Oral Biol Res.  2021 Jun;45(2):49-58. 10.21851/obr.45.02.202106.49.

Effect of erbium-doped yttrium-aluminum-garnet laser on surface characteristics and biocompatibility of resorbable blast media titanium

Affiliations
  • 1Postgraduate Student, Department of Dental Science Graduate School, Chonnam National University, Gwangju, Republic of Korea
  • 2Postgraduate Student, Department of Dental Science Graduate School, Chonnam National University, Gwangju, Republic of Korea
  • 3Postgraduate Student, Department of Dental Science Graduate School, Chonnam National University, Gwangju, Republic of Korea
  • 4Professor, Department of Periodontology, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea

Abstract

Er:YAG laser irradiation can modify the surface characteristics of titanium surface. This study aimed to evaluate the influence of Er:YAG laser irradiation on mechanical, chemical, and biological characteristics of resorbable blast media (RBM) titanium surfaces. RBM disks were divided into 4 groups. Control groups were nonirradiated RBM disks. Laser irradiated groups were divided into the RBM-50, RBM-100, and RBM-250 group which irradiated Er:YAG laser at energy level 50, 100, and 250 mJ/pulse, respectively. In scanning electron microscopy (SEM) images, whereas the RBM-50 group showed slightly melted surface area, RBM-100 and RBM-250 groups showed broken areas caused by Er:YAG laser. Laser irradiated groups had significantly higher roughness than the control group. The roughness of the RBM-50 group was comparable with the RBM-100 group and significantly lower than the RBM-250 group (p<0.05). In X-ray diffractometer analysis of the laser irradiated group, Ti (002) (rutile) proportion to Ti (101) (anatase) was decreased according to energy level. In X-ray photoelectron spectroscopy analysis, RBM-50 and RBM-100 groups show the crystal change from acidic Ti-OH to basic Ti-OH. MC3T3-E1 cells of all groups adhered and proliferated well on the surfaces and their morphology was not different between groups in SEM images. The alkaline phosphatase activity levels of RBM-50 and RBM-100 groups showed higher than those of the control group (p<0.05). Therefore, within the limitations of this study, Er:YAG laser irradiation at low energy levels can modify mechanical and chemical characteristics of the RBM surface, leading to improve the biological responses of osteoblastic cells on the surface.

Keyword

Biocompatibility; Er:YAG laser; RBM titanium surface; Surface modification
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