【摘要】：目的設計兩種種植體支持式下頜半口全牙列固定義齒,研究在不同下頜骨垂直高度降低情況下種植體應力分布情況。方法利用錐束計算機斷層掃描成像(CBCT)掃描下頜骨及上部義齒,形成下頜骨基準模型,將基準模型中下頜骨垂直高度分別下降0、5、10和15mm,組裝種植體后,建立頦孔前6枚平行種植體支持和"All-on-four"支持的不同下頜骨垂直高度的種植體有限元模型,分別為6-種植體模型和4-種植體模型,共兩組(8個)。在右下頜第一磨牙中央窩靜態(tài)加載250N垂直力,用Ansys 15.0軟件進行模型各部分的應力分析。結果在相同的加載條件下,種植體最大應力值位于頸部;兩組8個模型最大應力值分布顯示,不同下頜骨垂直高度下4-種植體組的最大應力值在40.12~49.06 MPa之間,6-種植體組的最大應力值在80.62~109.64MPa之間;6-種植體組的最大應力值是4-種植體組的2倍。兩組模型中種植體最大應力在下頜骨垂直高度降低5mm時均表現(xiàn)為最低,隨著下頜骨垂直高度降低,應力逐漸增大,而垂直高度下降0mm的模型最大應力要略大于下降5mm模型。結論 4-種植體和6-種植體支持的無牙頜固定義齒在相對極端的載荷下種植體都沒有出現(xiàn)破壞性應力,4-種植體有著更加合理的應力分布;下頜骨垂直高度下降5mm組應力最小,說明適當降低垂直高度有利于種植體應力更加合理的分布。
[Abstract]:Objective to design two kinds of implant-supported mandibular full dentures and to study the stress distribution of the implants under different mandibular vertical height reduction. Methods the mandibular reference model was established by using cone-beam computed tomography (CBCT) to scan the mandible and the upper denture. The vertical height of the mandible in the reference model was reduced by 0 ~ 5 ~ 10 mm and 15 mm, respectively, and the implant was assembled. The finite element models of different mandibular vertical height supported by six parallel implants and "All-on-four" were established, which were 6-implant model and 4-implant model respectively, two groups (8). The vertical force of 250N was statically loaded in the central fossa of the right first molar, and the stress of each part of the model was analyzed by Ansys 15.0 software. Results under the same loading conditions, the maximum stress value of the implant was located in the neck, and the distribution of the maximum stress value of the two groups of 8 models showed that, The maximum stress values of the 4- implant group at different mandibular vertical heights were between 40.12 and 49.06 MPA and the maximum stress values of the 6-implant group were between 80.62 and 109.64 MPA, and the maximum stress values in the 4-implant group were twice as high as those in the 4-implant group. In the two groups of models, the maximum implant stress was the lowest when the vertical height of mandible decreased 5mm. With the decrease of vertical height of mandible, the stress gradually increased, and the maximum stress of the model with vertical height decreasing 0mm was slightly larger than that of 5mm model. Conclusion neither 4-implant nor 6-implant supported edentulous fixed denture has more reasonable stress distribution under relatively extreme loads, and the lower mandibular vertical height is the smallest in 5mm group. It shows that proper reduction of vertical height is beneficial to more reasonable distribution of implant stress.
【作者單位】： 第二軍醫(yī)大學長海醫(yī)院口腔科;上海交通大學醫(yī)學院附屬新華醫(yī)院口腔科;同濟大學生命科學與技術學院;
【基金】：上海市科學技術委員會科研計劃項目(12ZR1438400)~~
【分類號】：R783.6

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