Related Experiment Video
Updated: Mar 7, 2026
14:31
Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees
Published on: July 15, 2009
14.6K
Evaluation of Stress Distribution on Implant-Retained Auricular Prostheses: The Finite Element Method
The International Journal of Oral & Maxillofacial Implants
|February 24, 2017
Summary
The angle of removal force significantly impacts stress on craniofacial implants. Removing auricular prostheses at 90 degrees, rather than 45 degrees, reduces implant stress, especially with lower-retention attachments.
Area of Science:
- Biomaterials Science
- Craniofacial Surgery
- Prosthodontics
Background:
- Craniofacial implants are crucial for auricular prostheses.
- Understanding stress distribution is vital for implant longevity.
- Attachment design influences biomechanical load.
Purpose of the Study:
- To evaluate stress distribution around craniofacial implants.
- To assess the impact of removal forces (45 and 90 degrees) on stress.
- To compare three different attachment combinations for auricular prostheses.
Main Methods:
- Three-dimensional modeling of Hader bar attachments (3 clips, 1 clip/2 ERAs, 1 clip/2 Locators).
- Mechanical testing using an Instron universal testing machine to determine removal forces.
- Finite element analysis to analyze stress distribution under varying removal angles and forces.
Main Results:
- Removal angle significantly affected stress magnitude and direction on implants.
- Higher stress magnitudes were observed at a 45-degree removal angle compared to 90 degrees.
- A specific combination of retention clips and Locators showed the highest stress at 45 degrees.
Conclusions:
- The angle of prosthesis removal critically influences implant stress.
- Prosthodontists should advise patients to remove prostheses at 90 degrees.
- Utilizing low-retention attachments can further minimize stress on implants.
Related Concept Videos
01:24Stress Concentrations
750
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
750
01:18Stress Concentrations in Circular Shafts
612
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
612
01:04Applications of Stress
706
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
The...
706
01:15Stress: General Loading Conditions
646
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
646
01:23Components of Stress
602
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
Interestingly, the hidden cube faces also experience these stresses, equal and...
602
01:23Stresses under Combined Loadings
511
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
511