XPS analysis of the dentin irradiated by Er:YAG laser

• Published in: Dental Materials Journal Vol. 28; no. 4; pp. 471 - 476
• Main Authors: OMAE, Masanori, SHINNOU, Yasuo, TANAKA, Kumiko, ABO, Tomoko, NAKATA, Takashi, SUZUKI, Koichiro, HATSUOKA, Yoshinori, IWATA, Naohiro, YOSHIKAWA, Kazushi, NISHITANI, Yoshihiro, YAMAMOTO, Kazuyo, YOSHIYAMA, Masahiro
• Format: Journal Article
• Language: English
• Published: Japan The Japanese Society for Dental Materials and Devices 01.07.2009; Japanese Society for Dental Materials and Devices
• Subjects: Calcium - analysis; Calcium - chemistry; Collagen - chemistry; Collagen - radiation effects; Dental Bonding; Dentin; Dentin - chemistry; Dentin - radiation effects; Dentistry; Er:YAG laser; Humans; Lasers, Solid-State - adverse effects; Nitrogen - analysis; Phosphorus - analysis; Photoelectron Spectroscopy; Protein Denaturation; Surface Properties; XPS
• ISSN: 0287-4547; 1881-1361
• DOI: 10.4012/dmj.28.471

The aim of this study was to investigate the effect of Er:YAG laser irradiation on human dentin surface using X-ray photoelectron spectroscopy (XPS). 10 human dentin disks were prepared from extracted human molars for XPS analysis. These specimens were divided into two groups of five: a control group and group that were irradiated by an Er:YAG laser beam (100 mJ, 1Hz). All specimens were analyzed by XPS over a wide scanning range and narrow scanning ranges. The Ca/P ratio was calculated from the XPS results. In the results, the binding energies of Ca, P, and N in the laser-irradiated group were higher than those in the control group. The Ca/P ratio of the Er:YAG laser irradiated group (1.24±0.05) was significantly lower than that of the control group (1.52±0.16). This study showed that Er:YAG laser irradiation decreased Ca/P ratio and denatured the collagen of human dentin.