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Related Concept Videos

Factors Affecting Creep01:28

Factors Affecting Creep

In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
Setting Time of Cement01:12

Setting Time of Cement

The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
Strength of Cement01:20

Strength of Cement

Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in ASTM C...
Porosity in Cement Paste01:18

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
Factors Affecting Workability01:24

Factors Affecting Workability

The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
Types of Cement I01:21

Types of Cement I

Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...

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Updated: May 26, 2026

Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
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Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests

Published on: March 7, 2025

Factors affecting the cement-post interface.

F Zicari1, J De Munck, R Scotti

  • 1Leuven BIOMAT Research Cluster, Department of Prosthetic Dentistry, Katholieke Universiteit Leuven, Leuven, Belgium.

Dental Materials : Official Publication of the Academy of Dental Materials
|December 16, 2011
PubMed
Summary
This summary is machine-generated.

The type of glass fiber post, composite cement, and surface treatment significantly impact bond strength. The self-adhesive cement and silicated alumina particle treatment showed higher bond strength, while post type and depth affected results.

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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)
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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)
08:59

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

Published on: December 16, 2019

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Glass fiber posts are widely used for root canal restoration.
  • Ensuring a strong bond between the post, cement, and root canal is crucial for long-term success.
  • Various factors, including post material, cement type, and surface treatment, can influence this bond strength.

Purpose of the Study:

  • To investigate the influence of different glass fiber post types, composite cements, and post-surface pre-treatments on the push-out bond strength.
  • To evaluate how these variables interact and affect the cement-post interface strength.

Main Methods:

  • Three types of glass fiber posts (epoxy resin, proprietary composite resin, methacrylate resin) were tested.
  • Three composite cements (etch-and-rinse, self-etch, self-adhesive) were used for luting.
  • Posts underwent different surface treatments: untreated, silane, or silicated alumina particles (Cojet system).
  • Bond strength was assessed using a push-out test on sections of CAD-CAM blocks, excluding dentin interface effects.

Main Results:

  • All tested variables (post type, cement type, surface treatment) significantly affected push-out bond strength (p<0.001).
  • The FRC-Plus post exhibited significantly lower bond strength.
  • The self-adhesive cement (RelyX Unicem) and the Cojet surface treatment demonstrated significantly higher bond strength.
  • Bond strength decreased significantly from the coronal to the apical region.
  • Significant interactions were observed between the tested variables.

Conclusions:

  • The choice of glass fiber post, composite cement, and surface pre-treatment critically influences the cement-post interface bond strength.
  • The complexity of these interactions makes establishing definitive clinical guidelines challenging.
  • Further long-term durability studies are recommended to better inform clinical practice.