Bonding And Bonding Agents Flashcards
What is bonding ?
Bonding and adhesion comprise a complex set of physical, chemical, and mechanical mechanism that allow the attachment and binding of one substances to another.
Three essential functions of dental bonding systems
- provides resistances to separation of an adherend substrate (i.e enamel, dentin, metal, composite, ceramic) from a restorative or cementing material.
- distributes stress along bonded interfaces
- seals the interfaces via adhesive bonding between dentin and/or enamel and the bonded material, thus increasing resistances to micro leakages and decreasing the risk for postoperative sensitivity, marginal staining, and secondary caries.
Principle advantages of bonding?
- retention
- conservative of tooth structure
- elimination of marginal micro leakage
- reinforcement of remaining tooth structure
- increasing the clinical life time of restoration
What is acid-etching?
Process of roughening a solid surface by exposing it to an acid and thoroughly rinsing the residue to promote micromechanical bonding of an adhesive to the surface.
What is Adhesion?
A molecular or atomic attraction between two contacting surfaces promoted by the interfacial force of attraction between the molecules or atoms of two different species; adhesion may occurs as physical adhesion, chemical adhesion, mechanical adhesion or a combination of all types
What is adhesive ?
Substances that promotes adhesion of one substances or material to another.
What is adherend?
A material substrate that is bonded to another materials by means of an adhesive.
What is adhesive bonding?
Process of joining two materials by means of an adhesive agent that solidifies during the bonding process.
What is dentin bonding?
The process of bonding of a resin to conditioned dentin
What is dentin bonding agents?
A thin layer of resin between conditioned dentin and the resin matrix of a composite
What Is dentin conditioner?
An acidic agent that dissolves the inorganic structure in dentin, resulting in a collagen mesh that allow infiltration of an adhesive resin.
What is hybrid layer?
An intermediate layer of resin,collagen,and dentin produced by acid etching of dentin and resin infiltration into the conditioned dentin.
What is microleakage?
Flow of oral fluid and bacteria into the microscopic gap between a prepared tooth surface and a restorative material.
What is primer?
A hydrophilic, low viscosity resin that promotes bonding to a substrate, such as dentin.
What is resin tag?
Extension of resin that has penetrated into etched enamel or dentin.
