The effect to masticatory development by mandibular movement and blood flow

研究内容如下：（1）采用Selspot系统对9名乳牙列儿童和9名恒牙列成人的前屈和侧偏进行了测量和比较。结果发现，乳牙列的偏移可以更水平地移动，更向前，与恒牙列相比，下降较小。这些发现的根本原因可能是生理生长，成熟和咬合功能的适应。(2)本研究的目的是估计动态特性的被动和主动的肌肉张力，张力在斜韧带的颞下颌关节和髁突的力量在模拟中线颌骨打开和关闭的儿童。每个肌肉的简化主动张力曲线由三角函数Y=A^<**>sin（2 π ^<**> B^<**>（t-C）2）建模，其中A表示EMG振幅，B表示周期持续时间，并且C表示起始时间。中线钳口张开和闭合（最大间距 关于我们 切距10 mm，循环时间0.8s）。在张开期，二腹肌张力为3 N，翼外肌下头张力为7 N，才能张开颌骨10 mm。在闭合期，所有下颌升肌在闭合期开始时均出现小于3 N的被动张力。功能期间斜韧带无张力。髁突力在钳口张开时增加至7 N，在钳口闭合时减小至约1 N。(3)本研究的目的是准确地估计使用bionator治疗安氏II类错（牙合）前后适当口腔的体积变化。头影测量分析显示，ANB角减少，SNP角增加，上颌中切牙的舌向倾斜和下颌中切牙的唇向倾斜治疗后。研究模型的尺寸分析表明，磨牙间宽度增加，而相比之下，overbite和overjet都减少。采用非接触式三维测量系统测量正常人口腔容积。治疗后上颌、下颌固有口腔及总体积均增加20%。少

The research summary was as follows ;(1) With use of a Selspot system, the protrusive and lateral excursions of nine children with the primary dentition and nine adults with the permanent dentition were measured and compared. It was found that the excursions of the primary dentition can move more horizontally and more forward with small descent compared with the permanent dentition. The underlying reason for these findings may be physiological growth, maturation, and adaptation of the occlusal function.(2) The aim of this study was to estimate dynamic characteristics of passive and active muscle tensions, tensions in the oblique ligament of the TMJ and condylar forces during simulated midline jaw opening and closing in children. The simplified active tension curve for each muscle was modeled by a trigonometric function Y=A^<**>sin (2pi^<**> B^<**> (t-C) 2), in which A represented the EMG amplitude, B the cycle duration, and C the onset time. Midline jaw opening and closing (maximum int … More erincisal distance 10mm, cycle duration 0.8s), were simulated according to jaw motion data from the same child. During the opening phase, tensions of 3N in the digastric muscle and 7N in the inferior head of lateral pterygoid muscle were necessary to open the jaw 10mm. In all mandibular elevator muscles during the closing phase, passive tensionsless than 3N occurred at the beginning of closing phase. There was no tension in the oblique ligament during function. The condylar force increased up to 7N at the end of jaw opening, decreasing to about 1N during jaw closing.(3) The purpose of this study was to exactly estimate the volume changes of the proper oral cavity before and after treatment for Angle's Class II malocclusion using a bionator. The cephalometric analyzes revealed a decrease in the ANB angle, an increase in the SNP angle, a lingual inclination of the maxillary central incisor and a labial inclination of the mandibular central incisor after treatment. The dimensional analyzes of the study models showed that the inter-molar width increased while, in contrast, both the overbiteand overjet decreased. The volume of the proper oral cavity was measured by the non-contact three-dimensional measuring system. Both the maxillary part and the mandibular part of the proper oral cavity as well as the total volume of that increased by 20% after treatment. Less