平臺轉(zhuǎn)換技術(shù)結(jié)合莫氏錐度連接設(shè)計種植體負(fù)載時的三維有限元分析
發(fā)布時間：2019-03-13 16:11
【摘要】：目的本實驗研究的目的是采用三維有限元分析的方法,通過改變施加于基臺載荷的傾斜角度,研究平臺轉(zhuǎn)換技術(shù)結(jié)合莫氏錐度連接設(shè)計的種植體在負(fù)載條件下種植體、基臺、皮質(zhì)骨和松質(zhì)骨各部分的應(yīng)力分布特點,為種植體-基臺連接結(jié)構(gòu)設(shè)計的優(yōu)化,臨床使用種植體的選擇以及減少種植體臨床并發(fā)癥發(fā)生率提供理論研究參考,從而提高種植體修復(fù)治療的遠(yuǎn)期成功率和臨床滿意度。方法利用三維有限元分析軟件ANSYS Mechanical14.5的建模功能建立1個由種植體、基臺以及頜骨骨塊組成的三維有限元模型。利用軟件的網(wǎng)格劃分功能對種植體、基臺、頜骨骨塊分別進(jìn)行網(wǎng)格劃分,然后將三者裝配在一起。接著對裝配后的模型施加載荷,載荷大小為150N,模擬為頰舌向3個角度的斜向(偏離種植體軸向15°、30°、45°)載荷和1個沿種植體軸向(即0°)的載荷。除了載荷角度不同以外,其余實驗條件均相同,載荷施加模式為集中加載于基臺中央位置。結(jié)果得到了種植體、基臺、皮質(zhì)骨和松質(zhì)骨各部分在不同傾斜角度載荷條件下的應(yīng)力分布云圖。有限元應(yīng)力分析結(jié)果表明:在垂直載荷條件下,種植體、基臺、皮質(zhì)骨和松質(zhì)骨的Von Mises應(yīng)力峰值均最小,隨著載荷傾斜角度的增大,種植體、基臺、皮質(zhì)骨和松質(zhì)骨的Von Mises應(yīng)力峰值均相應(yīng)增大;在種植體軸向載荷及偏離種植體軸向的斜向載荷條件下,種植體和基臺的應(yīng)力集中區(qū)域均出現(xiàn)在兩者相連接的頸部;不論載荷方向為沿種植體長軸還是偏離種植體長軸,種植體和基臺的Von Mises應(yīng)力值峰值均最大,遠(yuǎn)大于種植體周圍皮質(zhì)骨和松質(zhì)骨內(nèi)的Von Mises應(yīng)力峰值;種植體周圍骨組織內(nèi)的應(yīng)力主要分布在皮質(zhì)骨內(nèi),隨著載荷傾斜角度的增大,松質(zhì)骨內(nèi)的Von Mises應(yīng)力峰值位置明顯向種植體根尖部移位。結(jié)論對于平臺轉(zhuǎn)換技術(shù)結(jié)合莫氏錐度連接設(shè)計的種植體來說:側(cè)向載荷會增大種植修復(fù)體結(jié)構(gòu)內(nèi)部和種植體周圍骨組織的應(yīng)力;種植體和基臺相較于種植體周圍的骨組織更易受側(cè)向載荷的影響,種植體和基臺連接處的頸部區(qū)域存在著潛在的變形或者折斷風(fēng)險,屬于種植修復(fù)體中的應(yīng)力危險區(qū)域,應(yīng)注意加強種植體和基臺頸部區(qū)域的強度,同時盡量避免側(cè)向載荷的出現(xiàn);這種種植體-基臺連接設(shè)計可將應(yīng)力限制在種植體結(jié)構(gòu)內(nèi)部,有助于減少傳遞到種植體周圍骨組織內(nèi)的應(yīng)力,減少種植體頸部周圍皮質(zhì)骨內(nèi)的應(yīng)力集中,使皮質(zhì)骨內(nèi)的應(yīng)力分布的更加均勻,從而減少種植體頸部周圍皮質(zhì)骨的吸收,有利于種植體周圍邊緣骨的保存,進(jìn)而有利于種植體周圍軟組織的穩(wěn)定。
[Abstract]:Objective the purpose of this experiment is to use the method of three-dimensional finite element analysis, by changing the tilt angle of the load applied on the abutment, to study the platform conversion technique combined with the Morse taper connection design of the implant under the loading conditions, the implant, the platform, and so on. The stress distribution characteristics of cortical bone and cancellous bone provide theoretical reference for optimizing the design of implant-abutment connection structure, selecting the clinical use of implant and reducing the incidence of clinical complications of implant. In order to improve the long-term success rate and clinical satisfaction of implant repair treatment. Methods A three-dimensional finite element model consisting of implant, abutment and bone mass of jaw was established by using the modeling function of ANSYS Mechanical14.5, a three-dimensional finite element analysis software. The mesh function of the software was used to mesh the implant, the abutment and the bone mass of the jaw, and then the three parts were assembled together. Then a load of 150N was applied to the assembled model, which was simulated as an oblique load (15 擄, 30 擄, 45 擄) along the axial direction of the implant and a load along the axial direction of the implant (that is, 0 擄), which deviated from the axial direction of the implant to 15 擄, 30 擄, 45 擄, and a load along the axial direction of the implant (that is, 0 擄). Except for the different loading angles, the other experimental conditions are the same, and the loading mode is centralized loading at the central position of the abutment. Results the stress profiles of implant, abutment, cortical bone and cancellous bone under different inclined loads were obtained. The results of finite element stress analysis show that the peak value of Von Mises stress in implant, abutment, cortical bone and cancellous bone is the smallest under vertical loading. With the increase of load tilt angle, the implant, abutment, and implant have the lowest peak stress. The peak value of Von Mises stress in cortical bone and cancellous bone increased correspondingly. Under the conditions of axial load and oblique load deviating from the axial direction of the implant, the stress concentration areas of the implant and the abutment appear in the neck of the connection between the implant and the abutment. No matter the load direction is along or off the implant axis, the peak value of Von Mises stress in implant and abutment is the largest, much higher than the peak value of Von Mises stress in cortical bone and cancellous bone around the implant. The stress in the bone tissue around the implant was mainly distributed in the cortical bone. With the increase of load tilt angle, the peak position of Von Mises stress in cancellous bone shifted to the root tip of implant obviously. Conclusion for the implant designed with the platform conversion technique and Morse taper connection, lateral loading will increase the stress of the bone tissue in the implant structure and around the implant. The implant and abutment are more susceptible to lateral loads than the bone around the implant. There is a potential risk of deformation or break in the neck region between the implant and the abutment, belonging to the stress risk area of the implant prosthesis. Attention should be paid to strengthening the strength of the implant and the neck of the abutment, while avoiding lateral loads as much as possible. This implant-base connection design limits stress within the implant structure and helps to reduce stress transfer to the surrounding bone tissue and stress concentration in the cortical bone around the implant neck. The stress distribution in the cortical bone is more uniform so as to reduce the absorption of the cortical bone around the neck of the implant, which is beneficial to the preservation of the marginal bone around the implant and to the stability of the soft tissue around the implant.