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Related Concept Videos

Types of Cement II01:22

Types of Cement II

Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate resistance.
Fineness of Cement01:15

Fineness of Cement

The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Strength of Cement01:20

Strength of Cement

Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...
Types of Cement I01:21

Types of Cement I

Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
Wedges01:24

Wedges

A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...

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Related Experiment Video

Updated: Jul 2, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

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

Published on: December 20, 2024

Fixed or loose? Dichotomy in RSA data for cemented cups.

Per Aspenberg1, Philippe Wagner, Kjell G Nilsson

  • 1Department of Orthopaedics, IKE, Faculty of Health Sciences, Linköping, Sweden. Per.Aspenberg@inr.liu.se

Acta Orthopaedica
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

This study reveals a distinct dichotomy in prosthesis migration, separating stable implants from those at risk of loosening. This finding, using Roentgen stereometric analysis (RSA), suggests a new way to predict implant performance.

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Last Updated: Jul 2, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Published on: July 21, 2014

Area of Science:

  • Orthopedic biomechanics
  • Medical imaging analysis
  • Statistical modeling in medicine

Background:

  • Roentgen stereometric analysis (RSA) typically shows continuous migration patterns for prostheses.
  • The existence of a distinct dichotomy between stable and migrating prostheses has not been previously tested.
  • A mixture distribution algorithm was employed to explore this potential dichotomy.

Purpose of the Study:

  • To investigate the hypothesis of a dichotomy in prosthesis migration patterns.
  • To determine if patient and implant factors explain observed migration differences.
  • To evaluate the utility of mixture distribution analysis in medical research.

Main Methods:

  • Analysis of migration data from 147 cemented acetabular cups using Roentgen stereometric analysis (RSA).
  • Application of a novel frequency distribution analysis algorithm, Rmix, to assess migration patterns.
  • Examination of migration vectors and migration along three spatial axes over two years.

Main Results:

  • A significant dichotomy was observed in migration vectors after two years, separating the sample into two lognormal subgroups.
  • While some cup designs were over-represented in one subgroup, no single factor explained the dichotomy.
  • Analysis along spatial axes revealed a similar dichotomy, with most cups (80%) showing stable, normally distributed migration around 0 mm.

Conclusions:

  • A clear dichotomy exists in acetabular cup migration, distinguishing stable implants from those at risk of loosening.
  • The stable subgroup, comprising most implants in the second postoperative year, indicates good performance.
  • Identifying these subgroups could enhance the prediction of prosthesis performance and has broader applications in medical data analysis.