摘要
目的研究在不同角度的咬合斜面条件下相关口颌肌肉及韧带的约束反力的变化规律,为Twin-Block矫治器的临床应用提供理论依据。方法建立颞下颌关节—下颌骨—Twin-Block矫治器系统的三维有限元模型,在此基础上添加相关口颌肌肉和韧带,根据临床及相关研究设计7个实验组(Twin-Block矫治器咬合导板斜面角度分别为40°、45°、50°、55°、60°、65°、70°),计算并分析相关口颌肌肉和韧带的约束反力。结果咬肌深层前份、咬肌深层后份、颞肌前份、颞肌后份、茎突下颌韧带及蝶下颌韧带的受力随着Twin-Block矫治器咬合导板斜面角度的增大而增大。约束反力最大值为82.57 N,最小值为0.07 N。结论 1)颞肌前份、咬肌深层前份、咬肌深层后份、颞肌后份、茎突下颌韧带及蝶下颌韧带在Twin-Block矫治器引导下颌向前的过程中均受到被动牵张力,这对下颌骨的适应性改建有重要作用。2)本实验设计的7个实验组中的咬合倾斜角度均在患者生理承受范围之内,均在临床可选择之列。
Objective To study the regularity of the passive tensile of the masticatory muscles and ligaments by Twin-Block appliance under various bite reconstruction, and to provide some biomechanical references for the clinical use and improvement of Twin-Block appliance. Methods ＂Temporomandibular joint, mandible and Twin-Block appliance＂ model was set up by the three dimensional finite element method, and the related masticatory muscles and ligaments were added on it. Seven experimental groups were designed according to the clinical and research, the occlusal inclined plate＇s angles of Twin-Block appliance were 40., 45., 50. 55., 60., 65. and 70.. The passive tensile in the masticatory muscles and ligaments were analyzed by the computer. Results Under various experimental groups, the passive tensile in the anterior deep masseter（AM）, the posterior deep masseter（PM）, the anterior temporalis（AT）, the posterior temporalis （PT）, the stylomandibular ligament and sphenomandibular ligament improved with the increased slant angles of occlusal guide. The maximum value of the passive tensile was 82.57 N, the minimum value was 0.07 N. Conclusion Din various experimental groups, AT, AM, PM, PT, stylomandibular ligament and sphenomandibular ligament are subject to passive tension force in the process of Twin-Block appliance guiding the mandibular forward and play the important role on the remodeling of the mandible. 2）All groups of oeclusal inclined plate＇s angle are in phy- siologically tolerable range and can be used in clinic.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2013年第2期172-177,共6页
West China Journal of Stomatology
