Bactericidal effects of 2.94 μm Er:YAG-laser radiation in dental root canals

Mehl, Albert; Folwaczny, Matthias; Haffner, Cornelius; Hickel, Reinhard

doi:10.1016/s0099-2399(99)80288-x

Cited by 101 publications

(83 citation statements)

References 16 publications

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“…On the other hand, the wavelength of Er:YAG laser is 2.94 µm with a high absorption rate in water, thus causing a smaller thermal effect on the surrounding apical tissues than other lasers 11,12) . For these favorable reasons, Er:YAG laser has been clinically used for various types of endodontic treatments [6][7][8][9][10] . In the field of operative dentistry, studies have shown that Er:YAG laser was able to melt and remove restorative filling materials 22,23) .…”

Section: Discussionmentioning

confidence: 99%

“…By means of a flexible fiber delivery system and a smalldiameter laser tip for insertion into a root canal, numerous trials and evaluations have been conducted to determine if Er:YAG laser is safe and reliable for clinical dental applications. These included removal of smear layer and debris by irradiation in a root canal 6) , root canal disinfection 7,8) , root canal enlargement 9) , and root resection 10) , in addition to basic scientific research which focused on temperature changes at the root surface due to use of Er:YAG laser irradiation 11,12) and the latter's thermal effects on periradicular periodontal tissues 13) . The purpose of this study was to evaluate the ability of Er:YAG laser in removing root canal filling materials during retreatment.…”

Section: Introductionmentioning

confidence: 99%

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Removal of root canal filling materials using Er:YAG laser irradiation

Tachinami

Katsuumi

2010

Dent. Mater. J.

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The purpose of this study was to examine the ability of Er:YAG laser to remove root canal filling materials. The root canals of 21 extracted human anterior teeth were enlarged, and then obturated with gutta-percha points and sealer by lateral condensation. Filling materials were removed from root canals using Er:YAG laser irradiation at three energy output levels (30, 40, and 50 mJ/ pulse), and the corresponding time required for material removal at each energy output level was recorded. The amount of remaining filling material and the degree of dentin ablation in the canal wall were assessed using microfocus X-ray CT before and after removal. At 30 mJ, the time required for root canal filling material removal was significantly longer than at energy outputs of 40 and 50 mJ (p<0.01). On filling material remnants and the degree of dentin ablation, these parameters were not significantly different among the three energy outputs. In conclusion, these results suggested that Er:YAG laser irradiation is capable of removing root canal filling materials.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of root canal filling materials using Er:YAG laser irradiation

Tachinami

Katsuumi

2010

Dent. Mater. J.

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“…[12][13][14][15] These lasers disinfect the canals from resistant bacteria such as E. faecalis. [16][17][18][19][20][21][22][23] One of these lasers which are introduced for endodontic treatment is Er:YAG laser. 14,15 The bactericidal effect of this laser has been showed in some studies.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 The bactericidal effect of this laser has been showed in some studies. 17,18 In addition to bactericidal effect, this laser has the minimal thermal damage. 23,24 In the study by Perin et al on permanent teeth, the effectiveness of Er:YAG laser on E. faecalis was verified.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Er:YAG Laser on Entroccocus faecalis Bacterium in the Pulpectomy of Anterior Primary Teeth

et al. 2017

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Introduction: Successful root canal therapy depends on the complete elimination of microorganisms such as Entroccocus faecalis, which is impossible to achieve with the traditional methods. Lasers are recently introduced as a new method to solve the problem. The present study is planned and performed to examining the antibacterial effect of Er: YAG laser. Methods: Sixty extracted anterior primary teeth were prepared and sterilized. E. faecalis bacterium was cultured in canals. Samples were randomly divided into two groups. The first group was disinfected by NaOCl 5/25% and Er: YAG laser and the second group just by NaOCl 5/25%. Samples of canal contents were cultured and colony counts were calculated. The results were analyzed statistically by SPSS software and Mann Whitney test. Results: There was no significant difference between colony counts in both groups (P = 0.142). But the number of colonies in the first group was lower than in the second group. Conclusion: Although, Er: YAG laser cannot completely eliminate E. faecalis bacterium, its simultaneous use with NaOCl decreases E. faecalis.

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“…Lasers have been used clinically in dental practice for various purposes, including tooth cutting, washing in root canals, scaling, and pain relief in soft tissues 14,15) ; and many studies have reported the bactericidal effects of lasers. 2,[4][5][6][8][9][10]13,18) However, lasers have different properties depending on wavelength; for example, the Nd:YAG laser has high tissue permeability and is able to affect deep tissue, whereas the Er:YAG laser has good absorption properties in water and acts on the surface of tissues.…”

Section: Introductionmentioning

confidence: 99%

Bactericidal Effects of 2.94μm and 1.67μm Laser

Kukidome

Amagai

Osuka

et al. 2010

Bull. Tokyo Dent. Coll.

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The bactericidal effects of lasers with wavelengths of 1.67 and 2.94m on cariogenic Streptococcus mutans were investigated. Temperature during irradiation was also measured to determine the mechanism underlying the bactericidal effects of the lasers. An aliquot of 2l cell suspension of S. mutans JC-2 strain was placed on anhydrous quartz or dentin plate, covering an area of approximately 5.0 mm in diameter to a depth of approximately 0.1 mm. Cell suspension was then irradiated at a power of 0.8 W (3.1 J/cm 2 ) at a rate of 40 pps for 30 sec. After irradiation, the plate was put into a bottle containing PBS and vigorously voltated. Solution was serially diluted and inoculated on MS agar. After incubation anaerobically for 72 hr, colony forming units on the agar were counted. The experimental group, the number of bacteria decreased significantly compared to the control group under all conditions. No significant differences were observed in effect of wavelength or plate on bactericidal activity. In conclusion, laser irradiation at a wavelength of 1.67m for 30 sec showed a bactericidal effect on S. mutans, suggesting that this wavelength is more useful than 2.94m due to greater tissue penetration.

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Bactericidal effects of 2.94 μm Er:YAG-laser radiation in dental root canals

Cited by 101 publications

References 16 publications

Removal of root canal filling materials using Er:YAG laser irradiation

Removal of root canal filling materials using Er:YAG laser irradiation

The Effect of Er:YAG Laser on Entroccocus faecalis Bacterium in the Pulpectomy of Anterior Primary Teeth

Bactericidal Effects of 2.94μm and 1.67μm Laser

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