The bonding of composite resin to moist enamel.
OBJECTIVE
To determine the effect on the bond strength of modern dentine bonding agents to etched enamel of surface contamination with water.


METHODS
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).


CONCLUSIONS
Etched enamel should be rehydrated routinely prior to bonding composite resin to its surface using a water displacing dentine bonding system.
Walls
A W
AW
The Dental School, Newcastle upon Tyne. a.w.g.walls@ncl.ac.uk
Lee
J
J
McCabe
J F
JF
D000134:Acid Etching, Dental; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D017220:Dentin-Bonding Agents; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D008963:Molar; D011109:Polymethacrylic Acids; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength; D014867:Water
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C438310:Margin Bond; D008689:Methacrylates; C428805:OptiBond SOLO; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; C041330:Scotchbond