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The effect of Nd:YAG and Er,Cr:YSGG lasers on the microhardness of human dentin

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Abstract

The current investigation determined the microhardness of dentin tissue irradiated with erbium, chromium-doped yttrium scandium gallium garnet (Er,Cr:YSGG) and neodymium-doped yttrium–aluminum garnet (Nd:YAG) lasers. Thirty non-carious human molars were used in this study. Dentin disks were prepared by horizontal sectioning of one third of the occlusal surface. Halves of dentin specimens were irradiated with 3.5- and 4.5-W Er,Cr:YSGG lasers and with a 2-W Nd:YAG laser. The remaining halves served as controls. The microhardness measurements were recorded with a Vickers surface microhardness tester. The results were statistically evaluated by paired t test and one-way ANOVA (p = 0.05). Laser irradiation has significantly reduced the microhardness of dentin within each group compared to its control. Moreover, statistically significant differences were observed among the different groups (p < 0.05). The 3.5-W Er,Cr:YSGG laser produced the greatest reduction in microhardness of dentin followed by 4.5 W and Nd:YAG laser. The differences between all the groups were statistically significant. It was concluded that both laser devices used in this study have resulted in significant thermal damage and subsequent reduction in dentin microhardness values.

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Acknowledgements

The research was generously funded by the Jordan University of Science and Technology and Melbourne University.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, 22110, Jordan

    Wael M. Al-Omari

  2. School of Dental Science, Melbourne Dental School, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, 720 Swanston Street, Melbourne, Victoria, 3010, Australia

    Joseph E. Palamara

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  1. Wael M. Al-Omari
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Correspondence to Wael M. Al-Omari.

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Al-Omari, W.M., Palamara, J.E. The effect of Nd:YAG and Er,Cr:YSGG lasers on the microhardness of human dentin. Lasers Med Sci 28, 151–156 (2013). https://doi.org/10.1007/s10103-012-1094-3

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  • DOI: https://doi.org/10.1007/s10103-012-1094-3

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