Statement of problem

Short and extra-short implants with Morse taper connections were developed to avoid grafting procedures. How the stresses around these implants differ with abutments of different angulations is unclear.

Purpose

The purpose of this finite element study was to analyze the stress distribution in different structures (abutment, implant, and bone) of an extra-short implant with a Morse taper connection to the abutment (Arcsys-FGM-Brazil) (5.0×5.0 mm and 4.3×5.0 mm) when different abutment degrees were used.

Material and methods

Eight 3D models were designed according to each group under analysis: group 5DS (5.0×5.0-mm implants with straight abutment), group 5DA (5.0×5.0-mm implants with 20-degree angled abutments), group 4DS (4.3×5.0-mm implants with straight abutments), and group 4DA (4.3×5.0-mm implants with 20-degree angled abutments). Axial and oblique loads of 150 N were applied on the mandibular molar crowns.

Results

The oblique loads and angled abutments had higher stress values in the whole model (implant, abutment, and bone) than the axial loads and straight abutments. Implants with a different diameter had almost the same stress distribution on the implant, abutment, and bone. The yield limit was exceeded in the cortical bone with oblique loads and was also exceeded in implant models when an angled abutment with oblique loads was used.

Conclusions

Extra-short implants with Morse taper connections to the abutment had higher stress concentrations with an angled abutment on oblique loads, and the peri-implant bone was the most damaged structure.

中文翻译：

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倾斜摩擦系统中超短植入物的应力分布：有限元分析研究。

问题陈述

开发了带有莫氏锥度连接的短和超短植入物以避免移植程序。这些种植体周围的应力如何因不同角度的基台而不同尚不清楚。

目的

这项有限元研究的目的是分析带有莫氏锥度连接到基台 (Arcsys-FGM-Brazil) (5.0×5.0 mm) 的超短种植体在不同结构（基台、种植体和骨骼）中的应力分布和 4.3×5.0 mm) 时使用不同的基台度。

材料与方法

根据分析的每组设计了八个 3D 模型：5DS 组（5.0×5.0-mm 直基台种植体）、5DA 组（5.0×5.0-mm 20 度角基台种植体）、4DS 组（4.3×5.0- mm 种植体，带直基台）和 4DA 组（4.3×5.0-mm 种植体，带 20 度角基台）。对下颌磨牙冠施加 150 N 的轴向和斜向载荷。

结果

在整个模型（种植体、基台和骨骼）中，斜向载荷和成角度的基台比轴向载荷和直基台具有更高的应力值。不同直径的种植体在种植体、基台和骨骼上的应力分布几乎相同。带有倾斜载荷的皮质骨超过了屈服极限，当使用带有倾斜载荷的倾斜基台时，在种植体模型中也超过了屈服极限。

结论

与基台有莫氏锥度连接的超短种植体在斜向载荷下的倾斜基台具有更高的应力集中，种植体周围的骨是受损最严重的结构。