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Related Concept Videos

Design Consideration01:22

Design Consideration

Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
Space Trusses01:25

Space Trusses

A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
At the core of a space truss lies the fundamental unit known as the tetrahedron. This structure is composed of six members that form a three-dimensional shape...
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
Stability of structures01:14

Stability of structures

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,...
Space Trusses: Problem Solving01:29

Space Trusses: Problem Solving

A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
Consider a tripod consisting of a tetrahedral space truss with a ball-and-socket joint at C. Suppose the height and lengths of the horizontal and vertical...
Saint-Venant's Principle01:18

Saint-Venant's Principle

The principle of Saint-Venant postulates that the stress distribution within a structural member does not rely on the precise method of load application except in the vicinity of the load application points. Consider a scenario where loads are centrally applied on two plates. In this case, the plates move toward each other without any rotation. This movement causes the member to contract in length and expand in width and thickness. Uniform deformation across all elements and maintaining...

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Related Experiment Video

Updated: Jul 19, 2026

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
12:22

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

Published on: February 16, 2019

Free-end space maintainers: design, utilization and advantages.

Elena Barbería1, Tania Lucavechi, Dora Cárdenas

  • 1Department of Prophylaxis, Pediatric Dentistry and Orthodontics, Faculty of Dentistry, Madrid Complutense University, Spain. barberia@odon.ucm.es

The Journal of Clinical Pediatric Dentistry
|November 10, 2006
PubMed
Summary

Extracting primary molars risks malocclusion due to space loss. This study introduces a novel removable space maintainer designed to guide permanent teeth eruption and prevent complications associated with traditional appliances.

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Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery

Published on: November 14, 2015

Area of Science:

  • Pediatric Dentistry
  • Orthodontics
  • Dental Materials

Background:

  • Primary molars are crucial for proper occlusion development.
  • Extraction of primary molars without space preservation can lead to malocclusion and necessitate extensive orthodontic treatment.
  • Complications in space maintenance are heightened when the first permanent molar has not yet erupted.

Purpose of the Study:

  • To introduce and evaluate a novel removable space maintainer for primary molar extraction sites.
  • To address the challenges posed by unerupted first permanent molars in space maintenance.
  • To present an alternative to sub-gingival space maintainers, minimizing associated complications.

Main Methods:

  • A removable space maintainer with an open end was designed.
  • The appliance functions to guide the eruption of the first permanent molar.
  • It also serves as a prosthetic appliance, maintaining mucosal integrity.

Main Results:

  • The proposed appliance effectively guides the first permanent molar into occlusion.
  • It maintains the integrity of the surrounding mucous membrane.
  • It prevents complications and contraindications linked to sub-gingival space maintainers.

Conclusions:

  • The novel removable space maintainer offers a viable solution for space maintenance following primary molar extraction.
  • This appliance can guide permanent tooth eruption and act as a prosthesis.
  • It provides an effective alternative to conventional space maintainers, especially when the first permanent molar is unerupted.