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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
Published on: July 21, 2014
The bonding of composite resin to moist enamel
1The Dental School, Newcastle upon Tyne. a.w.g.walls@ncl.ac.uk
Objective:
To determine the effect on the bond strength of modern dentine bonding agents to etched enamel of surface contamination with water.
Design:
Fifteen bond strength measurements were made for bonds prepared to both moist and dry etched enamel for each of three test and one control materials.
Results:
For two materials (Scotchbond 1 and Prime and Bond 2.1) the bond strength was not affected by the presence of water on the etched enamel surface. A mean bond strength in excess of 25 MPa was achieved for both materials under all conditions. One material (Optibond Solo) showed a 30% increase in bond strength when bonds were formed under wet condition (21.10 MPa compared with 15.35 MPa). The bond strength of the control material, a conventional unfilled bonding resin, decreased markedly with aqueous contamination (9.14 MPa compared with 26.75 MPa).
Conclusion:
Etched enamel should be rehydrated routinely prior to bonding composite resin to its surface using a water displacing dentine bonding system.
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