Department of Prosthodontics and Implantology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
J Prosthodont. 2012 Dec;21(8):604-13. doi: 10.1111/j.1532-849X.2012.00883.x. Epub 2012 Jul 27.
The aim of this study was to establish the optimum design and attachment combination to support an overdenture with minimal stress and flexing produced in the alveolar bone surrounding any natural teeth and/or mini dental implants.
Twelve models were included in the study: the six main models (A, B, C, D, E, and F) were categorized according to the support designs of the overdenture prosthesis, and each model was further subdivided according to the attachment combinations into model 1: with Dalbo elliptic and/or O-ring attachments only and model 2: with flexible acrylic attachments. Vertical loads (35 N) and 17.5 N lateral loads under static conditions were applied to the models to simulate the occlusal forces following the concept of lingualized occlusion. All conditions were created using a finite element software program. Maximum von Mises stress at the level of the attachments and at the bone support foundation interfaces were compared in all 12 models. The flexing of the mandible and the attachments were also compared qualitatively.
Stress on these models was analyzed after the given loading condition. The results showed that the model with three freestanding mini dental implants and flexible acrylic attachments showed the lowest von Mises stress and flexing, while the models with four freestanding mini dental implants and O-ring attachments showed the highest von Mises stress.
Three freestanding mini dental implants with flexible acrylic attachment systems supporting an overdenture were better choices than four mini dental implants with O-ring attachment systems, which showed the maximum flexing and stress values in this qualitative comparison.
本研究的目的是确定最佳设计和附着体组合，以最小的应力和弯曲来支撑覆盖任何天然牙和/或迷你牙种植体周围牙槽骨的覆盖义齿。
本研究纳入了 12 个模型：根据覆盖义齿修复体的支撑设计对 6 个主要模型（A、B、C、D、E 和 F）进行分类，每个模型根据附着体组合进一步细分为模型 1：仅带有 Dalbo 椭圆形和/或 O 形环附着体，以及模型 2：带有弹性丙烯酸附着体。在静态条件下，对模型施加垂直载荷（35 N）和 17.5 N 的侧向载荷，以模拟舌侧咬合概念下的咬合力。所有条件均使用有限元软件程序创建。在所有 12 个模型中比较了附着体水平和骨支撑基础界面的最大 von Mises 应力。还定性比较了下颌骨和附着体的弯曲。
在给定的加载条件下分析了这些模型的应力。结果表明，带有三个独立迷你牙种植体和弹性丙烯酸附着体的模型显示出最低的 von Mises 应力和弯曲，而带有四个独立迷你牙种植体和 O 形环附着体的模型显示出最高的 von Mises 应力。
与带有 O 形环附着体系统的四个迷你牙种植体相比，带有三个独立迷你牙种植体和弹性丙烯酸附着体系统的覆盖义齿是更好的选择，在这种定性比较中，它们显示出最大的弯曲和应力值。
