Related Experiment Video
Updated: Dec 13, 2025
08:46
Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
Published on: July 24, 2018
11.1K
Orthodontic force prediction model of T-loop closing spring based on dynamic resistance model
Jingang Jiang1,2, Houjun Chen1, Zhiyuan Huang1
1Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, China.
Summary
This study developed a dynamic model to predict orthodontic T-loop forces, finding clearance distance significantly impacts force. This model aids orthodontists in effective and safe treatment planning.
Area of Science:
- Biomedical Engineering
- Orthodontics
- Dental Mechanics
Background:
- Malocclusion impairs oral function, with orthodontic treatment being the primary therapy.
- The precise relationship between T-loop shape and orthodontic force remains unclear, lacking a mathematical model.
Purpose of the Study:
- To establish a dynamic orthodontic force prediction model for T-loops.
- To analyze the T-loop treatment process for accurate force prediction.
Main Methods:
- Developed a model based on dental jaw resistance, beam deformation theory, and T-loop characteristics.
- Conducted experiments using 11 types of orthodontic archwires, varying materials, cross-sectional sizes, and clearance distances.
- Measured forces using a dynamic force measuring device after immersing T-loops in hot water.
Main Results:
- Orthodontic force positively correlates with cross-sectional size and clearance distance.
- Clearance distance has a greater influence on orthodontic force than cross-sectional size.
- The model's predicted forces showed a low deviation (1.10%-9.09%) from experimental values.
Conclusions:
- The dynamic orthodontic force prediction model accurately predicts T-loop forces.
- The model can enhance treatment effectiveness, shorten treatment duration, and guide orthodontists for safe and efficient practice.
Related Concept Videos
01:23Euler's Formula to Columns: Problem Solving
853
Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
The system comprises two vertical rigid bars, AB and BC, of...
The system comprises two vertical rigid bars, AB and BC, of...
853
01:14Design Example: Frog Muscle Response
488
A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
488
01:14Stability of structures
381
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
381
01:15Thin-Walled Hollow Shafts
440
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
440
01:24One-Degree-of-Freedom System
700
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
700
01:12Temperature Dependent Deformation
305
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
305