Antimicrobial effect of irrigant combinations within dentinal tubules

Heling,; Chandler,

doi:10.1046/j.1365-2591.1998.00124.x

Cited by 52 publications

(66 citation statements)

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“…17 A further criterion for this choice was that it also played a part in numerous other studies, so there is a comparability. 3,[6][7][8][9]12,13,15,16,21,22 According to Moritz et al, this bacterium only begins to show strong morphologic cell damage at an output of 1.5 W and 15 Hz when irradiated with an Nd:YAG laser through a 1-mm-thick layer of dentin. 15 Figure 9 shows the laser treatment of the dentin slices.…”

Section: Methodsmentioning

confidence: 99%

Bactericidal Effect of a 980-nm Diode Laser in the Root Canal Wall Dentin of Bovine Teeth

Gutknecht¹,

Franzen²,

Schippers³

et al. 2004

Journal of Clinical Laser Medicine & Surgery

185

120

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Objective: The aim of this in vitro study was to investigate the antibacterial depth effect of continuous wave laser irradiation with a wavelength of 980 nm in the root canal wall dentin of bovine teeth. Background Data: The long-term success of an endodontic therapy often fails due to remaining bacteria in the root canal or dentin tubules, which cannot be sufficiently eliminated through the classical root canal preparation technique nor through rinsing solutions. Materials and Methods: A total of 102 slices of bovine root dentin of different thicknesses (100, 300 and 500 µm) were prepared. The samples were inoculated from one side with 5 µL of an enterococcus faecalis suspension of defined concentration. Four slices per slice thickness served as a control group; the rest of the 30 slices per thickness were subjected to laser irradiation-10 each of these slices were irradiated with distal outputs of 1.75, 2.3, and 2.8 Watts (W). After drying them for 30 sec, the back of the inoculated dentin slice was irradiated for 32 seconds with a 200-µm fiber optical waveguide under constant movement of the fibers. The remaining bacteria were then detached in NaCl under vibration. The eluate produced by this was-taking account of the degree of dilution-plated out on sheep blood agar plates. After 24 h of incubation, the grown bacterial colonies were able to be counted out and evaluated. By doing so, they were compared with the non-irradiated, but otherwise identically treated control group. Results: With a slice thickness of 100 µm, the 980-nm diode laser achieved a maximum bacterial reduction of 95% at 1.75 W, 96% at 2.3 W, and 97% at 2.8 W. With a slice thickness of 300 µm, a maximum of 77% of the bacteria was destroyed at 1.75 W, 87% at 2.3 W, and 89% at 2.8 W. The maximum bacterial reduction with a slice thickness of 500 µm was 57% at 1.75 W, 66% at 2.3 W, and 86% at 2.8 W. Conclusion: The results of this research show that the 980-nm diode laser can eliminate bacteria that have immigrated deep into the dentin, thus being able to increase the success rate in endodontic therapy. 9

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Section: Methodsmentioning

confidence: 99%

Bactericidal Effect of a 980-nm Diode Laser in the Root Canal Wall Dentin of Bovine Teeth

Gutknecht¹,

Franzen²,

Schippers³

et al. 2004

Journal of Clinical Laser Medicine & Surgery

185

120

View full text Add to dashboard Cite

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“…14,15 In vitro studies have also been inconsistent in their findings, with NaOCl more effective, [16][17][18] chlorhexidine more effective, 8 or no significant difference between the two. [19][20][21][22][23][24] In vitro effects of NaOCl-particularly in high concentrations-on single-species or multispecies bacterial biofilms have been shown to be superior to chlorhexidine. 17,[25][26][27] However, a study revealed that chlorhexidine was more effective than NaOCl against fungi in both pure and mixed cultures as well as in biofilms.…”

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confidence: 99%

Bacteriologic investigation of the effects of sodium hypochlorite and chlorhexidine during the endodontic treatment of teeth with apical periodontitis

Siqueira

Rôças

Paiva

et al. 2007

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, an

147

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Objective. This clinical study was undertaken to compare the effectiveness of 2.5% sodium hypochlorite (NaOCl) and 0.12% chlorhexidine digluconate as irrigants in reducing the cultivable bacterial populations in infected root canals of teeth with apical periodontitis. Study design. According to stringent inclusion/exclusion criteria, 32 teeth with primary intraradicular infections and chronic apical periodontitis were selected and followed in the study. Bacterial samples were taken at the baseline (S1) and after chemomechanical preparation using either NaOCl (n ϭ 16) or chlorhexidine (n ϭ 16) as irrigants (S2). Cultivable bacteria recovered from infected root canals at the 2 stages were counted. Isolates from S2 samples were identified by means of 16S rRNA gene sequencing analysis.

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“…Successful cleaning entails the use of instruments to mechanically remove dentin, irrigant to flush loosened debris away, and chemicals to dissolve contaminants from inaccessible regions 2) . Sodium hypochlorite and hydrogen peroxide are common endodontic irrigants that are used for the debridement and deproteinization of mechanically prepared, smear-layer-covered radicular dentin 3) . Sodium hypochlorite is also frequently used for chemomechanical caries removal and the arrest of hemorrhage in pulpal exposures before bonding to coronal dentin occurs [4][5] .…”

Section: 국문초록mentioning

confidence: 99%