纖維樁修復(fù)不同形態(tài)上頜尖牙根管有限元分析及其3D打印技術(shù)研究
發(fā)布時間：2019-06-03 08:30
【摘要】：目的利用三維有限元分析方法對纖維樁修復(fù)正常形態(tài)和漏斗狀根管上頜尖牙進行動力學(xué)和疲勞失效機理分析,揭示修復(fù)后牙齒在使用過程中發(fā)生疲勞失效的機制,為臨床上纖維樁修復(fù)后牙齒的壽命預(yù)測和抗疲勞性的提升提供理論基礎(chǔ)。在此基礎(chǔ)上,利用3D打印技術(shù)定制不同形態(tài)根管樁核冠修復(fù)后牙齒各部分應(yīng)力分布狀況,為其在臨床的修復(fù)應(yīng)用提供理論依據(jù)。方法1.基于三坐標(biāo)測量機對牙齒模型進行掃描獲得牙齒的點云數(shù)據(jù),利用逆向工程軟件Geomagic Studio對點云數(shù)據(jù)進行重構(gòu),再利NX UG軟件的CAD模塊建立修復(fù)體三維模型。2.利用預(yù)成纖維樁分別對正常形態(tài)根管和漏斗形態(tài)根管的牙體進行修復(fù),基于三維有限元法分析修復(fù)后牙體的應(yīng)力—應(yīng)變情況,并基于SWT疲勞壽命分析準(zhǔn)則對修復(fù)后牙體進行疲勞壽命預(yù)測。3.利用3D打印纖維樁和預(yù)成纖維樁分別對正常形態(tài)根管和漏斗形態(tài)根管牙體進行修復(fù),并基于三維有限元法分析并比較兩種系統(tǒng)修復(fù)不同形態(tài)根管牙齒后牙根及樁核的應(yīng)力情況。結(jié)果1.利用纖維樁修復(fù)正常形態(tài)根管牙齒的抗疲勞性能優(yōu)于漏斗狀根管,牙齒最初發(fā)生疲勞損傷的位置與最大主應(yīng)力位置相同,疲勞安全系數(shù)臨界線與修復(fù)后牙齒的橫折線重合,在最大應(yīng)變下載荷的垂線延伸線與修復(fù)后牙齒的斜折線重合。2.對于正常形態(tài)根管,3D打印個性化樁核系統(tǒng)的樁應(yīng)力分布優(yōu)于預(yù)成纖維樁系統(tǒng),能夠有效降低粘合劑的失效概率;對于漏斗形態(tài)根管,3D打印個性化樁核系統(tǒng)修復(fù)后牙根應(yīng)力分布明顯優(yōu)于預(yù)成纖維樁系統(tǒng),能夠有效提高牙齒的抗折性。結(jié)論1.利用纖維樁修復(fù)正常形態(tài)根管牙齒的使用壽命高于漏斗形根管;纖維樁修復(fù)牙齒的最大主應(yīng)力所在區(qū)域即為牙齒疲勞易損傷區(qū)域;纖維樁修復(fù)牙齒的疲勞失效是疲勞結(jié)構(gòu)性破壞和疲勞裂紋擴展的綜合結(jié)果,橫折和斜折的發(fā)生概率在不同使用情況下也不相同。2.無論正常形態(tài)根管還是漏斗型根管,3D打印個性化樁核對牙體的修復(fù)效果均優(yōu)于預(yù)成樁核系統(tǒng)。
[Abstract]:Objective to analyze the dynamics and fatigue failure mechanism of maxillary canines repaired with fiber post in normal morphology and funnel root canal by three-dimensional finite element analysis, and to reveal the mechanism of fatigue failure in the process of restoration. It provides a theoretical basis for the prediction of tooth life and the improvement of fatigue resistance after fiber post repair. On this basis, 3D printing technology was used to customize the stress distribution of each part of teeth after root canal post and core crown restoration, which provided a theoretical basis for its clinical application. Method 1. Based on the coordinate measuring machine, the point cloud data of the tooth model are obtained by scanning the tooth model. The point cloud data are reconstructed by using the reverse engineering software Geomagic Studio, and then the three-dimensional model of the restoration body is established by the CAD module of the NX UG software. 2. The teeth with normal root canal and funnel root canal were repaired by preformed fiber post, and the stress-strain of the restored teeth was analyzed based on three-dimensional finite element method. Based on the SWT fatigue life analysis criterion, the fatigue life of the repaired teeth was predicted. 3D printed fiber post and preformed fiber post were used to repair the root canal teeth with normal root canal and funnel shape, respectively. based on the three-dimensional finite element method, the stress of the root and post core of the two systems were analyzed and compared. Result 1. The fatigue resistance of normal root canal teeth repaired with fiber post is better than that of funnel root canal. the position of initial fatigue damage of teeth is the same as that of maximum principal stress, and the critical line of fatigue safety factor coincides with the transverse line of teeth after restoration. The vertical extension line of the load at the maximum strain coincides with the oblique line of the repaired tooth. 2. For the normal root canal, the stress distribution of 3D printing personalized post-core system is better than that of pre-fiber pile system, which can effectively reduce the failure probability of adhesive. For funnel root canals, 3D printing personalized post-core system is superior to prefibrillated post system in root stress distribution, which can effectively improve the bending resistance of teeth. Conclusion 1. The service life of using fiber post to repair normal root canal teeth is longer than that of funnel root canal, and the area where the maximum principal stress of fiber post is used to repair teeth is the area of fatigue and injury of teeth, and the service life of root canal teeth with fiber post is higher than that of funnel root canal. The fatigue failure of fiber post in tooth repair is the comprehensive result of fatigue structural failure and fatigue crack propagation, and the occurrence probability of transverse fracture and oblique fracture is different under different conditions. 2. Whether the normal root canal or funnel root canal, the effect of 3D printing personalized post and core on tooth restoration is better than that of pre-formed post and core system.
