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首页> 外文期刊>The Journal of Prosthetic Dentistry >A comparison of simulated jaw dynamics in models of segmental mandibular resection versus resection with alloplastic reconstruction.
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A comparison of simulated jaw dynamics in models of segmental mandibular resection versus resection with alloplastic reconstruction.

机译：下颌节段切除与异基因重建切除模型中模拟颌骨动力学的比较。

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STATEMENT OF PROBLEM: Composite mandibular resection resulting in mandibular discontinuity can alter jaw motion, occlusal forces, and mastication, whether or not the jaw is reconstructed. The biomechanical events associated with these changes are difficult to assess clinically and, therefore, are not well documented or researched. PURPOSE: The purpose of this study was to model movements of a mandible with a discontinuity defect, and to compare them to movements of a mandible with its continuity restored by alloplastic reconstruction. MATERIAL AND METHODS: Computational models were created with a novel simulation platform. The variables designed into the models included gravity, external forces, and jaw muscle activity. Each jaw was observed at rest, when opened by external force or by muscle drive, and during the generation of unilateral occlusal force on the nonoperated side. Scarring was simulated with springlike forces. Outputs included individual muscle forces and torques, as well as mandibular incisor and condylar motions. RESULTS: Both models displayed plausible resting postures, and jaw opening with deviation toward the defect side when scarring was simulated. Opening caused by downward force on the incisors differed from that due to muscle activation. Jaw rotations during unilateral molar contact on the unaffected side were muscle specific and influenced by mandibular discontinuity. CONCLUSIONS: Plausible jaw movements after hemimandibulectomy and/or alloplastic reconstruction could be predicted by dynamic modeling. The effect of soft tissue forces on jaw posture and movements varied with the condylar support available. In both models, different opening trajectories were produced by external force on the jaw and by jaw muscle activation. Mandibular rotation during unilateral molar contact depended on which muscles were activated, and the availability of bilateral condylar support.
机译：问题陈述：无论是否重建颌骨，导致下颌间断的复合型下颌切除术都会改变颌骨运动，咬合力和咀嚼。与这些变化有关的生物力学事件很难在临床上评估，因此，没有得到充分的文献记载或研究。目的：本研究的目的是对具有不连续性缺损的下颌骨的运动进行建模，并将其与通过异体再生重建的具有连续性的下颌骨的运动进行比较。材料与方法：计算模型是使用新型仿真平台创建的。模型中设计的变量包括重力，外力和下颌肌肉活动。在外力或肌肉驱动下张开时，以及在非手术侧产生单侧咬合力时，观察到每个颚都处于静止状态。用弹簧般的力量模拟瘢痕形成。输出包括各个肌肉的力量和扭矩，以及下颌切牙和con运动。结果：两个模型均显示出合理的休息姿势，并且在模拟瘢痕形成时颌开口向着缺损侧偏移。由于在门牙上施加向下的力而导致的张开与由于肌肉激活而引起的张开有所不同。未患侧单侧磨牙接触期间的下颌旋转是肌肉特异性的，并受下颌间断的影响。结论：通过动态建模可以预测下颌下颌切除术和/或同种异体重建术后颌骨运动的合理性。软组织力对颌骨姿势和运动的影响随可用的con突支撑而变化。在这两种模型中，通过颌骨上的外力和颌骨肌肉的激活产生不同的张开轨迹。单侧磨牙接触过程中的下颌旋转取决于激活了哪些肌肉以及双侧con突支持的可用性。

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