The effect to masticatory development by mandibular movement and blood flow

研究总结如下：(1)利用Selpot系统对9名乳牙期儿童和9名恒牙期成人的前移和侧移进行了测量和比较。研究发现，与恒牙期相比，乳牙期的偏移量可以更多地水平移动和更前移，下降幅度更小。这些发现的潜在原因可能是咬合功能的生理发育、成熟和适应。(2)本研究的目的是评估儿童在模拟正中开合过程中被动和主动肌肉张力、TMJ斜韧带张力和髁状突张力的动态特征。每个肌肉的简化活动张力曲线由三角函数Y=A^&lt；**&gt；sin(2pi^&lt；**&gt；B^&lt；**&gt；(t-C)2)建模，其中A代表肌电幅度，B代表周期持续时间，C代表起效时间。中线开合爪(最大INT…根据同一儿童的颌骨运动数据，模拟更多的咬合距离10 mm，周期0.8s)。在开口期，要张开颌骨10 mm，需要在翼外肌下头张张7N，在二腹肌张开3N。闭合期所有下颌提升肌的被动张力值均在闭合期开始时小于3N。功能过程中斜韧带无张力。(3)应用仿生器对安氏II类错牙合患者矫治前后下颌骨的体积变化进行了较为准确的测量。头影测量分析显示治疗后ANB角减小，SNP角增大，上颌中切牙舌侧倾斜，下颌中切牙唇侧倾斜。对研究模型的量纲分析表明，磨牙间宽度增加，而覆盖和覆盖都减少。采用非接触式三维测量系统测量口腔体积。治疗后口腔的上颌部和下颌部及口腔总体积均增加了20%。较少

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