Q&A of LED Curing Light Unit (2/2)
Something you need to know when using curing light.
About stimulation of the pulp
Q: Fixed light source will be injured to the living pulp teeth, right?
A: Curing light unit irradiation will produce the problem of heating, for high power light-curing unit can not be continuously irradiated teeth, generally irradiation 10s pause 1 ~ 2s, or irradiation at the same time through the air gun to reduce the temperature.
Q: When stabilizing the light guide tips, generally do a small movement, it there a point of irritation to the pulp?
A: Moving the light guide tip when irradiating will lead to the unstable output of light intensity, which will affect the effect of light curing. If you are worried about pulp irritation, you can stop for 2s at 10s or use an air gun to blow cold air to cool down during the irradiation.
Q: Will the lightward shrinkage of the resin occur further after curing by light again?
A: If the material has been adequately light cured according to the product description, it will not shrink further if it is illuminated again, but please pay attention to whether the temperature increase stimulates the pulp and soft tissues.
Q: If the light guide bar is too small and multiple lightings are required, does this have a significant impact on resin polymerization?
A: The light intensity required to meet the material will not affect the polymerization of the resin, but please note that the light intensity will be affected if the light is fixed in one position for 10s and in another position for 10s, rather than moving all the time.
Other questions
Q: In orthodontic bonding brackets, how to place the light guide bar without the existence of clamping angle?
A: For ceramic brackets, the brackets can be irradiated directly vertically; for metal brackets, multi-angle irradiation is required, with near-medium and far-medium irradiation respectively.
Q: What is the direction and angle of binder irradiation?
A: Vertical irradiation, for complex cavity shape need multi-angle irradiation.
Q: After light curing, when adjusting together, found that the hardness is not enough, after adjusting together, is it necessary to irradiate?
A: This situation indicates that the material curing is not sufficient, you need to pay attention to whether the operation in accordance with the instructions of the material; pay attention to the maximum filling thickness and the required light intensity, light time, and test the light curing lamp light intensity is appropriate.
Q: What is the role of light in 3M U200 bonding material? Can it pass through the crown when gluing the crown?
A: Dual-curing materials, light to obtain a certain initial strength, but also reported in the literature, light-initiated polymerization after the chemical curing more fully to improve the material strength, edge fit, improve the ability to resist staining; generally for the crown, inlay or high inlay bonding will choose dual-curing cementation materials to ensure adequate curing and bonding strength, the degree of light through the crown and other restorations depends on the permeability of the crown material and thickness.
Q: Are there any stunts when irradiating fiber piles?
A: Use a fiber pile with good light transmission, use a double-cured cementum, and ensure a light exposure time of 40s.
Q: Which position should be irradiated first? Close to the tooth or away from it?
A: If the light guide head is large enough, irradiate the center of the material vertically to finish the light at once; if the light guide head is not large enough, you can irradiate it in stages to ensure that every side of the material is illuminated.