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Related Concept Videos

Mortar Properties01:17

Mortar Properties

691
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
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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...
658
Mortar Joint Deterioration in Masonry01:13

Mortar Joint Deterioration in Masonry

453
Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
The...
453
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

336
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
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Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

417
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
417
Cavity Drainage and Flashings in Masonry walls01:20

Cavity Drainage and Flashings in Masonry walls

683
Typically, a cavity wall consists of two wythes separated by a gap of at least 2 inches, which may contain insulation while still maintaining a minimum clear space of 1 inch to facilitate adequate drainage. Advanced methods like the insertion of a continuous drainage mat can further reduce this space while ensuring effective moisture expulsion.
Weep holes, strategically placed at the base of the cavity, are critical for draining accumulated water. These openings are created by leaving head...
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Accessible Silicone Chip-to-Membrane Sealing Procedure for Flexible, Reliable Bonding
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Moisture-tolerant resin-based sealant: A boon.

Prasanna Kumar Bhat1, Sapna Konde, Sunil N Raj

  • 1Department of Pedodontics and Preventive Dentistry, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.

Contemporary Clinical Dentistry
|October 15, 2013
PubMed
Summary

Moisture-tolerant pit and fissure sealants offer effective caries prevention in children. These sealants are less technique-sensitive, simplifying application and improving retention in young permanent teeth.

Keywords:
Bonding agentconventional resin-based sealantsglass ionomer sealantmoisture-tolerant resin-based sealantretention

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Area of Science:

  • Dental materials science
  • Pediatric dentistry
  • Caries prevention

Background:

  • Occlusal caries is a significant concern in young permanent teeth.
  • Pit and fissure sealants are a primary preventive measure.
  • Evaluating sealant performance is crucial for optimal caries control.

Purpose of the Study:

  • To clinically compare the retention and caries prevention of four sealant types.
  • To assess moisture-tolerant resin-based sealant versus conventional sealants and Glass Ionomer Cement Sealant.
  • To evaluate sealant performance in high-caries-risk children.

Main Methods:

  • 80 children (6-9 years) with newly erupted first molars participated.
  • Four sealant groups: moisture-tolerant resin, conventional resin (with/without bonding agent), Glass Ionomer Cement.
  • Evaluations at 6 and 12 months using Modified Simonsen's criteria.

Main Results:

  • Moisture-tolerant resin-based sealant demonstrated successful pit and fissure sealing.
  • Hydrophilic chemistry of moisture-tolerant sealants reduces technique sensitivity.
  • Simplified application procedures are associated with moisture-tolerant sealants.

Conclusions:

  • Moisture-tolerant resin-based sealants are effective for caries prevention.
  • Their hydrophilic nature simplifies application and enhances clinical utility.
  • These sealants represent a valuable option for pediatric dental caries management.