Division of Plastic, Reconstructive and Aesthetic Surgery, National University Hospital, National University of Singapore, Singapore.
Laryngoscope. 2010 Aug;120(8):1508-15. doi: 10.1002/lary.20976.
OBJECTIVES/HYPOTHESIS: A septal L-strut is often preserved or created during septoplasty. The main intention is to provide structural stability and to straighten the nasal septum. Deformity or excessive deformation of the L-strut might cause functional or aesthetic complications. The objectives were to examine the effects of material properties, the boundary conditions, the nasal tip support, and the geometry of the L-struts on the deformity of septal L-struts.
Computer-aided modeling was used to create a spring-supported nasal tip and free nasal tip L strut septal cartilage models upon which simulation was performed to analyse the deformation patterns.
A five-sided septum model was first created from the computed tomography scan of a human subject. Several models with various combinations of wider or narrower dorsal struts as well as arc of cartilage were then constructed from this septum model. The edges connected to bony supports were assumed to be fixed, and the nasal tip was assumed to be spring supported. Finite element analyses were carried out to determine the deformation and stress distribution in the septal strut for different combinations of material properties and nasal tip spring support.
The spring-supported nasal tip model provides a more accurate representation of the boundary conditions in the nose. In both the free and spring-supported nasal tips-the BC junction and the nasal spine are found to be the consistent points of maximum stress regardless of material properties. The preservation of an arc of cartilage and a wider dorsal strut increase the stability of the structure.
The introduction of a spring-supported nasal tip model provided a more accurate representation of the boundary conditions in the nose. The bony-cartilaginous junction and the nasal spine were found to be the consistent points of maximum stress, regardless of material properties. The preservation of an arc of cartilage and a wider dorsal strut increased the stability of the structure.
目的/假设：鼻中隔 L 型支撑物通常在鼻中隔成形术中保留或创建。其主要目的是提供结构稳定性并使鼻中隔变直。L 型支撑物的变形或过度变形可能导致功能或美学并发症。本研究旨在研究材料特性、边界条件、鼻尖支撑和 L 型支撑物的几何形状对鼻中隔 L 型支撑物变形的影响。
使用计算机辅助建模创建了一个弹簧支撑的鼻尖和自由鼻尖 L 型支撑鼻中隔软骨模型，并对其进行了模拟分析变形模式。
首先从人体的计算机断层扫描创建一个五边形鼻中隔模型。然后，从该鼻中隔模型构建了几个具有不同宽度或更窄的背侧支撑物以及软骨弧度的模型。连接到骨性支撑的边缘被假设为固定的，鼻尖被假设为弹簧支撑。进行有限元分析以确定不同材料特性和鼻尖弹簧支撑组合下鼻中隔支撑物的变形和应力分布。
弹簧支撑的鼻尖模型提供了对鼻腔边界条件更准确的表示。在自由鼻尖和弹簧支撑鼻尖中，无论材料特性如何，BC 交界处和鼻突都被发现是最大应力的一致点。保留软骨弧和更宽的背侧支撑物增加了结构的稳定性。
引入弹簧支撑的鼻尖模型提供了对鼻腔边界条件更准确的表示。无论材料特性如何，骨性-软骨交界处和鼻突都被发现是最大应力的一致点。保留软骨弧和更宽的背侧支撑物增加了结构的稳定性。
