33: Bonding to dentin


Bonding to dentin

Figure 33.1 Schematic representation of the coupling action of a dentin-bonding agent providing adhesion between the resin matrix and tooth surface.


Figure 33.2 Bifunctional HEMA molecule: methacrylate group can bond to resin, whereas the active end can react with dentin substrate.


Figure 33.3 Schematic diagram of 4-META and its bond to calcium in hydroxyapatite of conditioned dentin.


Figure 33.4 Schematic diagram of formation of a hybrid layer on dentin.


Box 33.1 Common dentin conditioning agents
10% phosphoric acid
35–37% phosphoric acid
17% ethylene diamine tetraacetic acid (EDTA)
10% maleic acid
10% citric acid + 3% FeCl3

Table 33.1 ;Developments (generations) in dentin-bonding systems

Development Characteristics
First generation Bifunctional resin bonded to calcium in hydroxyapatite
Second generation Halophosphorous resin esters bonded to hydroxyapatite
Third generation Partial smear layer removal, hydrophilic monomers, resin adhesive
Fourth generation Three steps (conditioning, priming, and bonding) and three solutions
Fifth generation
   Single bottle Separate conditioner; primer and adhesive combined
   Self-etching primers Conditioner and primer combined; separate adhesive
Sixth generation Conditioner, primer, and adhesive combined (single solution)
Seventh generation No-mix, self-etching systems

Table 33.2 Dentin-bonding agents

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Jan 1, 2015 | Posted by in Dental Materials | Comments Off on 33: Bonding to dentin
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