Laser systems have been developed for the cutting of dental hard tissues. In order to evaluate the efficiency of Er,Cr:YSGG laser system used in conjunction with an air-water spray for cavity preparation this study was accomplished at University of Dentistry of the University of Pacific in San Francisco, United States; The authors randomly selected subjects for cavity preparation with conventional air turbine/bur dental surgery or an Er,Cr:YSGG laser-powered system using a split-mouth design. They prepared Class I, III and V cavities, placed resin restorations and evaluated subjects on the day of the procedure and 30 days and six months postoperatively for pulp vitality, recurrent caries, pain and discomfort, and restoration retention. Sixty-seven subjects completed the study. There were no statistical differences between the two treatment groups for the parameters measured. In conclusion the Er,Cr:YSGG laser has been shown to be effective for  Class I, III and V cavity preparation and restoration replacement. J Am Dent Assoc; 131(6):777-85, 2000 Jun

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