【摘要】：目的 針對扁形根管的前磨牙，通過三維有限元的方法分析在纖維樁主樁與輔樁聯(lián)合應(yīng)用和只應(yīng)用纖維樁主樁的情況下，牙體和修復(fù)體上的應(yīng)力大小及分布情況，為優(yōu)化扁形根管的前磨牙樁核冠修復(fù)體的設(shè)計提供理論參考。 方法 1.根據(jù)王惠蕓報道數(shù)據(jù)，選擇離體的正常下頜第一前磨牙19顆，應(yīng)用CBCT垂直牙體長軸進行掃描，層厚0.1mm，獲取斷層圖像358張。根據(jù)三維影像，再從這19顆中選取扁形單根管的下頜第一前磨牙一顆，按標(biāo)準(zhǔn)根管治療程序及樁道預(yù)備方法預(yù)備此牙，目的是為了獲得接近臨床實際的樁道，此后以與第一次同樣的條件再次進行CBCT掃描。 2.圖像經(jīng)Mimics、Geomagic studio、CATIA、ANSYS Workbench軟件處理，建立只應(yīng)用纖維樁主樁的樁核冠修復(fù)體的分析模型A與樁道內(nèi)聯(lián)合應(yīng)用纖維樁主樁和輔樁的分析模型B。 3.在所建立的三維分析模型的基礎(chǔ)上，利用ANSYS Workbench軟件計算下頜第一前磨在兩種不同形式樁核冠修復(fù)方式下的應(yīng)力情況，最后根據(jù)牙體和修復(fù)體上的應(yīng)力大小及分布情況進行分析。 結(jié)果 1.通過計算機輔助設(shè)計，建立了僅應(yīng)用纖維樁主樁的樁核冠修復(fù)體三維有限元模型A與纖維樁主樁與輔樁聯(lián)合應(yīng)用的樁核冠修復(fù)體三維有限元模型B。 2.主樁與輔樁聯(lián)合應(yīng)用與只應(yīng)用主樁相比較，各種加載角度下，牙體組織上的等效應(yīng)力與最大主應(yīng)力峰值雖然略有降低，但沒有明顯差異，主樁與輔樁聯(lián)合應(yīng)用時牙體組織上高應(yīng)力區(qū)范圍略有減小，應(yīng)力的分布也更趨向均勻。 3.主樁與輔樁聯(lián)合應(yīng)用與只應(yīng)用主樁相比較，當(dāng)應(yīng)力與牙體長軸成角度加載時，樁上的等效應(yīng)力與最大主應(yīng)力峰值呈減小趨勢，且樁上的應(yīng)力變化較牙體組織上大。 4.樹脂上的剪切應(yīng)力主要集中于樁尖的部位，在同種加載角度下，模型A與B中樹脂上剪切力值相差不大，同一模型在不同加載角度下，剪切力峰值隨著加載角度的增加明顯增大。 5.同一模型中，隨著加載角度的增大牙體組織上的等效應(yīng)力峰值和應(yīng)力集中區(qū)域也隨之增大，且增幅較為明顯。 結(jié)論 1.主樁與輔樁聯(lián)合應(yīng)用與只應(yīng)用主樁相比較，載荷與牙體長軸成角度加載的情況下，牙體組織上和樁上的等效應(yīng)力與最大主應(yīng)力峰值略有降低，高應(yīng)力區(qū)范圍略有減小，應(yīng)力的分布也更趨向均勻，但差別并不明顯。表明纖維樁輔樁對扁形根管的前磨牙應(yīng)力的影響不顯著。 2.無論是否使用纖維樁輔樁，牙根上的高應(yīng)力區(qū)域均集中于頸1/3。隨著應(yīng)力與牙體長軸加載角度的增大，模型A與B牙體組織上應(yīng)力均呈明顯增大的趨勢，90°加載時可對修復(fù)體造成破壞性的影響。 3.相比較纖維樁輔樁對修復(fù)體應(yīng)力的影響來說，，加載角度的影響更大。
[Abstract]:Objective to analyze the stress distribution and stress distribution of the flat root canal premolars in the case of fiber pile and auxiliary pile combined with fiber pile and only fiber post. It provides a theoretical reference for optimizing the design of premolar post-core crown prosthesis with flat root canal. Method 1. According to the data reported by Wang Huiyun 19 normal mandibular first premolars were selected and scanned with CBCT vertical long axis. The slice thickness was 0.1 mm and the tomographic images were obtained. According to the 3D images, one of the first mandibular premolars of the flattened single root canal was selected and prepared according to the standard root canal treatment procedure and the method of the post canal preparation, in order to obtain a post canal close to the clinical reality. The CBCT scan is then performed again under the same conditions as the first time. 2. The image was processed by Mimics,Geomagic studio,CATIA,ANSYS Workbench software, and the analysis model of the crown restoration with only fiber pile was established. Model A was combined with the analysis model of fiber pile main pile and auxiliary pile in pile road. On the basis of the established three-dimensional analysis model, the stress of mandibular first anterior grinding under two different forms of post and core crown restoration was calculated by ANSYS Workbench software. Finally, the stress distribution and size of tooth and prosthesis were analyzed. Result 1. By means of computer aided design, a three-dimensional finite element model B. 2, which is used only for fiber pile main pile and auxiliary pile, is established. Compared with the application of main pile and auxiliary pile, the equivalent stress and the peak value of maximum principal stress in dental tissue decreased slightly, but there was no significant difference between them. The range of high stress zone in dental tissue decreases slightly and the distribution of stress tends to be more uniform when combined with main pile and auxiliary pile. 3. When the stress is loaded at an angle to the long axis of the tooth, the equivalent stress and the peak value of the maximum principal stress on the pile tend to decrease, and the change of the stress on the pile is larger than that on the tooth. 4. The shear stress on the resin is mainly concentrated on the tip of the pile. At the same loading angle, the shear stress on the resin in model A and B is not different, and the shear stress on the same model is at different loading angles. The peak value of shear force increases obviously with the increase of loading angle. 5. In the same model, the peak value of equivalent stress and the region of stress concentration increase with the increase of loading angle, and the increase is obvious. Conclusion 1. When combined application of main pile and auxiliary pile is compared with only main pile, the equivalent stress and peak value of maximum principal stress decrease slightly, and the range of high stress region decreases slightly when the load is angular to the long axis of the tooth. The stress distribution tends to be more uniform, but the difference is not obvious. The results showed that the stress of premolar of flat root canal was not significantly affected by fiber pile. 2. Whether or not the fiber pile was used, the high stress area on the root was concentrated on the neck 1 / 3. With the increase of stress and long axis loading angle of tooth, the stress on model A and B tooth tissue is obviously increasing, and 90 擄loading can have a destructive effect on the restoration. 3. Compared with the effect of fiber pile auxiliary pile on the stress of the restoration, the effect of loading angle is greater.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R783.3

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