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Quintessence Publishing: Journals: JOLA


The Journal of Oral Laser Applications

Edited by Prof Dr Andreas Moritz and Prof G. Lynn Powell

Official publication of the European Society for Oral Laser Applications

ISSN (print) 1473-7809 • ISSN (online) 1867-5611

Spring 2006
Volume 6 , Issue 1

Pages: 23-28
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Compositional and Structural Changes of Human Dentin Following Er,Cr: YSGG Laser Irradiation In Vitro

Hossain, Mozammal/Kinoshita, Jun-Ichiro/Yamada, Yoshishge/Jahan, K. M. Rownak/Nakamura, Yukio/Matsumoto, Koukichi

Purpose: The present study was performed to examine the morphological and compositional changes of human dentin after Er,Cr:YSGG laser irradiation in vitro. Materials and Methods: Twenty dentin specimens were prepared and subjected to Er,Cr:YSGG laser irradiation at 3W (33.9 J/cm2) energy density under continuous water spray (1 ml/min). For morphological studies, 5 samples were observed with SEM and 5 with TEM; diamond-knife-cut surfaces of nonirradiated areas were used as control. The remaining 10 samples were subjected to atomic analysis by SEM-EDX. Statistical analysis was performed between lased and unlased areas (control) using the Mann-Whitney U test; a value of p < 0.01 was considered significant. Results: SEM observation revealed a scaly or irregular surface after Er,Cr:YSGG laser irradiation and an absence of smear layer; the orifices of dentinal tubules were exposed. TEM observation of cross sections of lased dentin showed two different zones: the uppermost surface was the ablated zone, containing irregular microparticles, and underneath this layer was an unaffected zone. On the other hand, the diamond-knife-cut surface of dentin showed no microfragment-like structures, and dentinal tubules were also intact. The results of SEM-EDX revealed no significant differences between the Ca:P ratios of lased and unlased areas. Conclusions: Lased dentin surfaces have an etched appearance, but microfragment-like structures are also present which may hamper adhesion of composite restorative materials.

Keywords: Er,Cr:YSGG laser, human dentin, morphological change, compositional change, TEM, SEM, SEM-EDX

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