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PAC light disadvantage

 
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Sun Oct 12, 2008 11:18 am    Post subject: PAC light disadvantage Reply with quote

Dent Mater. 2008 Aug 28. [Epub ahead of print] Links
Insufficient cure under the condition of high irradiance and short irradiation time.Feng L, Carvalho R, Suh BI.
Research and Development, Bisco Inc., 1100 West Irving Park Road, Schaumburg, IL 60193, USA.

OBJECTIVES: To investigate if and why a plasma arc curing (PAC) light tends to undercure methacrylate-based resins or resin composites. METHODS: Model dimethacrylate resins, commercial dental adhesives, and commercial resin composites were cured using a PAC light and a halogen light with the similar radiant exposures but different combinations of irradiance and irradiation time. The degree of double bond conversion (DC) was measured with FTIR spectroscopy and analyzed as a function of radiant exposure. RESULTS: The PAC light produced a lower DC than the halogen light for the model resin with the lowest viscosity and for three of the four adhesives. With a high irradiance, the PAC light could cure three of the four composites as thoroughly as its halogen counterpart. When the irradiance was reduced, however, three composites yielded a lower DC. CONCLUSIONS: Insufficient cure by PAC lights or any curing lights with very high irradiance is likely to happen when too short an irradiation time is used. It is because under higher irradiance, the lifetime of free radicals is shorter.
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