Meta Description: Adhesive restorations become a very important part while doing full mouth rehabilitation case. To achieve clinical success with such restorations, it is of clinical importance to ensure good bonding between this restoration and tooth surface. Bonding between dentin and composite resin is not strong enough to overcome the stress of polymerization shrinkage. Fluid in dentin tubules reduces the stability of composite resin to dentin bond.

Adhesive restorations become a very important part while doing full mouth rehabilitation case. To achieve clinical success with such restorations, it is of clinical importance to ensure good bonding between this restoration and tooth surface. Speaking about adhesion to tooth substances, we need to distinguish the difference between enamel and dentin. Enamel is mainly composed of hydroxyapatite crystals and bond between enamel and resin has been one of the strongest bonds achieved within tooth substance. Bonding to dentin is far more challenging as it is composed of apatite crystals embedded in collagen matrix.

Lower bond strengths to dentin are the result of number of factors which includes dentin contains less mineralized tooth structure and more water than does the enamel, the presence of smear layer makes wetting of dentin by the adhesive more difficult. Even when good wetting occur, stress cause by polymerisation shrinkage of resin can pull the resin away from tooth structure causing microporosity. Bonding between dentin and composite resin is not strong enough to overcome the stress of polymerization shrinkage. Fluid in dentin tubules reduces the stability of composite resin to dentin bond.

For more details: https://www.omicsonline.org/open-access/evaluation-of-the-effect-of-tooth-surface-wetting-and-bond-strength-of-compositean-in-vitro-study-jimds.1000111.php?aid=22767

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