Nasim Chiniforush1, Hanieh Nokhbatolfoghahaei1, Abbas Monzavi2, Edris Pordel1, Sajjad Ashnagar3. 1. Laser Research Center of Dentistry (LRCD), Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran. 2. Department of Dental Prosthesis and Implants, Laser Research Center of Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. 3. Department of Periodontics and Oral Medicine, Michigan School of Dentistry, MI, USA.
Abstract
INTRODUCTION: This study aimed to assess the Scanning Electron Microscope (SEM) analysis of tooth surface irradiated by erbium:yttrium-aluminum-garnet (Er:YAG) laser with various parameters. METHODS: Number of 25 extracted human third molars free of caries were used in this study. The teeth were put into 5 groups for laser irradiation as follows: group 1 (power: 0.5 W, Energy: 50 mJ); group 2 (power: 1 W, Energy: 100 mJ); group 3 (power: 1.5 W, Energy: 150 mJ); group 4 (power: 2 W, Energy: 200 mJ); group 5 (power: 2.5 W, Energy: 250 mJ). All samples were prepared by repetition rate of 10 Hz and duration of 230 μs, using a non-contact handpiece at a distance of 4 mm. Then, the samples were prepared for SEM examination. RESULTS: SEM evaluation of every 25 samples, treated by Er:YAG, showed that all groups had exposed dentinal tubules without any melted area or cracks. CONCLUSION: In this study we used SEM to investigate ablated dentine with different parameters of Er:YAG laser energy. Our findings support these conclusions. All powers of laser below 3 W are proper for ablation, and make no cracks.
INTRODUCTION: This study aimed to assess the Scanning Electron Microscope (SEM) analysis of tooth surface irradiated by erbium:yttrium-aluminum-garnet (Er:YAG) laser with various parameters. METHODS: Number of 25 extracted human third molars free of caries were used in this study. The teeth were put into 5 groups for laser irradiation as follows: group 1 (power: 0.5 W, Energy: 50 mJ); group 2 (power: 1 W, Energy: 100 mJ); group 3 (power: 1.5 W, Energy: 150 mJ); group 4 (power: 2 W, Energy: 200 mJ); group 5 (power: 2.5 W, Energy: 250 mJ). All samples were prepared by repetition rate of 10 Hz and duration of 230 μs, using a non-contact handpiece at a distance of 4 mm. Then, the samples were prepared for SEM examination. RESULTS: SEM evaluation of every 25 samples, treated by Er:YAG, showed that all groups had exposed dentinal tubules without any melted area or cracks. CONCLUSION: In this study we used SEM to investigate ablated dentine with different parameters of Er:YAG laser energy. Our findings support these conclusions. All powers of laser below 3 W are proper for ablation, and make no cracks.
Entities:
Keywords:
Dentinal tubules; Er:YAG; Laser; Scanning electron microscopy
Authors: Teresa C D Carrieri; Patricia M de Freitas; Ricardo S Navarro; Carlos de P Eduardo; Matsuyoshi Mori Journal: Lasers Med Sci Date: 2007-01-18 Impact factor: 3.161
Authors: Amir Hossein Mirhashemi; Nasim Chiniforush; Nastaran Sharifi; Amir Mehdi Hosseini Journal: Lasers Med Sci Date: 2018-01-11 Impact factor: 3.161