Journal of Conservative Dentistry
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Year : 2003  |  Volume : 6  |  Issue : 3  |  Page : 103-106

Intensity Of The Light Cure Units – A Survey In The City Of Chennai



Correspondence Address:
Pramod Menon


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Source of Support: None, Conflict of Interest: None


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Recently, the importance of light source intensity has been in the forefront of clinical practice. It is generally accepted that an intensity reading of 400 mW/cm2 or greater in the proper wave length range is needed for complete polymerization of material up to 2 mm depth with an optimal exposure time of 40 seconds. In the present study the intensity of light curing units were checked among 50 private practitioners and the effect of its variation on the compressive strength was measured. After checking the intensity with a radiometer, a posterior composite resin (Solitaire, Shade A30 was cured in a plastic mould of 4 mm depth and 5 mm diameter by placing the composite in 2mm increments. After curing. It was stored in distilled water and later compressive strength of the cured composite was measured with an Instron universing testing machine with 0.2mm/minute cross head speed. The result showed a decrease in the compressive strength with reduction in the intensity of light cure unit. To conclude, there is a relation between intensity and compressive strength and that the compressive strength reduced with decreased intensity of the curing light.


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