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Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls


Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
Steel Fastening Techniques01:17

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...

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Related Experiment Video

Updated: Jun 29, 2026

Surgical Fixation of Sternal Fractures: Preoperative Planning and a Safe Surgical Technique Using Locked Titanium Plates and Depth Limited Drilling
15:11

Surgical Fixation of Sternal Fractures: Preoperative Planning and a Safe Surgical Technique Using Locked Titanium Plates and Depth Limited Drilling

Published on: January 5, 2015

A new design for post and core restorations implementing positive locking.

Ernst-Jürgen Richter1, Julian Boldt, Sybille Groth

  • 1Department of Prosthodontics, Julius Maximilians University Würzburg, Würzburg, Germany.

Biomedizinische Technik. Biomedical Engineering
|October 9, 2008
PubMed
Summary
This summary is machine-generated.

A novel post and core dental restoration design utilizes a short, wide post with positive locking for enhanced stability. This method reduces the risk of decementation and root fracture, offering improved resistance compared to conventional posts.

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15:11

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07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Area of Science:

  • Restorative Dentistry
  • Biomaterials Engineering
  • Dental Mechanics

Background:

  • Post and core restorations require balancing stability of the post, root dentine, and tooth-joint with apical seal.
  • Conventional posts often fail due to joint fatigue, root fracture, or perforation, particularly in removable prostheses.
  • Current post designs rely on frictional or chemical locking, which can be prone to failure.

Purpose of the Study:

  • To introduce and evaluate a new post and core design featuring a short, large-diameter post with positive locking.
  • To assess the stability and extraction resistance of the novel design compared to conventional methods.

Main Methods:

  • A new post design was developed using preparation tools to create an undercut cavity with an inverse taper in the root.
  • A cylindrical post was designed to be spread at the bottom, matching the prepared inverse taper for positive locking.
  • In vitro testing was conducted to evaluate the extraction resistance of the new post system.

Main Results:

  • The novel design achieved positive locking by spreading the post within a prepared undercut cavity.
  • Initial in vitro stability tests demonstrated extraction resistance comparable to conventional posts.
  • The positive locking mechanism reduced reliance on luting/bonding agents for stability.

Conclusions:

  • The proposed short, large-diameter post with positive locking offers a promising alternative for post and core restorations.
  • This design enhances stability and reduces failure modes associated with conventional posts.
  • Further research should validate long-term clinical performance and efficacy.