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Published on: November 9, 2014
[The influence of temperature and curing light units on the microhardness of composite resin]
1Department of Dentistry, Beijing Tongren Hospital, Capital Medical University. Beijing 100730,China. xiaoxiawu@21cn.com
Purpose:
To investigate the effect of different temperature and different light curing units on the hardness of composite resin.
Methods:
Specimens were fabricated from Clearfil AP-X composite resin (Kuraray,Japan)and stored at three different temperature(5degrees centigrade,23degrees centigrade,40degrees centigrade).Then they were cured by a quartz tungsten halogen Translux CL or a second generation LED Elipar FreeLight2. The microhardness of the top and bottom surfaces of the specimens were determined using a digital microhardness tester. Statistical analyses were performed using the two-way ANOVA by SPSS 17.0 software package.
Results:
Whether cured by QTH or LED, the specimens stored at 40degrees centigrade had higher top and bottom hardness value than that stored at the other temperatures(P<0.01). The LED light produced a significantly better hardness on top and bottom surfaces of specimens stored at the three different temperatures(P<0.01).
Conclusions:
The use of pre-warmed composite resins might help to increase the composite resin hardness. Second generation LED is more efficient than halogen light unit.
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