Bond composite restorations dentin

The durabflity of bonds formed by bonding agents to enamel and dentine is critical to the clinical success of bonded composite restorations. Many studies have concentrated on shortterm results only, typically as short as 24 h, and have neglected the fact that these bonds change with time. This is caused by a variety of factors (Breschi et al. 2008). 

Glass-ionomer cements have taken a major place in dental treatments as restorative filling materials and also in a range of more adhesive applications due to their ability to bond to both dentine and composite fillers. Acid-etching techniques are well established for the bonding of resins to enamel. 

Ritts, A.C. et al. (2010) Dentin surface treatment using a non-thermal argon plasma brush for interfacial bonding improvement in composite restoration. Ear. J. Oral Set, 118 (5), 510-516. 

The demand for aesthetic dental restorative materials continues to increase and may be the most important criterion for the promising future of the aesthetic polymeric composite resins. As the physical, mechanical, and wear properties of these materials improve, their use in dentistry will expand. The acid-etching of dental enamel [20] and dentin bonding procedures [21] will allow for conservative cavity preparation and the preservation of healthy tooth structure. 

A combination of modified features of the last-named two bonding systems is realized in an adhesive applieation known as the Kanca technique, in which dentin and enamel pre-treatment by phosphorie acid etching is followed by the consecutive layering of NTG-GMA, PMDM, and HEMA-bis-GMA adhesive resins, onto which the restorative is placed by conventional manipulation. Low microleakage, and composite shear bond strengths to enamel/dentin at the 18-MPa level, have been reported [54]. 

Adhesion of restorative dental biomaterials to tooth substrates is primarily based on micromechanical interlocking of resin monomers to the components of the hard tissue. In addition to micromechanical retention, chemical bonding can be achieved via functional monomers, which are able to chemically and mechanically bond to the tooth [10, 11]. While commonly classified as generations by industry, the most appropriate way to classify the current adhesive systems is by the dentin surface treatment and application techniques. The application techniques recommended by manufacturers is greatly influenced by the composition of the adhesive polymer [12]. A summary of the current adhesive systems is shown in Table 9.1. 

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