Preliminary investigation of a novel carbon dioxide laser for applicationsin dentistry

Background and Objective: A novel pulsed CO, laser was examined for its abi lity to ablate hard dental tissues. Study Design/Materials and Methods: Lased human enamel surfaces were viewed using light and scanning electron microscopy for evidence of adverse struc tural changes. In vitro shear bond strength tests were conducted on composi te resin bonded to lased enamel surfaces and compared with conventionally p repared specimens. A thermal camera was used to monitor temperature changes during cavity preparation in tooth slabs to assess likely changes to the d ental pulp. Results: No charring or surface cracks were observed on lased enamel surfac es using both microscopic techniques. Bonding of the lased enamel surfaces to composite resin was not significantly different from the acid-etched con trol group. For cavities with a remaining dentine thickness of less than 1 mm, the temperature rise was less than 6 degrees C. Conclusion: A novel pulsed CO, laser shows promise for cutting cavities in teeth. Lasers Surg. Med. 26:262-269, 2000 (C) 2000 Wiley-Liss, Inc.