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R783.6
本文編號：2439550
[Abstract]:Objective the purpose of this experiment is to use the method of three-dimensional finite element analysis, by changing the tilt angle of the load applied on the abutment, to study the platform conversion technique combined with the Morse taper connection design of the implant under the loading conditions, the implant, the platform, and so on. The stress distribution characteristics of cortical bone and cancellous bone provide theoretical reference for optimizing the design of implant-abutment connection structure, selecting the clinical use of implant and reducing the incidence of clinical complications of implant. In order to improve the long-term success rate and clinical satisfaction of implant repair treatment. Methods A three-dimensional finite element model consisting of implant, abutment and bone mass of jaw was established by using the modeling function of ANSYS Mechanical14.5, a three-dimensional finite element analysis software. The mesh function of the software was used to mesh the implant, the abutment and the bone mass of the jaw, and then the three parts were assembled together. Then a load of 150N was applied to the assembled model, which was simulated as an oblique load (15 擄, 30 擄, 45 擄) along the axial direction of the implant and a load along the axial direction of the implant (that is, 0 擄), which deviated from the axial direction of the implant to 15 擄, 30 擄, 45 擄, and a load along the axial direction of the implant (that is, 0 擄). Except for the different loading angles, the other experimental conditions are the same, and the loading mode is centralized loading at the central position of the abutment. Results the stress profiles of implant, abutment, cortical bone and cancellous bone under different inclined loads were obtained. The results of finite element stress analysis show that the peak value of Von Mises stress in implant, abutment, cortical bone and cancellous bone is the smallest under vertical loading. With the increase of load tilt angle, the implant, abutment, and implant have the lowest peak stress. The peak value of Von Mises stress in cortical bone and cancellous bone increased correspondingly. Under the conditions of axial load and oblique load deviating from the axial direction of the implant, the stress concentration areas of the implant and the abutment appear in the neck of the connection between the implant and the abutment. No matter the load direction is along or off the implant axis, the peak value of Von Mises stress in implant and abutment is the largest, much higher than the peak value of Von Mises stress in cortical bone and cancellous bone around the implant. The stress in the bone tissue around the implant was mainly distributed in the cortical bone. With the increase of load tilt angle, the peak position of Von Mises stress in cancellous bone shifted to the root tip of implant obviously. Conclusion for the implant designed with the platform conversion technique and Morse taper connection, lateral loading will increase the stress of the bone tissue in the implant structure and around the implant. The implant and abutment are more susceptible to lateral loads than the bone around the implant. There is a potential risk of deformation or break in the neck region between the implant and the abutment, belonging to the stress risk area of the implant prosthesis. Attention should be paid to strengthening the strength of the implant and the neck of the abutment, while avoiding lateral loads as much as possible. This implant-base connection design limits stress within the implant structure and helps to reduce stress transfer to the surrounding bone tissue and stress concentration in the cortical bone around the implant neck. The stress distribution in the cortical bone is more uniform so as to reduce the absorption of the cortical bone around the neck of the implant, which is beneficial to the preservation of the marginal bone around the implant and to the stability of the soft tissue around the implant.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R783.6
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