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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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Curing of Concrete01:20

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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

Curing Methods

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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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Effect of Shortened Light-Curing Modes on Bulk-Fill Resin Composites.

C S Sampaio, P G Pizarro, P J Atria

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    Shortened light curing times for bulk-fill resin composites do not impact volumetric polymerization shrinkage or cohesive strength. However, shear bond strength may be reduced, especially after thermal cycling, highlighting the importance of light-curing unit output.

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    Area of Science:

    • Dental Materials Science
    • Polymer Chemistry
    • Restorative Dentistry

    Background:

    • Bulk-fill resin composites (BFRCs) offer clinical advantages for posterior restorations.
    • Optimizing light-curing protocols is crucial for achieving adequate material properties.
    • Shortened curing times are desirable but require validation for efficacy.

    Purpose of the Study:

    • To evaluate the impact of different light-curing modes on volumetric polymerization shrinkage (VPS), shear bond strength (SBS) to dentin, and cohesive tensile strength (CTS) of BFRCs.
    • To assess the influence of shortened curing times (10-second high mode, 5-second turbo mode) on these properties.
    • To determine the effect of thermal cycling on the mechanical integrity of BFRCs cured with different modes.

    Main Methods:

    • Six groups of BFRCs were tested using high (10s) and turbo (5s) modes with specific light-curing units.
    • Volumetric polymerization shrinkage was measured using micro-computed tomography.
    • Shear bond strength and cohesive tensile strength were evaluated after 24-hour storage and after 5000 thermal cycles.

    Main Results:

    • Volumetric polymerization shrinkage was primarily material-dependent, with some variations observed between specific BFRCs.
    • Shear bond strength was negatively affected by thermal cycling in most groups.
    • Cohesive tensile strength was generally unaffected by curing modes, though thermal cycling impacted some groups.
    • One experimental BFRC (TEE) demonstrated similar or improved properties with shortened light-curing times.

    Conclusions:

    • Shortened light curing protocols do not compromise volumetric polymerization shrinkage or cohesive tensile strength in bulk-fill resin composites.
    • Shear bond strength can be negatively affected by shortened curing times, particularly after thermal cycling.
    • Clinicians must consider the output of their light-curing units when employing shortened curing protocols for bulk-fill resin composites.