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Cellular responses on anodized titanium discs after laser irradiation
Author(s) -
Lee JooHee,
Heo SeongJoo,
Koak JaiYoung,
Kim SeongKyun,
Lee ShinJae,
Lee SeokHyung
Publication year - 2008
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.20721
Subject(s) - irradiation , titanium , laser , osteoblast , alkaline phosphatase , anodizing , nuclear chemistry , materials science , chromium , scandium , chemistry , radiochemistry , in vitro , metallurgy , aluminium , biochemistry , optics , enzyme , physics , nuclear physics
Background and Objectives Although the laser is one of the widely used systems in dental field, literature about the biological effects of laser irradiation on the titanium surface is rare. The aim of this study was to investigate the responses of osteoblast‐like cells seeded onto laser irradiated anodized titanium discs, using a CO 2 (carbon dioxide) and Er,Cr:YSGG (erbium chromium‐doped yttrium scandium gallium garnet) laser, with reference to cellular proliferation and differentiation in vitro. Study Design/Materials and Methods Osteoblast‐like HOS cells were cultured on four differently treated anodized titanium disc surfaces. Group 1, anodized (control); group 2, CO 2 laser irradiated; group 3, Er,Cr:YSGG laser irradiated (150 J/cm 2 ); group 4, Er,Cr:YSGG laser irradiated (300 J/cm 2 ). MTS‐based cell proliferation assay and alkaline phosphatase (ALP) activity test were used to compare cellular responses after 1 and 3 days. Three‐way analysis of variance (ANOVA) and post hoc method were carried out to determine the statistical significance of the differences. Results The cells proliferated actively on all substrates; greatest cellular proliferation was observed in group 4, followed by groups 2, 3, and 1, respectively ( P <0.05). The test groups also presented significantly higher ALP activities than the control group ( P <0.05) except group 3. For both tests, measured optical densities at 3 days were greater than that of 1 day in control and all test groups ( P <0.001). Conclusion The data shows that irradiation with a CO 2 laser or Er,Cr:YSGG laser may induce a measurable positive effect on osteoblast proliferation and differentiation. Lasers Surg. Med. 40:738–742, 2008. © 2008 Wiley‐Liss, Inc.