PDF(Pubmed)
Abstract：
UNASSIGNED: The aim of this study was to assess the stress distribution of the zygomatic implants in maxillectomy cases and to understand the long-term prognosis of this rehabilitation option using finite element analysis.
UNASSIGNED: A three-dimensional finite element model was designed using computed tomography of a patient who underwent maxillectomy post-mucormycosis. Zygomatic implants and abutments were designed based on the manufacturer\'s design. Quad zygomatic implants were placed in the canine and premolar region into the zygomatic bone bilaterally. A prosthesis with an entire complement of teeth extending from the first molar teeth bilaterally was designed and attached to the multiunit abutments and zygomatic implants. Forces were applied to the zygomatic implants at six different locations bilaterally on the prosthesis which included occlusal and laterally directed forces on the central incisor region, canine region, and molar region using von Mises criteria. A three-dimensional finite element analysis was run, and maximum stress distribution was recorded at various loads. Statistical Package for Social Sciences for Windows version 22.0 Released 2013. Armonk, NY: IBM Corp., was used to perform statistical analyses. Kruskal-Wallis test was used to compare the mean stress values. Multiple comparisons of mean difference in stress values between force applications in implant were done using Dunn\'s post hoc test.
UNASSIGNED: The maximum stress was observed at the distal head of the implant in the models. Minimum stress was observed at the apex of the implant in the models. The mean stress values based on force application in the bone and fixed prosthesis showed less significance when compared to the zygomatic implants which was statistically significant at p = 0.03.
UNASSIGNED: A three-dimensional finite element model was designed using computed tomography of a patient who underwent maxillectomy post-mucormycosis. Zygomatic implants and abutments were designed based on the manufacturer\'s design. Quad zygomatic implants were placed in the canine and premolar region into the zygomatic bone bilaterally. A prosthesis with an entire complement of teeth extending from the first molar teeth bilaterally was designed and attached to the multiunit abutments and zygomatic implants. Forces were applied to the zygomatic implants at six different locations bilaterally on the prosthesis which included occlusal and laterally directed forces on the central incisor region, canine region, and molar region using von Mises criteria. A three-dimensional finite element analysis was run, and maximum stress distribution was recorded at various loads. Statistical Package for Social Sciences for Windows version 22.0 Released 2013. Armonk, NY: IBM Corp., was used to perform statistical analyses. Kruskal-Wallis test was used to compare the mean stress values. Multiple comparisons of mean difference in stress values between force applications in implant were done using Dunn\'s post hoc test.
UNASSIGNED: The maximum stress was observed at the distal head of the implant in the models. Minimum stress was observed at the apex of the implant in the models. The mean stress values based on force application in the bone and fixed prosthesis showed less significance when compared to the zygomatic implants which was statistically significant at p = 0.03.
摘要：
■这项研究的目的是评估上颌骨切除术病例中the骨植入物的应力分布，并使用有限元分析了解这种康复选择的长期预后。
■使用计算机断层扫描对一名在毛霉菌病后接受上颌骨切除术的患者设计了三维有限元模型。颌骨植入物和基台是根据制造商的设计进行设计的。将四zy骨植入物放置在犬和前磨牙区域中，两侧进入zy骨。设计了一个假体，该假体具有从第一磨牙两侧延伸的完整牙齿，并将其连接到多单位基牙和the骨植入物上。在假体两侧的六个不同位置向the骨植入物施加力，其中包括咬合和中央切牙区域的侧向指向力，犬区,和摩尔区域使用vonMises标准。进行了三维有限元分析，在各种载荷下记录了最大应力分布。2013年发布的Windows版本22.0的社会科学统计软件包。Armonk,纽约：IBM公司,用于进行统计分析。使用Kruskal-Wallis检验来比较平均压力值。使用Dunn的事后检验对植入物中施加力之间的平均应力值差异进行了多次比较。
■在模型中在植入物的远端头部观察到最大应力。在模型中在植入物的顶点处观察到最小应力。基于骨和固定假体中的力施加的平均应力值与zy骨植入物相比显示出较小的意义，在p=0.03时具有统计学意义。
■使用计算机断层扫描对一名在毛霉菌病后接受上颌骨切除术的患者设计了三维有限元模型。颌骨植入物和基台是根据制造商的设计进行设计的。将四zy骨植入物放置在犬和前磨牙区域中，两侧进入zy骨。设计了一个假体，该假体具有从第一磨牙两侧延伸的完整牙齿，并将其连接到多单位基牙和the骨植入物上。在假体两侧的六个不同位置向the骨植入物施加力，其中包括咬合和中央切牙区域的侧向指向力，犬区,和摩尔区域使用vonMises标准。进行了三维有限元分析，在各种载荷下记录了最大应力分布。2013年发布的Windows版本22.0的社会科学统计软件包。Armonk,纽约：IBM公司,用于进行统计分析。使用Kruskal-Wallis检验来比较平均压力值。使用Dunn的事后检验对植入物中施加力之间的平均应力值差异进行了多次比较。
■在模型中在植入物的远端头部观察到最大应力。在模型中在植入物的顶点处观察到最小应力。基于骨和固定假体中的力施加的平均应力值与zy骨植入物相比显示出较小的意义，在p=0.03时具有统计学意义。
