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Related Concept Videos

Partial Fractions01:28

Partial Fractions

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A partial fraction is a component of a rational expression represented as the sum of simpler fractions. When a rational function is expressed as a ratio of two polynomials, it can often be decomposed into a sum of fractions whose denominators are simpler polynomials, typically linear or irreducible quadratic factors. This process is called partial fraction decomposition, and it is used to simplify complex expressions for integration, solving equations, or analysis.Partial fraction decomposition...
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure.
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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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2-Methacryloyloxyethyl Phosphorylcholine Polymer Treatment of Complete Dentures to Inhibit Denture Plaque Deposition
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Comparative Study Clarifying the Most Suitable Material to Be Used as Partial Denture Clasps.

Sherif Aly Sadek1, Wessam Mohamed Dehis2, Hala Hassan3

  • 1Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.

Open Access Macedonian Journal of Medical Sciences
|July 10, 2018
PubMed
Summary

Non-metal Acetal resin clasps for removable partial dentures (RPDs) demonstrate superior mechanical properties compared to traditional materials. This finding supports Acetal resin as a more suitable material for RPD clasps, enhancing denture longevity and function.

Keywords:
ClaspsCobalt Chromium (CoCr)DeformationDirect RetainerMechanical propertiesRemovable Partial Denture (RPD)RetentionRoughnessThermoplastic AcetalThermopressVersacryl

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Removable partial denture (RPD) clasps are crucial for denture longevity and function.
  • Proper clasp selection ensures control of forces on abutment teeth, provides retention, and meets patient aesthetic demands.
  • Mechanical properties of clasp materials significantly influence their performance.

Purpose of the Study:

  • To mechanically compare the most usable esthetic clasps for removable partial dentures.
  • To identify the most suitable material for fabricating partial denture clasps.

Main Methods:

  • In-vitro evaluation of surface roughness, retention, and deformation of different clasp materials.
  • Mechanical property assessment provides valuable data on material performance.

Main Results:

  • Traditional RPD clasps are often made from unaesthetic cobalt-chromium (CoCr) alloy.
  • Aesthetic alternatives include tooth-colored resin coatings, Thermoplastic Acetal, Versacryl, and Thermopress materials.
  • Non-metal Acetal resin retainers exhibited superior mechanical properties.

Conclusions:

  • Acetal resin clasps offer superior mechanical properties compared to other tested materials.
  • This suggests Acetal resin is a highly suitable material for removable partial denture clasps.