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Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...

Adherens Junctions

Adherens Junctions

Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...

Anchoring Junctions

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...

Bonding and Strength of Aggregate

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...

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Related Experiment Video

Updated: May 20, 2026

Oral Biofilm Formation on Different Materials for Dental Implants

Oral Biofilm Formation on Different Materials for Dental Implants

Published on: June 24, 2018

Dental adhesion: mechanism, techniques and durability.

N Manuja¹, R Nagpal, I K Pandit

¹Department of Paediatric Dentistry, Kothiwal Dental College, Moradabad, Uttar Pradesh, India. naveenmanuja@yahoo.com

The Journal of Clinical Pediatric Dentistry

|July 31, 2012

Summary

Dental adhesives offer good immediate bonding, but long-term durability remains a challenge. Simplified techniques may harm resin-tooth interface stability, with three-step etch-and-rinse methods showing the best durability.

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Adhesion Science

Background:

Contemporary dental adhesives provide effective immediate bonding.
Long-term durability of resin-dentin bonds is a significant clinical issue.
Simplified adhesive techniques may compromise the stability of the resin-tooth interface.

Purpose of the Study:

To review the fundamental processes of dental adhesion to enamel and dentin.
To identify factors influencing the long-term performance of modern dental adhesives.
To discuss current strategies for enhancing bond durability in restorative dentistry.

Main Methods:

Literature review of scientific studies on dental adhesion.
Analysis of factors affecting resin-dentin bond degradation.
Discussion of different adhesive techniques and their long-term outcomes.

Main Results:

Hydrostatic pulpal pressure, dentinal fluid flow, and dentin wetness impact adhesive interaction.
Bond degradation mechanisms include water sorption, hydrolysis, and matrix metalloproteinase activation.
Three-step etch-and-rinse adhesives are considered the gold standard for bond durability.

Conclusions:

Simplification in adhesive application can negatively affect long-term bond stability.
Understanding degradation pathways is crucial for developing more durable dental adhesives.
Further research into improving bond durability is essential for successful dental restorations.