scholarly journals Low-power laser irradiation inhibits arecoline-induced fibrosis: an in vitro study

2017 ◽  
Vol 9 (1) ◽  
pp. 38-42 ◽  
Author(s):  
Mei-Chun Yeh ◽  
Ker-Kong Chen ◽  
Min-Hsuan Chiang ◽  
Chia-Hsin Chen ◽  
Ping-Ho Chen ◽  
...  
Keyword(s):  
Low Power ◽  
Laser Irradiation ◽  
In Vitro Study ◽  
Vitro Study ◽  
Power Laser

scholarly journals Er:YAG laser-induced damage to a dental composite in simulated clinical scenarios for inadvertent irradiation: an in vitro study

2021 ◽  
Author(s):  
Katharina Kuhn ◽  
Carmen U. Schmid ◽  
Ralph G. Luthardt ◽  
Heike Rudolph ◽  
Rolf Diebolder
Keyword(s):  
Laser Irradiation ◽  
Laser Fluence ◽  
Ablation Threshold ◽  
Er:Yag Laser ◽  
In Vitro Study ◽  
Vitro Study ◽  
Crater Diameter ◽  
Clinical Scenarios ◽  
Laser Induced Damage

AbstractInadvertent Er:YAG laser irradiation occurs in dentistry and may harm restorative materials in teeth. The aim of this in vitro study was to quantify Er:YAG laser-induced damage to a nanohybrid composite in simulated clinical scenarios for inadvertent direct and indirect (reflection) laser irradiation. The simulation was performed by varying the output energy (OE;direct˃indirect) reaching the specimen and the operating distance (OD;direct˂indirect). Composite specimens were irradiated by an Er:YAG laser. The ablation threshold was determined and clinically relevant parameters were applied (n = 6 for each OE/OD combination) for direct (OE: 570 mJ/OD: 10 mm, OE: 190 mJ/OD: 10 mm) and indirect irradiation (OE: 466 mJ/OD: 15 mm, OE: 57 mJ/OD: 15 mm, OE: 155 mJ/OD: 15 mm, OE: 19 mJ/OD: 15 mm). The extent of damage in the form of craters was evaluated using a laser scanning microscope (LSM) and a conventional light microscope (LM). The ablation threshold was determined to be 2.6 J/cm2. The crater diameter showed the highest value (LM: 1075 ± 18 µm/LSM: 1082 ± 17 µm) for indirect irradiation (reflectant:dental mirror) (OE: 466 mJ/OD: 15 mm). The crater depth showed the highest and comparable value for direct (OE: 570 mJ/OD: 10 mm; LSM: 89 ± 2 µm) and indirect irradiation (OE: 466 mJ/OD: 15 mm; LSM: 90 ± 4 µm). For each OD, the crater diameter, depth, and volume increased with higher laser fluence. However, the OD—and thus the laser spot diameter—also had an enlarging effect. Thus, indirect irradiation (reflectant:dental mirror) with only 47% of the laser fluence of direct irradiation led to a larger diameter and a comparable depth. The three-dimensional extent of the crater was large enough to cause roughening, which may lead to plaque accumulation and encourage caries, gingivitis, and periodontitis under clinical conditions. Clinicians should be aware that reflected irradiation can still create such craters.

Thermodynamic effects of laser irradiation of implants placed in bone: an in vitro study

2012 ◽  
Vol 28 (6) ◽  
pp. 1435-1440 ◽  
Author(s):  
Chris Leja ◽  
Alessandro Geminiani ◽  
Jack Caton ◽  
Georgios E. Romanos
Keyword(s):  
Laser Irradiation ◽  
In Vitro Study ◽  
Vitro Study ◽  
Thermodynamic Effects

In vitro anti-tumor effect of low-power laser irradiation (LPLI) on gastroenterological carcinoma cells

2019 ◽  
Vol 35 (3) ◽  
pp. 677-685 ◽  
Author(s):  
Ye Tian ◽  
Yeachan Lee ◽  
Hyejin Kim ◽  
Hyun Wook Kang
Keyword(s):  
Low Power ◽  
Laser Irradiation ◽  
Carcinoma Cells ◽  
Power Laser

Effect of Er:YAG laser irradiation on deciduous enamel roughness and bacterial adhesion: An in vitro study

2019 ◽  
Author(s):  
Bernardo Teutle‐Coyotecatl ◽  
Rosalía Contreras‐Bulnes ◽  
Rogelio José Scougall‐Vilchis ◽  
Argelia Almaguer‐Flores ◽  
Laura Emma Rodríguez‐Vilchis ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Bacterial Adhesion ◽  
Er:Yag Laser ◽  
In Vitro Study ◽  
Vitro Study ◽  
Enamel Roughness

Low power laser irradiation alters gene expression of olfactory ensheathing cells in vitro

2005 ◽  
Vol 37 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Kimberly R. Byrnes ◽  
Xingjia Wu ◽  
Ronald W. Waynant ◽  
Ilko K. Ilev ◽  
Juanita J. Anders
Keyword(s):  
Gene Expression ◽  
Low Power ◽  
Laser Irradiation ◽  
Olfactory Ensheathing Cells ◽  
Power Laser ◽  
Ensheathing Cells
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