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Q & A Curing lights

What about the increased shrinkage of the composit when you fast cure? NO, it is a widespread misconception. Shrinkage is only determined by the material. 
Many confuse shrinkage with strain in the material. In priciple all materials that cure, should cure slowly. It is however not the difference between 1 and 20 sec, but it should rather be many minutes or hours. Another question is if micro-strain is clinical relevant at all? A higher micro-strain theoretically could lead to fracture of the filling. However does that happen to modern composites? Of the thousands, if not millions of fillings cured with fast curing lights, none have been reported factured.
   
Do you need to build up in  layers when the curing dept is 6mm+?  The rationale behind layered build-up is not related to the curing depth, so arguments for that are the same as before high intensity lights.
   
Do you not risk damaging the pulp when the lioght is so powerfull? Heating of the pulp and/or tooth structure as such is dependend of the used energy. Even if the light has a high out-put power it is used only for a few seconds so the energy is low, as energy is power x time. It is however easy to test, and Dental Advisor has done that, see Press.
   
What then about the gingiva? You cannot damage the pulp, but that does not mean that you should not be carefullwhen getting close to the gingiva with the light. You will not make damages because of the low energy, but the high intensity out-put can be felt - a little like a needle prick. 
Therefore always use the blunt tip if you cure composite right next to the gingiva. Place the tip next to teh composite, then the patient canot feel a thing, that is guaranteed!
 
 


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