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Adhesive resin should create the so-called hybrid layer (consisting of a collagen network exposed by etching and embedded in adhesive resin). This layer is an interface between dentin and adhesive resin and the final quality of dental restoration depends greatly on its properties.
Adhesive dentistry is a branch of dentistry which deals with adhesion or bonding to the natural substance of teeth, enamel and dentin.It studies the nature and strength of adhesion to dental hard tissues, properties of adhesive materials, causes and mechanisms of failure of the bonds, clinical techniques for bonding and newer applications for bonding such as bonding to the soft tissue. [1]
Primers allow the dentin's collagen fibers to be "sandwiched" into the resin, resulting in a superior physical and chemical bond of the filling to the tooth. Indeed, composite usage was highly controversial in the dental field until primer technology was standardized in the mid to late 1990s.
They also reduce the bond strength of both total and self-etching adhesive systems to dentin if used before an indirect bonding restoration. [36] Another report shows that there is no difference in bond strengths of self-adhesive resin cements to dentine between prior application of eugenol free and eugenol containing provisional cements. [37]
10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP, MDP Monomer) is a chemical compound used in dental adhesive materials. This organophosphate monomer was developed in 1981 by the Japanese company Kuraray for the preparation of dental adhesion polymers [ 1 ]
This is because composite resins bind to enamel (and dentin too, although not as well) via a micromechanical bond. As conservation of tooth structure is a key ingredient in tooth preservation, many dentists prefer placing materials like composite instead of amalgam fillings whenever possible.