scholarly journals COMPARATIVE STUDY OF THE THERMAL EFFECT OF TWO KINDS OF OPTIC FIBRES OF HIGH INTENSIVE 810 NM DIODE LASER (IN VITRO STUDY)

2021 ◽  
Vol 27 (1) ◽  
pp. 3523-3528
Author(s):  
Raya Grozdanova-Uzunova ◽  
◽  
Elka Radeva ◽  
Dimitar Kosturkov ◽  
Evgeniya Popova ◽  
...  
Keyword(s):  
Diode Laser ◽  
Optical Fibers ◽  
Light Guide ◽  
In Vitro Study ◽  
Root Surface ◽  
Quartz Fiber ◽  
Temperature Changes ◽  
Root Canals ◽  
Organically Modified

Purpose: The aim of our in vitro study is to investigate the thermal changes on the outer root surface that occur after irradiation with a high intensive diode laser with two types of optical fibers. Material and Methods: The root canals of 24 extracted single-rooted and multi-rooted teeth (59 root canals) were prepared with Pro Taper Gold to F3 and treated with 810 nm diode laser for 8 s with circular movements from apex to orifices. Teeth are divided into two groups. A quartz light guide is used in the first group, and in the second group, the root canals are treated with an organically modified quartz light guide. The temperature changes were detected with FLIR - Т 330 Infrared Thermal Camera and the data was processed with FLIR Reporter 9 Professional software. Results: In 90% of cases, the temperature rise on the outer root surface is up to 8°C. In the first group with quartz fiber, the minimum increase in temperature is 2°C, the maximum is 11°C (in the cases with four root canals). When using the organically modified quartz fiber, the registered minimum increase in temperature is 1.2°C and maximum increase of 9.2°C (in cases with curved canals). Conclusion: Temperature changes on the outer root surface using an 810 nm diode laser are biocompatible. There is no statistically significant difference between the temperatures measured in the two types of optical fibers used - quartz and organically modified quartz light.

scholarly journals Effect of diode laser irradiation on the apical sealing of MTA retrofillings

2006 ◽  
Vol 20 (3) ◽  
pp. 231-234 ◽  
Author(s):  
Eliana Barbosa de Souza ◽  
Crystiane Venditti Gomes de Amorim ◽  
José Luiz Lage Marques
Keyword(s):  
Laser Irradiation ◽  
Diode Laser ◽  
In Vitro Study ◽  
Apical Surface ◽  
Human Teeth ◽  
Root Canals ◽  
Gutta Percha ◽  
Group 2 ◽  
Student’S T

Apical sealing is essential for the success of paraendodontic surgery, so any procedure that may favor an adequate sealing of the apical remainder should be performed. The purpose of this study was to evaluate the influence of diode laser irradiation on the apical sealing of root-end cavities with MTA retrofillings. Root canals in twenty extracted human teeth were shaped with K-files and filled with gutta-percha. The apexes were cut off and root-end preparations were performed. The roots were divided randomly in 2 groups. Group 1 (ten specimens) was retrofilled with MTA. Group 2 was irradiated with diode laser, with 1 W for 20 seconds, on the apical surface and root end cavity before retrofilling with MTA. The specimens had their external surfaces impermeabilized with cyanoacrylate, except for the apical surface, and were then immersed in 1% rhodamine B dye for 72 h and placed in plaster stone. After that, the specimens were submitted to longitudinal abrasion until half of the root remained. The linear dye leakage was observed in these mid-roots between the root canal wall and retrofilling. The linear dye leakage was measured with Image Lab software, and the results were statistically analyzed with Student's t test. There were no statistically significant differences between the two groups (p > 0.05). The diode laser irradiation did not improve the apical sealing of MTA retrofillings under the conditions of this in vitro study.

scholarly journals Effect of scaling on the invasion of oral microorganisms into dentinal tubules including the response of pulpal cells—an in vitro study

2020 ◽  
Author(s):  
Alexandra Stähli ◽  
Alex S. J. Schatt ◽  
Miro Stoffel ◽  
Sandor Nietzsche ◽  
Anton Sculean ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Root Surface ◽  
Bacterial Invasion ◽  
Human Teeth ◽  
Bacterial Composition ◽  
Dentinal Tubules ◽  
Monocyte Chemoattractant Protein 1 ◽  
Matrix Metalloproteinase 3 ◽  
Root Canals

Abstract Objectives To investigate how scaling affects the penetration of microorganisms into dentinal tubules, how pulpal cells seeded into the pulp cavity respond to bacterial challenge, and how penetration and inflammatory response may depend on the bacterial composition. Materials and methods Root canals of 102 extracted human teeth underwent shaping and cleaning. Half of the teeth were subjected to scaling and root planing, the other half remained untreated. Teeth were exposed to either Streptococcus gordonii and Actinomyces oris or S. gordonii and Porphyromonas gingivalis for 10 weeks. Bacterial invasion was assessed in a depth of 1 mm to the root surface. Human pulpal cells were seeded into the cavities to assess the expression of interleukin-8 (IL-8), monocyte chemoattractant protein-1 (MCP-1), and matrix metalloproteinase-3 (MMP-3) by real-time polymerase chain reaction and immunoassay. Results The percentage of teeth with bacteria detected in dentine was higher when teeth received scaling than when they were untreated: 66.6% versus 44.4% when exposed to A. oris/S. gordonii, and 50% versus 25% when exposed to P. gingivalis/S. gordonii (p = 0.043). Scaling had no impact on IL-8 and MMP-3 expression in pulpal cells. P. gingivalis/S. gordonii caused higher levels of IL-8, MCP-1, and MMP-3 than A. oris/S. gordonii (p = 0.003, p = 0.011, p = 0.037). Conclusion Scaling supports the penetration of bacteria into the dentine of extracted human teeth. P. gingivalis may affect the immune response in pulpal cells. Clinical relevance Root surface debridement with hand instruments may facilitate bacterial penetration. Other kinds of mechanical instrumentation in this experimental setting should be investigated.

scholarly journals Root Surface Temperature Increases during Root Canal Filling In Vitro with Nd:YAG Laser-Softened Gutta-Percha

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Błażej Podolak ◽  
Alicja Nowicka ◽  
Krzysztof Woźniak ◽  
Liliana Szyszka-Sommerfeld ◽  
Włodzimierz Dura ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Root Canal ◽  
In Vitro Study ◽  
Root Surface ◽  
Yttrium Aluminium Garnet ◽  
Root Canal Filling ◽  
Infrared Thermal Imaging ◽  
Temperature Changes ◽  
Gutta Percha

The aim of this in vitro study was to measure the temperature increases produced on the mesial and vestibular root surfaces of premolar teeth during a laser-softened gutta-percha obturation technique. We studied 12 extracted human premolar teeth with a single canal. After root canal cleaning and shaping, the teeth were obturated with gutta-percha that had been softened with a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser (CTL 1503) at a wavelength of 1.064 nm. The laser setup parameters included a 30 Hz frequency and a 200 mJ/pulse with optical fiber tips of 0.320 mm diameter. A sectional warm gutta-percha condensation was used. Temperature changes on the whole mesial and vestibular outer surfaces of the roots were measured at approximately 2 s intervals with an infrared thermal imaging camera. A significantly higher increase in temperature was observed for the mesial root surface (7.5°C) compared to the vestibular surface (3.7°C) (p≈0). The findings suggested that root canal filling with Nd:YAG laser-softened gutta-percha in premolar teeth is not likely to damage the surrounding periradicular tissues. To obtain valid temperature results, the measurement should be performed on the surface with the thinnest root wall.

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