發(fā)布時間：2018-12-06 11:37

【摘要】：目的:利用有限元法探討上頜牙列缺失應用All-on-4修復時種植體在3種牙弓形態(tài)模型中應力分布的差異,為臨床提高種植體成功率提供客觀參數(shù)。方法:參照3M公司MBTTM牙弓模板,應用SolidWorks 2013軟件建立All-on-4種植修復的3種牙弓形態(tài)上頜無牙頜有限元模型(尖圓形、方圓形和卵圓形),設定皮質骨層為2mm,種植體長度為13mm,前牙區(qū)2顆種植體平行植入,后牙區(qū)2顆種植體在頜骨內沿近遠中方向與牙長軸成0°、15°、30°和45°4種角度,所有種植體均固定于上部結構。通過2種加載方式在上部結構施加100N壓力模擬咀嚼受力,應用有限元軟件Abaqus 6.13運算測得種植體在上頜模型的Von-Mises應力值。結果:測得種植體周圍Max von-Mises應力值均出現(xiàn)在皮質骨層,不同牙弓形態(tài)模型中應力分布不同,方圓形牙弓種植體周圍應力隨種植體角度增加而增大;卵圓形牙弓后牙區(qū)最大應力值出現(xiàn)在種植體傾斜15°時,前牙區(qū)應力在種植體傾斜超過15°后明顯提高;尖圓形牙弓種植體周圍應力在種植體傾斜45°時顯著增大。結論:牙弓形態(tài)對種植體周圍應力分布有顯著影響,All-on-4修復上頜牙列缺失時,方圓形牙弓應盡量減少種植傾斜體角度,卵圓形牙弓種植體傾斜角度不宜超過15°,尖圓形牙弓應避免種植體傾斜角度超過30°。
[Abstract]:Objective: to explore the difference of stress distribution in three dental arch models when maxillary dentition was repaired with All-on-4 by using finite element method, and to provide objective parameters for clinical improvement of implant success rate. Methods: according to MBTTM arch template of 3M company, the finite element model of maxillary edentulous maxilla (cusp circle, square round and oval) was established with SolidWorks 2013 software, and the cortical bone layer was set up as 2 mm. The implant was 13mm in length, 2 implants in the anterior tooth region were parallel implanted, and 2 implants in the posterior tooth region were fixed in the upper structure at 4 angles of 0 擄, 15 擄, 30 擄and 45 擄along the proximal and distal direction of the maxilla. The masticatory force was simulated by applying 100N pressure to the superstructure under two loading modes. The Von-Mises stress of the implant in the maxillary model was measured by the finite element software Abaqus 6.13. Results: the stress values of Max von-Mises around the implant appeared in cortical bone layer. The stress distribution was different in different dental arch models. The stress around the implant increased with the increase of implant angle. The maximum stress value of the oval arch posterior region appeared when the implant tilted at 15 擄, the anterior tooth stress increased significantly after the implant tilted more than 15 擄, and the stress around the apical circular arch implant increased significantly when the implant tilted 45 擄. Conclusion: the shape of dental arch has a significant effect on the stress distribution around the implant. When All-on-4 is used to repair maxillary dentition loss, the obliquity angle of the obliquity should be minimized, and the obliquity angle of the oval dental arch implant should not exceed 15 擄. The apical circular arch should avoid the inclination of implant over 30 擄.
【作者單位】： 吉林大學口腔醫(yī)院種植中心;
【基金】：教育部高等學校博士學科點專項科研基金資助課題(20120061110077)
【分類號】：R783.4

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