Clinical guidelines for photocuring restorative resins

Article Abstract:

The polymerization of light-cured composite resins is affected by the intensity of the light source, the duration of exposure, and the characteristics of the restorative material. Most new curing units emit light of adequate intensity, although the output may diminish over time. Dentists must test light sources regularly with a dental radiometer to ensure proper intensity. For optimal curing, clinicians should hold the light tip within 6 millimeters (mm) of the restoration surface for sixty seconds. Because the thickness of the overlying restoration affects curing, dentists should light cure restorations in increments no greater than 2 mm. Dark shades of restorative material and small filler particles reduce light penetration and decrease the depth of cure.

Standards, Oral surgery, Curing

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Assessing the effect of extraneous light on photoactivated resin composites

Article Abstract:

Photoactivated dental resins begin curing when exposed to operatory light, but may effectively be protected with a blue-blocking light shield. Photoactivated resins used in cosmetic tooth restoration do not cure until exposed to a special light, so dentists may manipulate them without premature hardening. Researchers tested three resins to determine the effect of extraneous light on curing rates. Ten minutes exposure to operatory light caused 70-80% curing. Fluorescent room light had no effect. Shielding operatory lights with blue-light shields prevented premature curing.

Health aspects, Lighting, Dental offices, Photochemical research

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The effect of autoclaving on energy transmission through light-curing tips

Article Abstract:

Dentists should polish their light-curing tips after autoclaving them to remove mineral build-up on the tips. Researchers sterilized light-curing tips up to 25 times and measured the amount of light the tip could transmit after autoclaving. After just three sterilizations, the light transmission through the tip was reduced 50%. This would result in light intensity too low to properly cure restorations. Polishing the tip to remove the mineral build-up restored the light intensity to normal.

Evaluation, Dental equipment and supplies, Dental equipment, Sterilization (Disinfection), Light sources

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