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首页> 外文期刊>The Journal of Prosthetic Dentistry >Stress transfer of four mandibular implant overdenture cantilever designs.
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Stress transfer of four mandibular implant overdenture cantilever designs.

机译：四种下颌种植体覆盖义齿悬臂设计的应力传递。

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STATEMENT OF PROBLEM: The influence of implant number and cantilever design on stress distribution on bone has not been sufficiently assessed for the mandibular overdenture. PURPOSE: The purpose of this simulation study was to measure, photoelastically, the biologic behavior of 2 or 3 implants retaining different designs of cantilevered bar mandibular overdentures and to compare load characteristics. MATERIALS AND METHODS: Two photoelastic models of a human edentulous mandible were fabricated having 2 or 3 screw-type implants (Nobel Biocare, 3.75 x 10mm) embedded in the parasymphyseal area. Bar frameworks using a 7-mm cantilever were fabricated for both models. A clip-retained and a plunger-retained (SwissLoc) prosthesis were fabricated as superstructures for each framework. Vertical loads of 15 and 30 pounds were applied unilaterally to the first molar and 15 pounds to the first premolar on each of the 4 standardized overdenture prostheses. The cantilever was removed from the 2-implant framework and the clip-retained prosthesis was loaded similarly on the first molar with 25 pounds. Stresses that developed in the supporting structure were monitored photoelastically and recorded photographically. RESULTS: While all 4 prostheses demonstrated low stress transfer to the implants, the plunger-retained prosthesis caused more uniform stress distribution to the ipsilateral terminal abutment compared to the clip-retained prosthesis and provided retention security under tested loads. The plunger-retained prosthesis retained by 2 implants provided better load sharing from the ipsilateral edentulous ridge than the clip-retained prosthesis retained by 3 implants, and lower resultant stresses were seen on the implants. CONCLUSIONS: Under load, all prosthetic designs demonstrated a low stress transfer to the ipsilateral abutment and to the contralateral side of the arch. The plunger-retained prosthesis retained by 2 implants demonstrated a more uniform stress transfer to the ipsilateral terminal abutment than the clip-retained prosthesis retained by 3 implants and provided more retention, given the implant configuration, prosthetic design and arch form.
机译：问题陈述：对于下颌覆盖义齿，尚未充分评估植入物数量和悬臂设计对骨骼应力分布的影响。目的：本模拟研究的目的是以光弹性方式测量保留悬臂式下颌覆盖义齿的不同设计的2或3个植入物的生物学行为，并比较负载特性。材料和方法：制作了两个人类无牙颌的光弹性模型，其中有2枚或3枚螺钉型植入物（Nobel Biocare，3.75 x 10mm）嵌入到副突旁区域。两种模型均使用7毫米悬臂制造钢筋框架。夹子固定和柱塞固定（SwissLoc）假体被制造为每个框架的上部结构。在4个标准化覆盖义齿假体的每一个上，分别对第一颗臼齿施加15磅和30磅的垂直载荷，对第一颗臼齿施加15磅的垂直载荷。从2-植入物框架中移出悬臂，将夹子固定的假体类似地以25磅的力加载到第一磨牙上。对支撑结构中产生的应力进行光弹性监测，并进行照相记录。结果：虽然所有四个假体均显示出低的应力传递至植入物，但与夹子固定的假体相比，柱塞固定的假体与同侧末端基台的应力分布更为均匀，并在测试载荷下提供了固定安全性。与3个植入物所保持的夹子保持假体相比，由2个植入物所保持的柱塞保持假体提供了更好的同侧无牙颌脊的负载分担，并且在种植体上观察到了更低的合应力。结论：在负载下，所有假体设计均显示出低应力转移至同侧基台和足弓的对侧。与3个植入物保持的夹子固定假体相比，由2个植入物保持的柱塞保持假体显示出更均匀的应力转移到同侧末端基台，并且在给定植入物配置，假体设计和牙弓形状的情况下，它们提供了更多的保持力。

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