Composite Shrinkage
Composite resins are notorious for shrinking upon curing. However, their use as dental restorative materials focuses on low-shrinkage composites. Composite shrinkage can be reduced by altering the molecular and bulk composition of the resin. For example, UltraSeal XT Plus uses Bis-GMA without dimethacrylate and was found to have a shrinkage of 5.63%, 30 minutes after curing. On the other hand, this same study found that Heliomolar, which uses Bis-GMA, UDMA and decandiol dimethacrylate, had a shrinkage of 2.00%, 30 minutes after curing. In the field of dental restorative materials, reduction of composite shrinkage is a "hot topic".
Read more about this topic: Dental Composite
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