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  本文選題：下無牙頜覆蓋義齒 + 雙種植體　； 參考：《鄭州大學》2014年碩士論文

【摘要】：目的 通過構建三種附著體固位的下頜雙種植體覆蓋義齒的體外模型，采用三維有限元分析法，觀察分析附著體類型對下頜覆蓋義齒生物力學性能的影響。 方法 通過對下頜骨進行薄層CT掃描，運用Mimics醫(yī)學建模軟件、GeomagicStudio曲面重建軟件，NX三維建模軟件以及Ansys Workbench三維有限元分析軟件，共生成三個模型—分別為由球帽附著體、locator附著體與桿卡附著體固位的下無牙頜雙種植體覆蓋義齒的三維有限元模型。每個模型均給予100N前牙垂直加載、100N后牙垂直加載和100N后牙斜向加載這三種加載條件，記錄上述三個模型種植體及其周圍皮質骨、黏骨膜的應力分布和義齒基托位移情況，比較使用這三種類型附著體時下頜種植覆蓋義齒的生物力學性能差異。 結果 實驗結果顯示，，在前后牙垂直斜向加載時，三個模型中種植體頸部均有較大的應力集中，尤其是在種植體與附著體基臺連接部位尤為明顯；種植體周圍的皮質骨上也出現(xiàn)應力集中，但其應力值既沒有小于種植體周圍骨沉積所需的最小應力，又沒有超過皮質骨的抗壓極限強度。對于加載條件，相比于垂直加載，斜向加載更容易造成種植體及種植體周圍支持組織較大的應力集中及較大的義齒動度；關于附著體類型，與locator附著體和桿卡附著體相比，球帽附著體更利于減小種植體及其周圍皮質骨的應力，黏骨膜的應力應變和義齒動度較大。 結論 受本實驗方法和條件的限制，可以得出以下結論： 1.下頜雙種植體覆蓋義齒中種植體所受應力均主要集中于種植體頸部，支持組織的應力主要集中于種植體周圍的皮質骨。 2.用不同類型附著體固位的下頜雙種植體覆蓋義齒的應力分布特點不同，與locator附著體、桿卡附著體相比，球帽附著體覆蓋義齒所引起的種植體及其周圍骨組織的應力集中較小。 3.覆蓋義齒在受到側向力時種植體及其周圍骨組織產生較大應力集中，故斜向力比垂直力更易導致骨重建和骨吸收。
[Abstract]:objective
The effect of the type of attachments on the biomechanical properties of mandibular overdentures was observed and analyzed by three-dimensional finite element analysis (3D finite element analysis) by constructing the external model of the denture covering the mandibular double implants with three attachments.
Method
By TLC CT scanning of mandible, using Mimics medical modeling software, GeomagicStudio surface reconstruction software, NX 3D modeling software and Ansys Workbench three-dimensional finite element analysis software, three models are generated, respectively as the ball cap attachment, and the submandibular double implants covering the attachment of the locator attachment and the rod card attachment. The three-dimensional finite element model of the denture. Each model gave the vertical loading of the 100N front teeth, the vertical loading of the 100N posterior teeth and the oblique loading of the 100N back teeth, recorded the three models of the implant and its surrounding cortical bone, the stress distribution of the mucous periosteum and the empathy of the denture base position, and compared the mandibular species when the three types of attachment were used. The difference of biomechanical properties of implant supported denture.
Result
The experimental results show that the stress concentration in the neck of the three models is larger in the vertical oblique loading of the front and rear teeth, especially in the connection parts of the implant and the attachment base, and the stress concentration is also appeared on the cortical bone around the implant, but the stress value is neither less than the minimum required for the bone deposition around the implant. Stress is not more than the compressive ultimate strength of the cortical bone. For loading conditions, the oblique loading is more likely to lead to greater stress concentration and greater denture mobility around the implant and the implant, compared with the vertical loading. As to the attachment type, the ball cap attachment is better than the locator attachment and the rod attachment. The stress of the implant and its surrounding cortical bone is reduced, the stress and strain of the mucosum membrane and the movement of the denture are larger.
conclusion
Due to the limitations of the experimental methods and conditions, the following conclusions can be drawn:
1. the stress in the implant covered denture was mainly concentrated on the neck of the implant, and the stress of the supporting tissue was mainly concentrated on the cortical bone around the implant.
2. the stress distribution of the mandibular double implants covered with different types of attachment is different, and the stress concentration of the implant and the surrounding bone tissue caused by the ball cap attachments is smaller than the locator attachment and the rod card attachment.
3. under the lateral force, the overdenture overlay the implant and its surrounding bone tissue, resulting in greater stress concentration. The oblique force is more likely to cause bone remodeling and bone resorption than vertical force.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：R783.6

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本文編號：2053857