Abstract：
The parasymphysis area of the mandible is highly dynamic because it is subjected to both occlusal and muscular forces. As a result, the fractures in this transition zone have a special pattern, posing a challenge for surgeons whether to use one miniplate versus two miniplates, as per Champy\'s recommendations. The commonest complication resulting to treat this area is mental nerve paraesthesia due to the dissection and stretching of the nerve. Hence, an in vitro research study of a newly designed \'Zeta\' miniplate is performed, to evaluate the biomechanical behaviour using finite element (FE) analysis and biomechanical analysis along with a comparison study with the conventional miniplate configurations. The results showed that the Zeta miniplate produces the lowest stresses 17.511 MPa and the least total structural deformation of 0.0011 mm after applying the maximum occlusal bite force. On application of torsional load, total structural deformation was 0.0004 mm and von Mises (VM) stress value was 0.24 MPa which was lowest when compared with the two miniplate system. Hence, the newly developed Zeta miniplate is superior in terms of stability. Another benefit of its design is that it helps in preventing mental nerve paraesthesia and tooth root damage while fixing and stabilising the fractured bony segments.
摘要：
下颌骨的旁肌区域高度动态，因为它同时受到咬合力和肌肉力的作用。因此,这个过渡带的裂缝有一个特殊的模式，对于外科医生来说，是否使用一个微型板还是两个微型板是一个挑战，根据Champy的建议。由于神经的解剖和拉伸，导致治疗该区域的最常见并发症是精神神经感觉异常。因此，对新设计的“Zeta”微型板进行了一项体外研究，使用有限元（FE）分析和生物力学分析以及与常规微型板配置的比较研究来评估生物力学行为。结果表明，在施加最大咬合咬合力后，Zeta微型板产生的应力最低为17.511MPa，总结构变形最小为0.0011mm。在施加扭转载荷时，总结构变形为0.0004mm，vonMises（VM）应力值为0.24MPa，与两个微型板系统相比最低。因此，新开发的Zeta微型板在稳定性方面优越。其设计的另一个好处是，它有助于防止精神神经感觉异常和牙根损伤，同时固定和稳定骨折的骨节。
