scholarly journals Low intensity laser irradiation in myogenic precursor cells: an in vitro study (732.4)

2014 ◽  
Vol 28 (S1) ◽  
Author(s):  
André Amaral ◽  
Heloisa Araújo ◽  
Nivaldo Parizotto ◽  
Tânia Salvini
Keyword(s):  
Laser Irradiation ◽  
In Vitro Study ◽  
Precursor Cells ◽  
Vitro Study ◽  
Low Intensity ◽  
Intensity Laser ◽  
Myogenic Precursor

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

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

scholarly journals The Combined Occluding Effects of Fluoride-Containing Dentin Desensitizer and Nd-yag Laser Irradiation on Human Dentinal Tubules: an In Vitro Study

2006 ◽  
Vol 22 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Po-Jen Hsu ◽  
Jeng-Huey Chen ◽  
Fu-Hsiung Chuang ◽  
Rong-Tai Roan
Keyword(s):  
Laser Irradiation ◽  
In Vitro Study ◽  
Vitro Study ◽  
Dentinal Tubules ◽  
Yag Laser

Microleakage of Class V Composite Restorations Following Er:YAG and Nd:YAP Laser Irradiation Compared to Acid-etch: an In Vitro Study

2002 ◽  
Vol 17 (2) ◽  
pp. 93-100 ◽  
Author(s):  
V. Armengol ◽  
A. Jean ◽  
B. Enkel ◽  
M. Assoumou ◽  
H. Hamel
Keyword(s):  
Laser Irradiation ◽  
In Vitro Study ◽  
Vitro Study ◽  
Class V ◽  
Composite Restorations ◽  
Acid Etch

Surface topography of enamel and dentine from primary teeth following infrared Nd-YAG laser irradiation: An in vitro study

1997 ◽  
Vol 12 (1) ◽  
pp. 61-67 ◽  
Author(s):  
L. A. Jalil ◽  
R. Labella ◽  
G. J. Pearson
Keyword(s):  
Surface Topography ◽  
Laser Irradiation ◽  
Primary Teeth ◽  
In Vitro Study ◽  
Vitro Study ◽  
Yag Laser

Combined Tin-Containing Fluoride Solution and CO2 Laser Treatment Reduces Enamel Erosion in vitro

2015 ◽  
Vol 49 (6) ◽  
pp. 565-574 ◽  
Author(s):  
Marcella Esteves-Oliveira ◽  
Nadine Witulski ◽  
Ralf-Dieter Hilgers ◽  
Christian Apel ◽  
Hendrik Meyer-Lueckel ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
In Vitro Study ◽  
Vitro Study ◽  
Enamel Surface ◽  
Fluoride Solution ◽  
Surface Loss ◽  
Linear Contrasts

The aim of this in vitro study was to evaluate the effect of combined CO2 laser and tin-containing fluoride treatment on the formation and progression of enamel erosive lesions. Ninety-six human enamel samples were obtained, stored in thymol solution and, after surface polishing, randomly divided into 6 different surface treatment groups (n = 16 in each group) as follows: no treatment, control (C); one CO2 laser irradiation (L1); two CO2 laser irradiations (L2); daily application of fluoride solution (F); combined daily fluoride solution + one CO2 laser irradiation (L1F), and combined daily fluoride solution + two CO2 laser irradiations (L2F). Laser irradiation was performed at 0.3 J/cm2 (5 µs/226 Hz/10.6 µm) on day 1 (L1) and day 6 (L2). The fluoride solution contained AmF/NaF (500 ppm F), and SnCl2 (800 ppm Sn) at pH 4.5. After surface treatment the samples were submitted to an erosive cycling over 10 days, including immersion in citric acid (2 min/0.05 M/pH = 2.3) 6 times daily and storage in remineralization solution (≥1 h) between erosive attacks. At the end of each cycling day, the enamel surface loss (micrometers) was measured using a 3D laser profilometer. Data were statistically analyzed by means of a 2-level mixed effects model and linear contrasts (α = 0.05). Group F (-3.3 ± 2.0 µm) showed significantly lower enamel surface loss than groups C (-27.22 ± 4.1 µm), L1 (-18.3 ± 4.4 µm) and L2 (-16.3 ± 5.3 µm) but higher than L1F (-1.0 ± 4.4 µm) and L2F (1.4 ± 3.2 µm, p < 0.05). Under the conditions of this in vitro study, the tin-containing fluoride solution caused 88% reduction of enamel surface loss, while its combination with CO2 laser irradiation at 0.3 J/cm2 hampered erosive loss almost completely.

The effect of low - level laser irradiation on malignant blood cells: an in vitro study

2012 ◽  
pp. S253-.
Author(s):  
H Hosseinkazemi ◽  
S Dastanpour ◽  
J Bitolahi ◽  
K. Saber
Keyword(s):  
Laser Irradiation ◽  
Blood Cells ◽  
In Vitro Study ◽  
Vitro Study ◽  
Low Level ◽  
Low Level Laser ◽  
Level Laser ◽  
Low Level Laser Irradiation
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