Dr. I. asks:
My understanding of composite chemistry is that every composite shrinks when it is light cured. I read an advertisement that Filtek LS [3M ESPE] has less than 1% polymerization shrinkage which is the lowest of all the composites. I do not know anything about its aesthetics so I do not know how it competes in this way with the other composites on the market. Is there good research to back up this claim of lowest polymerization shrinkage? Does this really make that much difference? Has anybody actually tried this and do you see a difference?
According to 3M:
“Any time you restore a patient’s tooth, you strive to achieve a “perfect margin” – a smooth connection between the tooth structure and restoration without interruptions or gaps. Even if your technique is perfect, achieving lasting marginal integrity is a challenge because all composites shrink.
Shrinkage is intrinsic to resin chemistry – which is why, to date, no methacrylate-based composite has solved the shrinkage problem.
The Filtek LS Low Shrink Posterior Restorative System is based on 3M ESPE’s latest product innovation: silorane chemistry. This scientific breakthrough results in the lowest volumetric shrinkage to date. The silorane-based composite works with a dedicated self-etch adhesive.
Dedicated adhesive provides excellent bond strength.
The Filtek LS Low Shrink Posterior Restorative System combines the lowest-shrinking silorane-based composite with a dedicated two-step, self-etching bonding system:
3M™ ESPE™ LS System Adhesive Self-Etch Primer and Bond. It offers excellent bond strength to enamel and dentin, and is the one and only adhesive formulated to provide optimal bonding with such an extraordinarily low-shrinking composite.”