Abstract
It has been proposed that a resin coating can serve as a means to protect dental structure after preparation of the tooth for indirect restorations, sealing the exposed dentin. The resin coating is applied on the cut surfaces immediately after tooth preparation and before making an impression by assembling a dentin bonding system and a flowable composite. Resin coatings minimize pulp irritation and improve the bond strength between a resin cement and tooth when bonding the restoration to tooth. Recently, thin-film coating dental materials based on all-in-one adhesive technology were introduced for resin coating of indirect restorations. The thin coating materials are applied in a single clinical step and create a barrier-like film layer on the prepared dentin. The thin coatings play an important role in protecting the dentin from physical, chemical, and biological irritation. In addition, these thin-film coating materials reportedly prevent marginal leakage beneath inlays or crown restorations. In light of the many benefits provided by such a protective layer, these all-in-one adhesive materials may therefore also have the potential to cover exposed root dentin surfaces and prevent caries formation. In this paper, recent progress of the dental coating materials and their clinical applications are reviewed.
Highlights
Dentin is the main hard substance of the tooth which is covered by enamel on the crown and cementum on the root
A new zone, the so called “acid-base resistant zone” (ABRZ) beneath the hybrid layer was found adjacent to outer lesion (OL) (Figure 3)
The ABRZ should be ascribed to an effective diffusion of the acidic monomer of the self-etching system beyond the hybrid layer, and their chemical bonding potential with apatite as the substrate
Summary
Dentin is the main hard substance of the tooth which is covered by enamel on the crown and cementum on the root. It is possible to lose sight of this fact and focus entirely on the restorative treatment of the lesion, thereby failing to treat the underlying cause of the disease. Those parts of dentin which are already infected by the bacteria and lost their structural integrity (known as caries-infected dentin) should be removed in the procedure of preparing the tooth for a restoration (Figure 1). (b) in the conventional restorations, sound dentin was sacrificed to obtain mechanical retention of the restorations; (c) minimal cavity preparation can be achieved for direct composite restorations by using adhesive systems
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