本文選題：種植義齒　切入點(diǎn)：有限元分析　出處：《北方工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：人體口腔環(huán)境復(fù)雜,種植義齒經(jīng)過長期使用之后容易出現(xiàn)繃瓷等病變,在利用去冠器取下牙冠進(jìn)行二次治療的過程中容易對粘結(jié)面和骨結(jié)合面造成損傷破壞,不同的粘結(jié)修復(fù)材料、不同的粘結(jié)層厚度以及不同的拆卸牙冠作用點(diǎn)都會影響拆卸的效果。目前臨床上對種植系統(tǒng)中牙冠的拆卸更多的是依靠經(jīng)驗,缺乏理論性研究的指導(dǎo),因此研究種植義齒粘結(jié)界面和骨結(jié)合界面在去冠器沖擊載荷作用下的應(yīng)力和變形的分布及峰值大小,從而在種植修復(fù)中合理選擇粘結(jié)材料、粘結(jié)層厚度以及在拆卸牙冠時選擇恰當(dāng)?shù)牟鹦蹲饔命c(diǎn),具有一定的理論指導(dǎo)意義。 通過建立了種植義齒有限元模型,并針對聚羧酸鋅水門汀、玻璃離子水門汀、磷酸鋅水門汀三種粘結(jié)材料以及牙冠上4個不同的載荷作用點(diǎn),設(shè)計了12種工況,利用Workbench中的瞬態(tài)動力學(xué)模塊進(jìn)行仿真計算,得到了粘結(jié)界面和骨結(jié)合界面的應(yīng)力和變形的分布以及峰值的大小。結(jié)果表明：應(yīng)力和變形的分布趨勢與粘結(jié)材料關(guān)系不大,粘結(jié)界面的變形主要分布在粘結(jié)劑和基臺接觸的頂端一圈的位置,骨結(jié)合面的變形主要分布在種植體與骨密質(zhì)接觸的頸部區(qū)域；在牙冠頰側(cè)的兩個不同位置施加沖擊載荷時,粘結(jié)劑頸部肩臺頰側(cè)位置和骨密質(zhì)與種植體形成骨結(jié)合界面的頰側(cè)螺紋接觸位置有應(yīng)力集中現(xiàn)象,為失效風(fēng)險較大的區(qū)域；在牙冠舌側(cè)的兩個不同位置施加沖擊載荷時,粘結(jié)劑頸部肩臺舌側(cè)位置和骨密質(zhì)與種植體形成骨結(jié)合界面的舌側(cè)螺紋接觸位置有應(yīng)力集中現(xiàn)象,為失效風(fēng)險較大的區(qū)域。 通過比較應(yīng)力和變形峰值的大小可以得出：在牙冠4個位置施加載荷時,粘結(jié)劑上的最大拉應(yīng)力都大于相應(yīng)材料的抗拉強(qiáng)度；在牙冠頸部舌側(cè)位置施加沖擊載荷時,對基臺粘結(jié)面和骨結(jié)合面的損傷風(fēng)險最低；磷酸鋅水門汀為粘結(jié)材料時基臺粘結(jié)面上產(chǎn)生的應(yīng)力為27.522MPa,比玻璃離子水門汀和聚羧酸鋅水門汀作為粘結(jié)材料時在基臺粘結(jié)面上產(chǎn)生的應(yīng)力分別高9.6%和14.8%,引起損傷的風(fēng)險稍高。 基于參數(shù)化的種植義齒模型,利用Workbench中的Design Exploration模塊分析了粘結(jié)層厚度在20μm-150μm范圍內(nèi)連續(xù)變化時對粘結(jié)界面和骨結(jié)合界面造成的影響。結(jié)果表明：粘結(jié)層厚度對粘結(jié)界面的變形峰值以及骨結(jié)合面的應(yīng)力與變形峰值影響很��；在粘結(jié)層厚度為50pμm-53μm時,基臺粘結(jié)面損傷風(fēng)險最低,同時在沖擊載荷作用下牙冠能夠正常脫位。 通過以上的仿真研究結(jié)果可以為種植義齒的臨床修復(fù)治療提供參考。
[Abstract]:Human oral cavity environment is complex, implant denture after long-term use is prone to the appearance of porcelain and other pathological changes, in the use of crown remover to remove the crown for secondary treatment of the process is easy to cause damage to the bonding surface and bone bonding surface damage. Different bonding materials, different thickness of bonding layer and different application points of disassembly crown will affect the effect of disassembly. At present, the clinical application of dental crown removal in implant system is more dependent on experience, lack of theoretical research guidance. Therefore, the distribution and peak value of stress and deformation of implant denture bonding interface and bone-bonding interface under impact loading of crown remover were studied, so as to reasonably select bonding materials in implant restoration. The thickness of the adhesive layer and the selection of appropriate disassembly point in the removal of the crown are of theoretical significance. The finite element model of implant denture was established, and 12 working conditions were designed for three kinds of bonding materials, such as polycarboxylate zinc cement, glass ionomer cement and zinc phosphate cement, as well as four different loading points on the crown. By using the transient dynamics module in Workbench, the distribution of stress and deformation and the magnitude of peak value of stress and deformation at bonding interface and bone-bonded interface are obtained. The results show that the distribution trend of stress and deformation is not related to the bonding material. The deformation of the bonding interface was mainly located at the top circle of the contact between the binder and the base, the deformation of the bony joint was mainly distributed in the neck region where the implant was in contact with the dense bone, and when the impact load was applied at two different positions on the buccal side of the crown, At the buccal side of the shoulder abutment of the neck of the binder and the contact position of the bone-dense substance at the buccal side where the implants form a bone-bound interface, there is a stress concentration phenomenon, which is an area with a high risk of failure. When the impact load is applied at two different positions of the crown and tongue side, The stress concentration in the position of the lingual side of the shoulder plate of the binder and the contact position of the bony compaction with the bony thread formed the bone-bound interface between the implants and the implant is a high risk area for failure. By comparing the peak values of stress and deformation, it can be concluded that the maximum tensile stress on the binder is greater than the tensile strength of the corresponding material when applied at the four positions of the crown, and when the impact load is applied on the lingual side of the crown neck, the maximum tensile stress on the binder is greater than the tensile strength of the corresponding material. The damage risk of bond surface and bone joint surface of the base platform was the lowest. When zinc phosphate cement is the bonding material, the stress on the bonding surface is 27.522 MPa, which is 9.6% and 14.8 times higher than that of glass ionomer cement and polycarboxylate zinc cement on the bonding surface of the base, respectively. The risk of damage is slightly higher than that of glass ionomer cement and polycarboxylate zinc cement. Based on parameterized implant denture model, By using the Design Exploration module in Workbench, the influence of the thickness of the bond layer on the bond interface and the bone-bonding interface is analyzed when the thickness of the bond layer changes continuously in the range of 20 渭 m to 150 渭 m. The results show that the thickness of the bond layer affects the peak deformation of the bond interface and the bone interface. The peak value of stress and deformation has little effect; When the thickness of the bonding layer is 50p 渭 m -53 渭 m, the damage risk of the base surface is the lowest, and the crown can dislocate normally under the impact load. The above results can provide reference for the clinical treatment of implant denture.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R783.6

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