Author/Editor     Gašpirc, B; Skalerič, U
Title     Morphology, chemical structure and diffusion processes of root surface after Er:YAG and Nd:YAG laser irradiation
Type     članek
Source     J Clin Periodontol
Vol. and No.     Letnik 28
Publication year     2001
Volume     str. 508-16
Language     eng
Abstract     Objectives: The aim of this in vitro study was to evaluate the effects of Er:YAG and Nd:YAG lasers on morphology chemical structure and diffusion processes of the root surface. Material and methods: 60 root samples were irradiated for 1 min each either with 60 mJ/p, 80mJ/p and 100mJ/p using Er:YAG laser or with O.SW, 1.OW and 1.SW using Nd:YAG laser. Scanning electron microscopy (SEM) was used to determine the morphology, infrared (IR) spectroscopy to assess the alterations in chemical structure and one dimensional electron paramagnetic resonance imaging (1-D EPRI) was used to estimate the diffusion coefficients in dental root samples. Results: Er:YAG laser treatment resulted in deep crater formation with exposed dentin. Morphological alterations of root surface after Nd:YAG laser irradiation included cracks, crater formation, meltdown of the root mineral and resolidified porous globules formation. Er:YAG laser failed to alter the intensity of Amide peaks I, II or III. In contrast, treatment with Nd:YAG laser, using the highest power setting of 1.SW, reduced the intensity of Amide peak II and III in comparison to the control. The diffusion coefficients were increased significantly in all Er:YAG and Nd:YAG treated root samples. Conclusion: This study demonstrated that Er:YAG laser influences only on morphology and diffusion processes of root surfaces, while Nd:YAG laser also alters the chemical structure of root proteins.
Descriptors     LASER SURGERY
TOOTH ROOT
TOOTH PERMEABILITY
DENTIN
ERBIUM
NEODYMIUM
PROTEIN DENATURATION
MICROSCOPY, ELECTRON, SCANNING
SPECTROPHOTOMETRY, INFRARED
ELECTRON SPIN RESONANCE SPECTROSCOPY