【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】：2017
【分類號】：R783.3
[Abstract]:Objective to analyze the dynamics and fatigue failure mechanism of maxillary canines repaired with fiber post in normal morphology and funnel root canal by three-dimensional finite element analysis, and to reveal the mechanism of fatigue failure in the process of restoration. It provides a theoretical basis for the prediction of tooth life and the improvement of fatigue resistance after fiber post repair. On this basis, 3D printing technology was used to customize the stress distribution of each part of teeth after root canal post and core crown restoration, which provided a theoretical basis for its clinical application. Method 1. Based on the coordinate measuring machine, the point cloud data of the tooth model are obtained by scanning the tooth model. The point cloud data are reconstructed by using the reverse engineering software Geomagic Studio, and then the three-dimensional model of the restoration body is established by the CAD module of the NX UG software. 2. The teeth with normal root canal and funnel root canal were repaired by preformed fiber post, and the stress-strain of the restored teeth was analyzed based on three-dimensional finite element method. Based on the SWT fatigue life analysis criterion, the fatigue life of the repaired teeth was predicted. 3D printed fiber post and preformed fiber post were used to repair the root canal teeth with normal root canal and funnel shape, respectively. based on the three-dimensional finite element method, the stress of the root and post core of the two systems were analyzed and compared. Result 1. The fatigue resistance of normal root canal teeth repaired with fiber post is better than that of funnel root canal. the position of initial fatigue damage of teeth is the same as that of maximum principal stress, and the critical line of fatigue safety factor coincides with the transverse line of teeth after restoration. The vertical extension line of the load at the maximum strain coincides with the oblique line of the repaired tooth. 2. For the normal root canal, the stress distribution of 3D printing personalized post-core system is better than that of pre-fiber pile system, which can effectively reduce the failure probability of adhesive. For funnel root canals, 3D printing personalized post-core system is superior to prefibrillated post system in root stress distribution, which can effectively improve the bending resistance of teeth. Conclusion 1. The service life of using fiber post to repair normal root canal teeth is longer than that of funnel root canal, and the area where the maximum principal stress of fiber post is used to repair teeth is the area of fatigue and injury of teeth, and the service life of root canal teeth with fiber post is higher than that of funnel root canal. The fatigue failure of fiber post in tooth repair is the comprehensive result of fatigue structural failure and fatigue crack propagation, and the occurrence probability of transverse fracture and oblique fracture is different under different conditions. 2. Whether the normal root canal or funnel root canal, the effect of 3D printing personalized post and core on tooth restoration is better than that of pre-formed post and core system.
【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】：2017
【分類號】：R783.3
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