title: The effect of CO(2) laser on the microhardness of human dental hard tissues compared with that of the high-speed drill.
abstract: OBJECTIVE
  The purpose of this study was to examine the effect of 9.6-microm CO(2) laser energy on the microhardness of human dental hard tissues compared with that of high-speed drill cavity preparation, and to determine the applicability of this laser in clinical treatment.
  
  
  METHODS
  A total of 10 caries-free human single-rooted teeth were used for this study. The crowns were resected and the roots were longitudinally sectioned into two halves. In each slice one half of the enamel and the dentin were treated with 9.6-microm CO(2) laser irradiation, and in the other half the enamel and dentin were treated with a high speed drill, each half for 3 s. Following treatment, the samples were polished and tested for microhardness. The results were compared using analysis of variance.
  
  
  RESULTS
  Statistically significant differences in dentin microhardness were found between specimens treated with 9.6-microm CO(2) laser energy as compared with specimens treated with the high-speed drill (p = 0.0156). There were no statistically significant differences in enamel microhardness between specimens treated with 9.6-microm CO(2) laser energy and specimens treated with the high-speed drill.
  
  
  CONCLUSIONS
  The clinical use of 9.6-microm CO(2) laser energy for cavity preparation should be further analyzed, and compared with different types of lasers used in dentistry, such as 10.6-microm CO(2) or Er-YAG.
authors.affiliation: Department of Endodontics, Hebrew University, Hadassah School of Dental Medicine, Jerusalem, Israel.
authors.forename: Iris
authors.initials: I
authors.lastname: Slutzky-Goldberg
authors.forename: Oren
authors.initials: O
authors.lastname: Peleg
authors.forename: Reuven
authors.initials: R
authors.lastname: Liberman
authors.forename: Adam
authors.initials: A
authors.lastname: Stabholtz
authors.forename: Joshua
authors.initials: J
authors.lastname: Moshonov
mesh_terms: D001641:Bicuspid / Q000528:radiation effects; D003737:Dental Cavity Preparation; D003804:Dentin / Q000528:radiation effects*; D006244:Hardness / Q000528:radiation effects*; D006801:Humans; D054020:Lasers, Gas; D008963:Molar / Q000528:radiation effects; D046509:Tissue Culture Techniques