本文選題：正畸弓絲 + 形狀記憶聚合物�。� 參考：《浙江工業(yè)大學》2014年碩士論文

【摘要】：口腔正畸中,固定矯治器常用的金屬鎳鈦弓絲會釋放鎳離子,可能引起過敏,同時矯治力釋放較快。針對這一問題,提出一種聚氨酯形狀記憶聚合物弓絲。形狀記憶聚合物(SMP, Shape memory polymer)材料與形狀記憶合金(SMA, Shape memory Alloy)材料相比具有很多優(yōu)點：耐腐蝕、形變量大、無色、良好的生物相容性,以及形狀記憶恢復溫度可在很大范圍內(nèi)調(diào)節(jié)。另外該材料容易成型,很方便通過注射、擠壓、涂覆等方法成型得到所需要的特殊形狀。本文主要采用實驗和仿真相結(jié)合的方法,研究SMP粘彈性對其正畸弓絲彈性回復力影響,探究其初步應用于正畸矯正弓絲的可行性,所做的工作主要如下：首先通過擠出成型的方法加工出聚合物弓絲,然后進行拉伸實驗,并對應力-應變曲線進行擬合,得到該弓絲不同溫度下的彈性模量和粘性系數(shù),構(gòu)建材料參數(shù)與溫度之間的關(guān)系。在此基礎上,將現(xiàn)有SMP只能描述簡單受力狀態(tài)的一維熱力學本構(gòu)方程,拓展到三維形式,基于ABAQUS的二次開發(fā)功能,對聚合物弓絲進行拉伸形變,并對聚合物弓絲完整的形狀記憶過程和形狀記憶性能進行了仿真分析。結(jié)果表明：在不同的應變條件下,形狀固定率接近80%；加熱過程中應變完全回復；弓絲應力隨著溫度的升高而減小,具有良好的形狀記憶性能,直徑為0.5mm弓絲回復力的大小在65g-120g范圍內(nèi)。然后,通過實驗和仿真的方法研究了SMP粘彈性對其正畸弓絲彈性回復力的影響并對結(jié)果進行了分析。通過分析正畸弓絲在口腔中的約束并進行簡化,對聚合物弓絲進行了三點彎曲實驗、簡支梁和懸臂梁實驗；為探究其緩慢釋放正畸力的性能進行了應力松弛實驗；并在typodont正畸模擬牙頜架上進行了正畸效果的驗證。結(jié)果表明：由于聚合物弓絲具有粘彈性,在簡支梁和懸臂梁實驗中,發(fā)現(xiàn)只有在小變形范圍內(nèi),聚氨酯SMP弓絲的撓度變形曲線符合標準彈性桿的撓度方程；通過三點彎曲實驗得到的加載和卸載應力-應變曲線,發(fā)現(xiàn)由于粘彈性作用,聚氨酯SMP弓絲彈性回復力能夠緩慢釋放具有力學穩(wěn)定性;而應力松弛實驗則反映了在粘彈性作用下,聚氨酯SMP弓絲具有良好的緩慢釋放正畸力的性能；在typodont模型上正畸驗證實驗結(jié)果也比較理想。因此,聚氨酯SMP弓絲具有應用于正畸矯治的前景。
[Abstract]:In this paper , the effect of elastic restoring force on the orthodontic arch wire is studied by means of extrusion molding , and the relationship between the elastic modulus and the temperature of the shape memory alloy is studied .
the strain is fully recovered during the heating process ;
The effects of SMP viscoelasticity on the elastic restoring force of orthodontic archwire in the range of 65 g - 120 g were studied by means of experiments and simulation .
The stress relaxation experiment was carried out to investigate the performance of slow release of orthodontic force .
The results show that the deflection deformation curve of the polyurethane SMP arch wire conforms to the deflection equation of the standard elastic rod only in the small deformation range due to the viscoelasticity of the polymer arch wire .
Through three - point bending experiment , the stress - strain curve is loaded and unloaded , and it is found that the elastic restoring force of the polyurethane SMP arch wire can release the mechanical stability slowly due to the viscoelastic effect , and the stress relaxation experiment shows that the polyurethane SMP arch wire has good properties of slowly releasing the orthodontic force under the action of viscoelasticity ;
The results of the orthodontic verification experiment are also ideal in the orthodontic treatment model . Therefore , the polyurethane SMP arch wire has the prospect of being applied to orthodontic treatment .

【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：R783.5
，

本文編號：1876885