一体式和分体式牙科种植体支持的全口 4 种植体支持式修复体的应力有限元分析。
Finite Element Analysis of the Stresses Induced by One-Piece and Two-Piece Dental Implants Supporting All-on-4 Implant-Supported Prostheses.
出版信息
Int J Oral Maxillofac Implants. 2022 Jul-Aug;37(4):763-770. doi: 10.11607/jomi.9353.
PURPOSE
To find out the difference in the stresses induced by one-piece monophasic and two-piece dental implants supporting All-on-4 implant-supported prostheses using finite element analysis.
MATERIALS AND METHODS
Two finite element maxillary models were designed: In the two-piece model, two-piece dental implants were used, and in the one-piece model, one-piece dental implants were used. The dental implants were placed according to the All-on-4 treatment concept. The anterior implants were axially placed; however, the posterior implants were placed with a distal inclination of 15 degrees. In each model, the prosthetic superstructure was designed to be a titanium implant prosthesis with zirconia crowns. Three loading scenarios were applied in this study. The first scenario simulated biting function with a total load of 250 N. The second scenario simulated incision function in which 90-N horizontal static load was applied to the palatal surface of central incisors. The third scenario simulated biting in the presence of a cantilever.
RESULTS
In the three loading scenarios, the stresses were higher in the two-piece model. Higher stress values were recorded posteriorly rather than anteriorly in both models.
CONCLUSION
One-piece dental implants induce lower stress values compared with two-piece dental implants when used in All-on-4 implant-supported prostheses.
目的
通过有限元分析，找出支持全口即刻负重的一体式和两段式牙科种植体在受力上的差异。
材料和方法
设计了两个有限元上颌模型：在两段式模型中使用两段式牙科种植体，在一体式模型中使用一体式牙科种植体。根据全口即刻负重治疗理念放置牙科种植体。前牙种植体采用轴向放置，而后牙种植体则带有 15 度的远中倾斜角度。在每个模型中，义齿上部结构设计为带有氧化锆牙冠的钛植入物义齿。本研究共应用了三种加载方案。第一种方案模拟了总负荷为 250N 的咬合功能。第二种方案模拟了在中切牙腭面施加 90N 水平静力的切口功能。第三种方案模拟了存在悬臂梁的咬合情况。
结果
在三种加载方案中，两段式模型中的应力更高。在两种模型中，后牙部位的应力值均高于前牙部位。
结论
在全口即刻负重的种植体支持式义齿中，与两段式牙科种植体相比，一体式牙科种植体产生的应力值更低。
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