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Demi Plus Light Curing System

Kerr Corporation

Consultants’ Comments

  • “Easy to use, multiple curing capabilities, intense light, solid charging station.”
  • “Ease of use in the mouth because of the size and rotation of the light.”
  • “I liked longer tip – easier to reach posterior teeth.”
  • “Beeps are too loud.”
  • “The buttons for the timer and the on/off switch are so close that it is easy to push the wrong one.”
  • “Have an option for no sound.”


The Demi Plus Light Curing System is a visible LED light-curing unit intended for polymerization of light-cured materials. It is powered by Demetron Technology and has a high-performance thermoplastic polyester resin exterior. The Demi Plus is cordless and designed to be lightweight, yet durable, chemical resistant, impact resistant, and able to withstand extreme temperatures. The Demi Plus employs PLS Technology (periodic level shifting), which shifts the output intensity from 1,100 mW/cm2 to a peak of 1,330 mW/cm2 multiple times throughout the curing cycle. PLS Technology drives cool, continuous high output for a true five-second cure without generating excess heat. The 8 mm Extended Turbo Light Guide, which is included, improves access for posterior procedures; seven other light guides are available for purchase. The light has a life of 300 full charge/recharge cycles. A fully charged battery will yield 500, five-second cures. Recommended curing times are: universal composite shades A3 and lighter (2 mm depth) – five seconds; shades A3.5 and darker – 10 seconds; bonding agents, universal luting cements and self-etch, self-adhesive cements – five seconds. The Demi Plus LED Light Curing System comes with a three-year warranty. The kit contains: 120v Demi Plus LED handpiece, 8 mm Turbo Extended Light Guide, lithium ion battery pack, battery charger, power supply, two protective light shields, manufacturer’s instructions, and product care tips. Demi Plus LED Light Curing System was evaluated by 11 consultants in 570 uses. It received a 96% rating.

Clinical Observations

Manufacturer’s Instructions

The manufacturer’s instructions were rated as good.

Handpiece Design and Ergonomics

This light is an ergonomic hybrid between a pen-style and a pistol-grip light. The slight angle in the handle allows a comfortable position to grasp the light and trigger the on/off button. Consultants liked the feel and grip of the handpiece. The buttons for the timer and the on/off switch are positioned close together, and it is possible to push the wrong one.

Ease of Use/Ease of Access in the Mouth

Ease of use and ease of access to the mouth were rated very good. The longer tip makes it easier to reach posterior teeth. The light guide rotates 180° for positioning from any angle.

Ability to Cure Materials

Consultants rated the ability to cure a variety of materials as excellent.

Patient Comfort

Patient comfort was rated very good with no reports of excessive heat.

Noise Level

Nearly all of the consultants reported that the audible tones every five seconds were too loud. An option for a volume control was suggested.

Docking Station /Battery Life

Most consultants docked the light in the charging station between uses, and the battery never became fully discharged. The station contains two sockets for charging, and the light is stable when docked. Consultants rated the time required to charge the battery and the battery life as excellent.

Ease of Cleaning/Disinfection

Ease of cleaning and disinfection were rated very good to excellent. The manufacturer recommends disinfection by wiping with a product containing less than 20% alcohol.


Thirty-six percent of consultants reported that Demi Plus LED Light Curing System was better than their current light-curing unit and 46% reported that it was equivalent. Seventy-three percent would switch to Demi Plus LED Light Curing System and 91% would recommend it.

Clinical Tips

  • Charge the light for 16 hours before first-time use.

  • Place the head of the light on a 90-degree angle to the surface being cured to insure a full cure.