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Porosity in Cement Paste

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...

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Updated: Dec 17, 2025

Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry

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Published on: February 2, 2018

Teeth resorption at cement - enamel junction (CEJ) - Microscopy analysis.

Sara Metwally¹, Urszula Stachewicz¹

¹International Centre of Electron Microscopy for Materials Science, Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology Al. A. Mickiewicz 30, 30-059 Kraków, Poland.

Micron (Oxford, England : 1993)

|June 27, 2020

Summary

The cement-enamel junction (CEJ) gap is linked to tooth resorption. Dentine exposure at the CEJ gap may initiate and propagate idiopathic tooth resorption, risking permanent dentition loss.

Keywords:

CEJ Cementum Enamel Junction Resorption Teeth

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Area of Science:

Dental Research
Oral Biology
Biomaterials Science

Background:

The cement-enamel junction (CEJ) is crucial in clinical dentistry.
Idiopathic tooth resorption poses a risk to permanent dentition.
Understanding CEJ morphology is vital for resorption research.

Purpose of the Study:

To investigate CEJ morphology in healthy and resorbing teeth.
To correlate CEJ structure with the initiation and propagation of tooth resorption.
To analyze the chemical composition at the CEJ border.

Main Methods:

Examination of CEJ types (coronal cementum, abutment, gap) using light and scanning electron microscopy.
Energy-dispersive X-ray spectroscopy (EDX) to analyze calcium (Ca) and phosphorus (P) concentrations.
Comparative analysis of healthy versus resorbing teeth.

Main Results:

A strong correlation was found between the CEJ gap and tooth resorption.
Dentine exposure at the CEJ gap appears to be a key factor.
Morphological and chemical analyses revealed distinct CEJ characteristics in resorption.

Conclusions:

The CEJ gap plays a significant role in idiopathic tooth resorption.
Dentine exposure at the CEJ facilitates resorption initiation and progression.
Further research into CEJ integrity is warranted for preserving dentition.