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Curing of Concrete01:20

Curing of Concrete

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The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
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Curing Methods01:26

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Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
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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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Controlling In Vivo, Human Pulp Temperature Rise Caused by LED Curing Light Exposure.

D C Zarpellon, P Runnacles, C Maucoski

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    Using air spray during LED light curing significantly reduces heat in dental pulp. This method prevents excessive pulp temperature rise, enhancing patient safety during dental procedures.

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    Area of Science:

    • Dental Materials Science
    • Biomedical Engineering
    • Clinical Dentistry

    Background:

    • Light-curing units (LCUs) are essential in modern dentistry.
    • High-power LED LCUs can generate significant heat, potentially damaging dental pulp.
    • Minimizing pulp temperature rise during light curing is crucial for patient safety and treatment success.

    Purpose of the Study:

    • To evaluate the in vivo effectiveness of simultaneous air spray application in reducing pulp temperature rise during LED LCU exposure.
    • To assess the impact of air spray on heat generation in intact premolars.

    Main Methods:

    • Intact premolars from orthodontic patients were used (n=9).
    • A minute pulp exposure was created, and real-time pulp temperature was monitored.
    • Teeth were exposed to a high-power LED LCU for 30 seconds, with and without simultaneous air spray.

    Main Results:

    • Peak pulp temperatures were significantly lower when air spray was used concurrently with LED exposure (p<0.001).
    • The air spray group showed significantly lower temperature changes from baseline compared to the no-air-spray group (p<0.001).
    • In the air spray group, peak temperatures were even lower than baseline.

    Conclusions:

    • Simultaneous application of air spray effectively prevents in vivo pulp temperature rise during LED light curing.
    • Air spray is a viable method to mitigate heat-related risks associated with dental light-curing procedures.