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Wednesday, January 23, 2008

Operative Dentistry MCQ 05

Wednesday, January 23, 2008

Which of the following advantages for the curing lights are true?


  1. Quartz-Tungsten-halogen curing lites- 90% of the light produced is suitable for curing. Output ranges from 400-800 mW/cm2.


  1. Plasma arc curing units-PAC- curing times can be as low as 3-10 seconds. This produces a much more rapid polymerization resulting in decreased polymerization stresses and stronger bond strengths.


  1. Laser curing lights-curing times can be as low as 3-10 seconds.


  1. Light emitting diode (LED) lights-Allows one to generate the appropriate wavelength in a narrow spectrum and curing cycle.


  1. Stepped cure lights-may allow the newly formed polymer network to stress-relax and eliminate strains before completion of the curing cycle.


a. 1,2,3 are true

b. 2,3,4 are true

c. All the above are true

d. All the above are false

e. 3,4,5 are true



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