Polymerization shrinkage of composite resins using plasma-arc photocuring.
When composite resins are photocured, they undergo a certain degree of polymerization shrinkage. A new method utilizes plasma-arc photocuring instead of conventional visible light. The purpose of this in vitro investigation was to compare the amount of linear shrinkage that occurs when a hybrid composite resin is cured using three different plasma-arc light (PAL) sources. There was no significant difference between the three groups and a halogen light control in the amount of shrinkage of the hybrid composite resin. In terms of resin shrinkage values, using a PAL is no different than using a conventional halogen curing light. However, even though the curing intensity is increased, the shorter curing times may result in a reduced depth of cure.
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University of Washington School of Dentistry, Seattle, USA.
Nicholls
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D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D004867:Equipment Design; D006244:Hardness; D006801:Humans; D007834:Lasers; D008027:Light; D008029:Lighting / Q000295:instrumentation; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties
D003188:Composite Resins; D011108:Polymers