【摘要】：背景:種植體的形狀影響其生物力學(xué)表現(xiàn),目前對(duì)種植支持式單端固定橋的研究多在相同形狀種植體進(jìn)行,對(duì)不同形狀種植體支持的單端固定橋的比較分析較少。目的:利用三維有限元建模,分析圓柱形、錐形與膨脹式3種種植體支持的單端固定橋在下頜后牙區(qū)的生物力學(xué)特征。方法:分別建立圓柱形、錐形與膨脹式種植體支持單端固定橋及其支持組織的三維有限元模型,對(duì)單端固定橋軸向90°和頰舌向45°分別施加300 N的力,分析皮質(zhì)骨、松質(zhì)骨的von Mises應(yīng)力及種植體-基臺(tái)復(fù)合體的最大位移。結(jié)果與結(jié)論:①在軸向和頰舌向加載力下,3種模型皮質(zhì)骨的最大應(yīng)力峰值遠(yuǎn)大于松質(zhì)骨,皮質(zhì)骨的最大應(yīng)力峰值均集中于近懸臂種植體遠(yuǎn)中頸部周圍;②膨脹式種植體模型在皮質(zhì)骨中的最大von Mises應(yīng)力值最低,在軸向加載力下尤其明顯,在松質(zhì)骨中的von Mises應(yīng)力值最高;③與軸向加載力比較,頰舌向加載力下3種模型皮質(zhì)骨、松質(zhì)骨的von Mises應(yīng)力峰值及種植體-基臺(tái)復(fù)合體最大位移均增大;在頰舌向加載力下,膨脹式種植體模型的種植體-基臺(tái)復(fù)合體最大位移最小;④結(jié)果表明,膨脹式種植體支持的單端固定橋穩(wěn)定性最好。
[Abstract]:Background: the shape of implants affects their biomechanical performance. At present, most of the researches on implant-supported single-ended fixed bridges are carried out in the same shape implants. Objective: to analyze the biomechanical characteristics of three kinds of implant-supported single-end fixed bridges in the mandibular posterior teeth using three-dimensional finite element modeling. Methods: three dimensional finite element models of cylindrical, conical and expansion implant-supported single-ended fixed bridges and their supporting tissues were established, and the cortical bone was analyzed by applying 300N force to the axial 90 擄and 45 擄buccal and lingual direction of the single-ended implant respectively. Von Mises stress of cancellous bone and maximum displacement of implant-abutment complex. Results and conclusion: 1 under axial and buccal loading, the maximum stress of cortical bone of the three models was much higher than that of cancellous bone, and the maximum stress of cortical bone was concentrated around the distal neck of the proximal cantilever implant. (2) the maximum von Mises stress in cortical bone was the lowest in the expanded implant model, especially in axial loading, and the von Mises stress in cancellous bone was the highest. 3Compared with the axial loading force, the peak von Mises stress of cancellous bone and the maximum displacement of implant-base complex increased in the three model cortical bones under buccal and lingual loading. Under the buccal and lingual loading force, the maximum displacement of the implant-base composite in the expanded implant model is the minimum. 4 the results show that the stability of the single end fixed bridge supported by the expansion implant is the best.
【作者單位】： 哈爾濱醫(yī)科大學(xué)第一附屬醫(yī)院群力院區(qū);
【分類號(hào)】：R783.6

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