Use of different light-curing units in setting of dental restorative materials

The resin based filling materials were introduced in dentistry at the end of the 1940s. Poor color stability, low stiffness, lack of adhesion to tooth structure were the major drawback of this class of restorative material. Polymerization shrinkage is one of the challenges wh1th needs improvement of this material to many methods were developed. Light curing units which were the major breakthrough and the energy efficiency of the different light sources have also been discussed