direct composite and resin cement.
6
Pre-curing the adhesive agent
increased the bond strength for both direct composite and resin
cement. However, pre-curing was not recommended clinically for
use with resin cement since the film thicknesses measured were
120 microns and considered too large to be clinically acceptable.
Universal adhesives have reported film thicknesses less than
10 microns. This would seem to have a significant margin for error
for maintaining a film thickness that would not create a misfit in
the seating of the restoration if it were pre-cured. In spite of in vitro
evidence on improved bond strengths by pre-curing, there is no
clinical evidence that it provides a clinical improvement. In fact,
the published clinical studies on CEREC restorations invariably are
based on simultaneously curing the adhesive and resin cement.
Universal adhesives offer an improvement in convenience and
efficiency for adhesive bonding. The ability to use them with self-
etch, selective-etch and total-etch modes is one of the primary
advantages to their clinical use. The additional functionalmonomers
create chemical bonds to both the tooth and restorative materials
with a film thickness that is expected to not interfere with complete
seating of indirect restorations, even if they are pre-cured.
For questions and more information, Dr. Fasbinder can be reached at
REFERENCES
1 Alex G. Universal Adhesives: the Next Evolution in Adhesive Dentistry? Compendium
2015 Jan; 15-26.
2 Tay FR, Pashley DH, Suh B, et al. Single-step, self-etch adhesives behave as permeable
membranes after polymerization. Part I. Bond strength andmorphologic evidence.
Am J Dent. 2004;17(4):271-278.
Perdigao J, Sezinando A, &Monteiro PC. Laboratory bonding ability of a multi-purpose
dentin adhesive American Journal of Dentistry 2012, 25(3) 153-158.
3 HanabusaM, Mine A, Kuboki T, Momoi Y, Van Ende A, VanMeerbeek B, &DeMunck J.
Bonding effectiveness of a new ’’multi-mode’’ adhesive to enamel and dentine Journal of
Dentistry 2012, 40(6) 475-484.
4 Tay FR et al. Bonding of a self-etching primer to non-carious cervical sclerotic dentin:
Interfacial ultrastructure andmicrotensile bond strength evaluation. J Adhes Dent
2000; 2:9-28.
Kwong et al. Micro-tensile bond strengths to sclerotic dentin using a self-etching and
a total-etching technique. DenMater 18:359-369, 2002.
5 Chen L, ShenH, Suh BI. Effect of incorporating BisGMA resin on the bonding
properties of silane and zirconia primers. JProsth Dent 2013; 110 (5): 402-407.
6 Frankenberger R, Sindel J, Krämer N, Petschelt A. Dentin bond strength andmarginal
adaptation: direct composite resins vs ceramic inlays. Oper Dent. 1999; 24:147–155
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