Related Experiment Video
Updated: May 31, 2026
07:09
In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
Published on: March 7, 2014
Tilted orthodontic micro implants: a photoelastic stress analysis.
Seçil Çehreli1, Ayça Arman Özçırpıcı, Alev Yılmaz
1Department of Orthodontics, School of Dentistry, Başkent University, Ankara, Turkey.
European Journal of Orthodontics
|July 13, 2011
Summary
Torque-tightening orthodontic microimplants generates stress, with 90-degree placements showing the most even distribution. Static loads minimally affect these peri-implant stresses, especially in tilted implants.
Area of Science:
- Biomaterials Science
- Orthodontics
- Biomechanics
Background:
- Orthodontic microimplants are crucial for tooth movement.
- Understanding stress distribution around these implants is vital for stability.
- Current research lacks detailed analysis of stress patterns under initial loading.
Purpose of the Study:
- To analyze peri-implant stresses around orthodontic microimplants.
- To evaluate stress changes after torque-tightening and static load application.
- To compare stress distribution based on different implant insertion angles.
Main Methods:
- Quasi-three-dimensional photoelastic stress analysis was employed.
- Self-tapping microimplants were inserted at 30, 45, 70, and 90 degrees.
- Stress patterns were recorded after insertion and static load (250 g) application.
Main Results:
- Torque-tightening created significant peri-implant stresses.
- 90-degree placed implants showed the most homogeneous stress distribution upon insertion.
- Static loading had minimal impact on stress fields, particularly at the cervical region of tilted implants.
Conclusions:
- Torque-tightening of orthodontic microimplants generates a stable stress field.
- Implant angulation influences initial stress distribution.
- Moderate static orthodontic loads do not significantly alter established peri-implant stresses.
Related Concept Videos
01:18Transformation of Plane Stress
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's faces...
01:16Eccentric Axial Loading in a Plane of Symmetry
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
01:20Normal Strain under Axial Loading
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
01:18Stress Concentrations in Circular Shafts
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...
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
01:15Stress: General Loading Conditions
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.