Re: CHEMICAL STRUCTURE OF COMPOSITE

[Anonymous]

Composite resins have a notorious reputation for shrinking upon curing, however, uses as a dental restorative material focus 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.[3] In the field of dental restorative materials, reduction of composite shrinkage is a "hot topic".[according to whom?] Soon to be introduced are patent pending, is a safe, non-leaching antimicrobial agent which minimizes recurrent decay of the tooth and reduces the harmful effects of micro-organisms and which some may cause gingivitis and periodontitis (periodontal disease).