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Related Concept Videos

Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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Accelerators01:17

Accelerators

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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
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Bone Disorders01:29

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Retarders01:19

Retarders

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Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
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Related Experiment Video

Updated: Nov 3, 2025

Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique
05:42

Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique

Published on: July 27, 2022

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Accelerated Aging Effects on Color Stability of Potentially Color Adjusting Resin-based Composites.

L Sensi, C Winkler, S Geraldeli

    Operative Dentistry
    |June 4, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Accelerated aging significantly impacts resin composite color stability. Omnichroma and Venus Pearl showed the best color retention, while GC Kalore and Harmonize exhibited clinically unacceptable color changes.

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    Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
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    Area of Science:

    • Dental Materials Science
    • Polymer Chemistry

    Background:

    • Color stability is crucial for the aesthetic longevity of resin-based dental composites.
    • Commercial composite resins vary in their composition and potential for color alteration over time.
    • Accelerated aging tests simulate long-term clinical exposure to evaluate material durability.

    Purpose of the Study:

    • To compare the color stability of five commercial resin-based composite materials after accelerated aging.
    • To identify materials with superior color stability under simulated environmental stress.

    Main Methods:

    • Five composite resins (Estelite Omega, GC Kalore, Venus Pearl, Harmonize, Omnichroma) were fabricated into specimens.
    • Specimens underwent accelerated aging in a Xenon Test Chamber for 300 hours.
    • Color change (ΔE*ab) was measured using a spectrophotometer before and after aging.

    Main Results:

    • Statistically significant differences in color change were observed among the materials.
    • Omnichroma and Venus Pearl demonstrated the lowest and clinically acceptable color change.
    • GC Kalore and Harmonize exhibited the highest color change, exceeding the clinically unacceptable threshold (ΔE*ab > 3.3).

    Conclusions:

    • Accelerated aging significantly affects the color stability of resin composites.
    • Omnichroma and Venus Pearl offer superior color stability for aesthetic dental restorations.
    • GC Kalore and Harmonize may not be suitable for applications requiring long-term color predictability.