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Adhesion and Dental Adhesives.

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by

Rawan Aldajan

on 2 January 2014

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Transcript of Adhesion and Dental Adhesives.

Adhesion and Dental Adhesives.
What is adhesion?
The force of attraction between unlike molecules, or the attraction between the surfaces of contacting bodies.
Types of adhesion/bonding
These to explain why one material sticks to another .
Cohesion & Adhesion
Similar molecules
Dissimilar molecules
Adhesion is used in all aspects of dentistry:
Retention of restoration
Fixed and removable prosthesis.
Orthodontics
Esthetic dentistry
References:
Phillips Science of dental materials 12th edition.
Lecture: Adhesion Systems, University of Adelaide, South Australisa.
http://ga.water.usgs.gov/edu/adhesion.html
http://www.biology-online.org
Current Concepts On Adhesion. Department of Oral Biology, School of Dentistry, University of Missouri at Kansas City.
Because the composition and structure of
enamel
and
dentin
are substantially different,
adhesion to the two tooth tissues is also different.
Enamel
1- Inorganic (96%) and organic (4%) materials.

2- Avascular, Brittle with a smooth surface.

3- Prepared enamel surface expose rods in tangential, oblique, and longitudinal planes.

4- Homogeneous.
Dentin.
1- Inorganic (70%) and organic (30%) materials.

2- Vascular, highly permeable tissue.

3- more complex and variable than enamel.

4- Heterogeneous.
Factors Affecting Adhesion to Tooth Tissue
The strength and durability of adhesive bonds depend on several factors. Important factors may include:
Physicochemical properties of the adherent and the adhesive.
The structural properties of the adherend.
SURFACE ENERGY
SURFACE TENSION
Wettability
The oral environment:
which is subject to moisture, physical stresses, changes in temperature and pH, dietary components, and chewing habits, considerably influences adhesive interactions between materials and tooth tissues
Dental adhesives
An adhesive:
is any substance that, when applied to the surfaces of materials, binds the surfaces together and resists separation.
Adherend:
A material substrate that is bonded to another material by means of adhesives.
Ceramic
Enamel
Adherent:
a substance that is bonded to a subject by an adhesive.
e.g. Enamel, dentine, Alloy, ceramic
e.g. Adhesive resin
e.g. Resin Composite Ceramic, Acrylic
resin
Mechanical adhesion
Chemical adhesion
Electrostatic adhesion
Diffusive adhesion
Rawan Ahmed Aldajan
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