【摘要】：目的:研究種植支持可摘局部義齒修復(fù)下頜遠(yuǎn)中游離端缺失的應(yīng)力分布,探討附著體類型對(duì)于種植體、各支持組織、義齒以及附著體的應(yīng)力影響。方法:建立可摘局部義齒修復(fù)下頜雙側(cè)前磨牙和磨牙缺失的KennedyⅠ類牙列缺損的三維有限元模型,分別為采用傳統(tǒng)可摘局部義齒(無(wú)種植體)、種植體+Locator附著體+可摘局部義齒、種植體+Magfit磁性附著體+可摘局部義齒進(jìn)行修復(fù)。分析對(duì)比各主要成分的應(yīng)力分布,得到最大von Mises應(yīng)力值和位移值。結(jié)果:建立含有牙體組織、牙周組織以及種植體、附著體、可摘局部義齒的三維有限元模型。有種植體的模型義齒基托下黏骨膜的最大位移量(Locator模型垂直向載荷9.38μm、斜向載荷45.48μm,Magfit模型垂直向載荷9.54μm、斜向載荷39.45μm)小于沒有種植體的RPD(removable partial dentures)模型(模型垂直向載荷95.27μm,斜向155.70μm)。Locator和Magfit兩種類型的附著體相比較,Locator模型中種植體頸部周圍皮質(zhì)骨的最大應(yīng)力值大于Magfit模型(Locator模型垂直向載荷10.850 MPa、斜向載荷43.760 MPa,Magfit模型垂直向載荷7.100 MPa、斜向載荷19.260 MPa)。Magfit模型中末端基牙的牙周膜受力更小(Locator模型垂直向載荷0.520MPa,Magfit模型垂直向載荷0.420 MPa)。結(jié)論:在修復(fù)下頜KennedyⅠ類牙列缺損時(shí),種植支持可摘局部義齒可減少對(duì)末端基牙的扭力,提高義齒穩(wěn)定性;Locator和Magfit磁性附著體兩者對(duì)比,Locator附著體水平約束作用更大。
[Abstract]:Objective: to study the stress distribution of removable partial dentures in the restoration of mandibular distal free end, and to explore the effect of attachment type on the stress of implant, supporting tissue, denture and attachment. Methods: three dimensional finite element models were established for the restoration of Kennedy class I dentition defects in mandibular premolars and molars with removable partial dentures. The models were: traditional removable partial dentures (without implants) and implants Locator attachments removable partial dentures. The implant Magfit magnetic attachment is removable partial denture for restoration. The maximum von Mises stress value and displacement value are obtained by analyzing and comparing the stress distribution of the main components. Results: a three dimensional finite element model with dental tissue, periodontal tissue, implants, attachments and removable partial dentures was established. The maximum displacement of the mucous periosteum under the denture base (the vertical load is 9.38 渭 m, the oblique load is 45.48 渭 m, the vertical load is 9.54 渭 m, the oblique load is 39.45 渭 m) is lower than that in the model without implant (the vertical load is 95.27 渭 m). Comparison of oblique 155.70 渭 m) .Locator and Magfit attachment the maximum stress value of cortical bone around implant neck in Locator model is larger than that in Magfit model (vertical load 10.850 MPA, oblique load 43.760 MPA Magfit model 7.100 MPA, oblique load 7.100 MPA) The stress of periodontal ligament of the end abutment in the Magfit model was less (the vertical load of the model was 0.520 MPA) and the vertical load of the Magfit model was 0.420 MPA. Conclusion: in the restoration of mandibular Kennedy 鈪，

本文編號(hào)：2137170