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

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 Comparative evaluation of microleakage of nano-filled resin-modified glass ionomer: An in vitro study

2014 ◽  
Vol 08 (04) ◽  
pp. 450-455 ◽  
Author(s):  
Nesrin Eronat ◽  
Emir Yilmaz ◽  
Nazan Kara ◽  
Asli Topaloglu Ak
Keyword(s):  
Third Molar ◽  
In Vitro Study ◽  
High Viscosity ◽  
Vitro Study ◽  
Glass Ionomer ◽  
Class V ◽  
Dye Penetration ◽  
Resin Modified Glass Ionomer ◽  
Group B

ABSTRACT Objective: This in vitro study evaluated the microleakage of a nano-filled resin-modified glass ionomer and a high viscosity glass-ionomer restorations in class V cavities. Materials and Methods: Thirty-two class V cavities prepared on the buccal and lingual surfaces of 16 sound, third molar teeth were randomly assigned into two groups and restored by one of the glass ionomer material; Group A: A high viscosity (Ketac Molar, 3M ESPE) Group B: A nano-filled resin-modified (Ketac N100, 3M ESPE) glass ionomer. One clinician prepared all the cavities. The materials were used according to the manufacturers’ recommendations. The restored teeth were then stored in distilled water at 37°C for 24 h, thermocycled at 5-55°C for 1000 cycles. The specimens were immersed in aqueous solution of Indian ink dye for 48 h at room temperature. They were embedded in resin polyester and sectioned longitudinally in a buccolingual direction. Microleakage was assessed according to the depth of dye penetration along the restoration. The extent of dye penetration at the occlusal and gingival margins was assessed using a stereo microscope. Randomly selected samples from each group were prepared for scanning electron microscope evaluation. The data were statistically analyzed with Friedman and Wilcoxon signed ranks tests. Results: There were statistically significant differences between the microleakage scores of the two groups for both occlusal and gingival scores (P = 0.001). Occlusal and gingival scores for high viscosity glass ionomer (P = 0.024) and nanoionomer (P = 0.021) using Wilcoxon signed ranks tests showed statistically significant differences. High viscosity glass ionomer showed significantly less microleakage compared to the nano-filled resin-modified glass-ionomer (RMGIs) at occlusal margin (P = 0.001). No significant differences were found between the groups at gingival margin (P = 0.0317). Conclusion: Within the limitations of this in vitro study, nano-filled RMGIs restorations did not perform better than high viscosity glass ionomer in class V cavities in terms of microleakage assessment.

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