In a recent monthly-featured Q&A in Dental Economics, Dr. Gordon Christensen discusses how to reduce failures in Class II composites. Dr. Christensen argues that curing light/resin-curing is probably the most important factor relative to premature failure.

We all know that curing lights and composites go hand-to-hand. For the curing light, the wavelength emission and light intensity are key. For the composite, the critical factors are the initiators used, shade, optical translucency and any resulting shrinkage.

The guide below highlights Dr. Gordon Christensen’s key findings and connects them with the related factors of Ivoclar Vivadent’s most popular curing light, Bluephase® Style.

Bluephase Style represents the latest in LED curing light technology.  With patented Polywave™ technology to cure all dental materials and a newly designed light probe for easy access to posterior teeth, Bluephase Style provides the ultimate curing experience for you and your patients.

Dr. Christensen said... Why Bluephase Style is the Best Choice
Curing lights should have an output of about 1,000 mW/cm2.  Many do not have this much output. Bluephase® Style has light intensity of 1,100 mW/cm2.

Bluephase-Meter-II

Some dentists have purchased low-cost, foreign-made lights at ridiculously low prices. In CR Foundation research, some of these lights have been found to have both minimal light output and lack of the recommended broad –spectrum wavelength of 400 to 500 nm. Bluephase Style features patented Polywave™ technology, which provides a broadband spectrum of 385-515 nm, which allows you to cure all dental materials on the market today!

Curing-Light-Spectrum-Chart

Lights with narrow-diameter light guides (about 7 mm in diameter) require circular movement of the guide during curing and longer curing time to ensure optimum resin conversion. 10- or 11-mm-diameter light guides are optimum. Bluephase Style has a light guide, which is 10 mm in diameter, to enable a single 10-sec cure.

For optimum cure, the light coming from the device should be in an angulation perpendicular to the resin surface. This is one of the most neglected points, since most of the light guides do not allow this angulation in many clinical locations. Most of the newer lights are being made with a light guide of near 90 degrees from the light device. This angle is far better than those with less angulation because it allows curing the resin with the light hitting the resin perpendicular to the resin surface. The shape and angle of the light probe on the Bluephase Style makes it easy to access tight areas of mouth and steep angles such as lingual surface of lower incisors.