Durable bonds at the adhesive/dentin interface:an impossible mission or simply a moving target?

Abstract

Composite restorations have higher failure rates, more recurrent caries and increased frequency of replacement as compared composite undermines the restoration and leads to recurrent decay and failure. The gingival margin of composite restora tions is particularly vulnerable to decay and at this margin, the adhesive and its seal to dentin provides the primary barrier between the prepared tooth and the environment. The intent of this article is to examine physico-chemical factors that affect the integrity and durability of the adhesive/dentin interfacial bond; and to explore how these factors act synergistically with mechanical forces to undermine the composite restoration. The article will examine the various avenues that have been pursued to address these problems and it will explore how alterations in material chemistry could address the detrimental impact of physico-chemical stresses on the bond formed at the adhesive/dentin interface.

Bonding of universal adhesives to dentine – Old wine in new bottles?

“…Because water is required for hydrolytic degradation of polymeric resins 38,39 and enzymatic degradation of collagen fibrils, 40,41 it is logical to use a water-based tracer solution to probe regions that are permeable to water in resin-dentin interfaces that have been subjected to thermocycling. Based on the present nanoleakage results, the potential of universal adhesives to resist water aging is unlikely to be different from previous generation of dentin adhesives.…”

New Trends in Dentin Bonding: Treatment with chlorhexidine, hyaluronic acid, vitaminc C and green tea

“…The formation of this layer is related to many factors, which include: dentin permeability, the conditioning agents, the conditioning time, the quality of dentin, the humidity, and the adhesive system, the diffusivity of the monomers, the depth of cure and the structural characteristics of the collagen network [23].…”

Can long-term dentine bonding created in real life be forecasted by parameters established in the laboratory?

“…The morphological and physical variations of human dentine bring about difficulties in maintaining durable bonding to that substrate9. Biological and clinical factors such as dentine permeability, disease-modified dentine, and pulpal fluid flow in a living tooth adversely affect adhesion to dentine10.…”