A dhesion and Adhesive Joint

Adhesion

Adhesion is a process of solid and/or liquid interaction of one material (adhesive or adherent) with other (adherend) at a single interface. For example, Pit and fissure sealant.

The material or film added to produce the adhesion is known as the “adhesive or adherent” and the material to which it is applied is called the “adherend”.

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Adhesive joint

It is the result of interaction of a layer of intermediate material (adhesive or adherent) with two surfaces (adherends) producing two adhesive surfaces.

Adhesion is classified as:

Physical bonding:

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It involves Van der Waals or electrostatic interactions that are relatively weak.

It occurs when the surfaces are smooth and chemically dissimilar.

Chemical bonding:

It involves bonding between atoms formed across the interface from the adhesive to the adherent.

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The extent of this bonding is limited and overall contribution to the strength is quite low.

Mechanical bonding:

It is the result of interface that involves undercuts and rough surface to produce interlocking of materials.

Almost every case of dental adhesion is based primarily on mechanical bonding.