was also found. The hyoid and mandibular movements in tongue-reduction cases do not differ significantly. Lines of further investigation are suggested, with larger and possible more homogeneous samples.
一项研究旨在调查十四名个体下颌前突手术治疗对言语和吞咽过程中下颌及舌骨运动的影响。材料包括成年前突患者手术矫正前后的X线电影记录。记录通过一台16毫米电影摄影机以每秒32帧的速度获得。采用影像增强技术，记录过程中患者头部置于头颅定位仪中。术后记录在去除颌间固定约1个月后进行。为提高分析准确性，制备了骨骼结构模板。在模板上确定并标记了以下头影测量标志点：上颌中切牙切端、咬合平面、颏前点和舌骨点。头影测量点的坐标通过与惠普9815A台式计算机相连的Lysta牙科数字化仪记录。术前和术后值之间差异的显著性通过学生检验确定。对运动的垂直和水平范围以及颏前点和舌骨在运动过程中覆盖的表面积变化进行了研究。测试了几对变量之间的相关性。术前和术后下颌骨和舌骨的运动模式和范围均存在较大个体差异。几个参数之间的相关系数显示出一些显著相关性，手术矫正后消失。研究的大多数参数呈现出普遍降低的趋势。还发现了后退量与下颌运动之间的一些相关性。舌缩小病例中舌骨和下颌运动无显著差异。建议进行进一步研究，采用更大且可能更同质的样本。
