本文選題：種植體 + 三維有限元��； 參考：《山西醫(yī)科大學(xué)》2014年碩士論文

【摘要】：目的： 應(yīng)用三維有限元方法，研究在不同牙槽骨骨質(zhì)情況下，后牙單個(gè)種植修復(fù)體咬合接觸面積與種植體直徑范圍不同比例關(guān)系時(shí)，對(duì)種植體及其周圍骨組織應(yīng)力分布的影響，為臨床應(yīng)用中不同牙槽骨骨質(zhì)條件患者提供合理的種植體上部結(jié)構(gòu)設(shè)計(jì)方案及調(diào)牙合提供理論基礎(chǔ)。 方法： 運(yùn)用CBCT掃描技術(shù)獲得6┐缺失患者上下頜牙列及上下頜骨連續(xù)水平的二維斷層圖像。在Mimics10.01軟件中將獲得的二維圖像重建為三維圖像，剪切獲得6┐頜骨骨塊模型，在Solid work2012軟件中依據(jù)咬合曲線、6┐牙冠標(biāo)準(zhǔn)值數(shù)據(jù)及工作數(shù)據(jù)建立牙冠模型，，按照德國XIVE種植體廠商提供的種植體參數(shù)建立種植體模型。在Solid work2012軟件中將下頜骨骨塊、種植體、牙冠組合裝配后完成模型。按照咬合接觸面積分別超出種植體直徑范圍0%、10%、20%、30%、40%分組后，在Solid works軟件中對(duì)種植修復(fù)體牙合面加載負(fù)荷，計(jì)算并分析種植修復(fù)體咬合接觸面積與種植體直徑范圍不同比例時(shí)對(duì)種植體周圍骨組織應(yīng)力分布情況。 結(jié)果： 1.在Mimics10.01軟件中建立了頭面部模型，剪切獲得6┐頜骨骨塊模型；Solid works2012軟件中制作6┐牙冠標(biāo)準(zhǔn)值模型及實(shí)驗(yàn)中的工作模型，以及種植體模型，修整模型，使其具有優(yōu)良的力學(xué)及結(jié)構(gòu)相似性，為下一步的實(shí)驗(yàn)研究奠定基礎(chǔ)。 2.在相同的骨質(zhì)、相同的受力條件下，種植體及周圍骨組織應(yīng)力分布情況走向大致相同：應(yīng)力分布基本集中于種植體頸部周圍的骨皮質(zhì)中，而分布于松質(zhì)骨中的應(yīng)力相應(yīng)減少。 3.在相同的受力條件下，隨著下頜骨骨質(zhì)密度的變化，種植體及周圍骨組織應(yīng)力峰值分布趨勢(shì)：Ⅰ類骨質(zhì)、Ⅱ類骨質(zhì)＜Ⅲ類骨質(zhì)＜Ⅳ類骨質(zhì)。 4.在相同的骨質(zhì)中，不同的受力方式下，種植體及周圍骨組織應(yīng)力分布情況基本一致：斜向集中＞斜向均布＞垂直集中＞垂直均布。 5.在相同骨質(zhì)密度、相同的受力條件下，種植體及周圍骨組織應(yīng)力峰值分布：咬合接觸面積超出種植體直徑范圍0%、20%＜10%＜30%＜40%，但咬合面積超出30%以內(nèi)時(shí)，兩兩比較其應(yīng)力分布值差別無統(tǒng)計(jì)學(xué)意義，而超出種植體直徑范圍40%以后，種植體周圍應(yīng)力值顯著增加，且差別具有統(tǒng)計(jì)學(xué)意義。 結(jié)論： 相同骨質(zhì)及受力條件下，咬合接觸面積大小決定種植體及周圍骨組織應(yīng)力分布，因此，適當(dāng)?shù)囊Ш辖佑|面積是種植體修復(fù)中必須重視的。將種植修復(fù)體牙合面接觸范圍擴(kuò)大到種植體直徑范圍的130%以內(nèi)時(shí)，種植體及周圍骨組織應(yīng)力分布無統(tǒng)計(jì)學(xué)差別，可以為臨床研究提供理論基礎(chǔ)。
[Abstract]:Objective: The effects of occlusal contact area and implant diameter range on stress distribution of implant and its surrounding bone were studied with three-dimensional finite element method (FEM) under different alveolar bone condition and the relationship between occlusal contact area and implant diameter range. It provides a theoretical basis for the reasonable design of implant superstructure and the adjustment of occlusal in patients with different alveolar bone condition in clinical application. Methods: CBCT scan technique was used to obtain 2D images of maxillary dentition and mandibular bone in patients with 6 missing teeth. The 2D image was reconstructed into three dimensional image in Mimics10.01 software, and the 6 jaw bone block model was obtained by cutting. The crown model was established in Solid work2012 software based on the standard value data and working data of the occlusal curve. The implant model was established according to the implant parameters provided by XIVE implant manufacturer in Germany. The mandibular bone block, implant and crown were assembled in Solid work2012 software to complete the model. According to the occlusal contact area, which exceeded the implant diameter respectively, the implant was loaded with a load on the dental surface of the implant in the Solid works software after 40% grouping. The stress distribution of the bone tissue around the implant was calculated and analyzed when the occlusal contact area and the implant diameter range were different. Results: 1. The craniofacial model was established in Mimics10.01 software, and the 6 mandibular bone mass model was obtained. In the solid works2012 software, the standard value model of 6 crowns, the working model in experiment, the implant model and the dressing model were made. It has excellent mechanical and structural similarity, and lays a foundation for further experimental research. 2. Under the same bone and same stress conditions, the stress distribution of implants and surrounding bone tissues is approximately the same: the stress distribution is basically concentrated in the cortex around the implant neck, while the stress distributed in the cancellous bone decreases accordingly. 3. Under the same stress condition, with the change of bone density of mandible, the distribution trend of stress peak in implant and surrounding bone tissue was: class 鈪

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