Preliminary investigation of the histological effects of laser endodontic treatment on the periradicular tissues in dogs

Bahcall, James K.; Howard, Paul E.; Miserendino, Leo J.; Walia, Harmeet

doi:10.1016/s0099-2399(06)81369-5

Cited by 79 publications

(40 citation statements)

References 16 publications

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“…On the other hand, thermographic studies have also been conducted using infrared cameras -with results similar to those afforded by thermocouples (10). Bahcall et al (11) were the first to study the effects of laser irradiation upon the periodontal tissues, in dogs. Their results indicated that the irradiated teeth suffer ankylosis, since lysis of the root cement was observed.…”

Section: Discussionmentioning

confidence: 99%

In vitro evaluation of the temperature increment at the external root surface after Er,Cr:YSGG laser irradiation of the root canal

Abad-Gallegos¹,

Arnabat-Domínguez²,

España-Tost³

et al. 2009

Med Oral

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Objectives. A study was made to determine the temperature increment at the dental root surface following Er,Cr:YSGG laser irradiation of the root canal. Design. Human canines and incisors previously instrumented to K file number ISO 30 were used. Irradiation was carried out with glass fiber endodontic tips measuring 200 µm in diameter and especially designed for insertion in the root canal. The teeth were irradiated at 1 and 2 W for 30 seconds, without water spraying or air, and applying a continuous circular movement (approximately 2 mm/sec.) in the apico-coronal direction. Results. At the 1 W power setting, the mean temperature increment was 3.84ºC versus 5.01ºC at 2 W. In all cases the difference in mean value obtained after irradiation versus the mean baseline temperature proved statistically significant (p< 0.05). Conclusions. Application of the Er,Cr:YSGG laser gives rise to a statistically significant temperature increment at the external root surface, though this increment is probably clinically irrelevant, since it would appear to damage the tissues (periodontal ligament and alveolar bone) in proximity to the treated tooth.

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Section: Discussionmentioning

confidence: 99%

In vitro evaluation of the temperature increment at the external root surface after Er,Cr:YSGG laser irradiation of the root canal

Abad-Gallegos¹,

Arnabat-Domínguez²,

España-Tost³

et al. 2009

Med Oral

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“…In recent years novel antimicrobial approaches to disinfecting root canals have been proposed that include the use of high-power lasers [13] as well as photodynamic therapy (PDT) [14,15]. High power lasers function by dose-dependent heat generation but, in addition to killing bacteria, they have the potential to cause collateral damage such as char dentine, ankylose roots, melt cementum, cause root resorption, and periradicular necrosis [16]. The chief difficulty faced in eliminating bacteria growth in root canals is the fact that they grow as biofilms [17].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial photodynamic therapy combined with conventional endodontic treatment to eliminate root canal biofilm infection

et al. 2006

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Background and Objective: To compare the effectiveness of antimicrobial photodynamic therapy (PDT), standard endodontic treatment and the combined treatment to eliminate bacterial biofilms present in infected root canals. Study Design/Materials and Methods: Ten singlerooted freshly extracted human teeth were inoculated with stable bioluminescent Gram-negative bacteria, Proteus mirabilis and Pseudomonas aeruginosa to form 3-day biofilms in prepared root canals. Bioluminescence imaging was used to serially quantify bacterial burdens. PDT employed a conjugate between polyethylenimine and chlorin(e6) as the photosensitizer (PS) and 660-nm diode laser light delivered into the root canal via a 200-m fiber, and this was compared and combined with standard endodontic treatment using mechanical debridement and antiseptic irrigation. Results: Endodontic therapy alone reduced bacterial bioluminescence by 90% while PDT alone reduced bioluminescence by 95%. The combination reduced bioluminescence by > 98%, and importantly the bacterial regrowth observed 24 hours after treatment was much less for the combination (P < 0.0005) than for either single treatment. Conclusions: Bioluminescence imaging is an efficient way to monitor endodontic therapy. Antimicrobial PDT may have a role to play in optimized endodontic therapy. Lasers Surg.

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“…High-power lasers function by dose-dependent heat generation, but, in addition to killing bacteria, they have the potential to cause collateral damage such as char dentine, ankylosis roots, cementum melting, and root reabsorption and periradicular necrosis if incorrect laser parameters are used (13).…”

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confidence: 99%

Antimicrobial Effects of Photodynamic Therapy on Patients with Necrotic Pulps and Periapical Lesion

Garcez

Núñez

Hamblin

et al. 2008

Journal of Endodontics

228

187

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This study analyzed the antimicrobial effect of photodynamic therapy (PDT) in association with endodontic treatment. Twenty patients were selected. Microbiological samples were taken after accessing the canal, endodontic therapy, and PDT. At the end of the first session, the root canal was filled with Ca(OH) 2 , and after 1 week, a second session of the therapies was performed. Endodontic therapy gave a mean reduction of 1.08 log. The combination with PDT significantly enhanced the reduction (1.83 log, p = 0.00002). The second endodontic session gave a similar diminution to the first (1.14 log), and the second PDT was significantly more effective than the first (p = 0.002). The second total reduction was significantly higher than the second endodontic therapy (p = 0.0000005). The total first + second reduction (3.19 log) was significantly different from the first combination (p = 0.00006). Results suggest that the use of PDT added to endodontic treatment leads to an enhanced decrease of bacterial load and may be an appropriate approach for the treatment of oral infections. KeywordsEndodontics; polyethylenimine and chlorin(e6) conjugate; red laser; root canal Elimination of the pathogenic microflora from the root canal system during endodontic therapy is one of the main goals of endodontic treatment. Microbial infection plays an important role in the development of necrosis in the dental pulp and the formation of periapical lesions (1). It is well established that the eradication of bacteria from root canals is difficult, and current endodontic techniques are unable to consistently disinfect the canal systems (2). Accepted treatment procedures to eliminate the infection include root canal debridement and mechanical shaping or smoothing (3), irrigation with disinfectant agents such as sodium hypochlorite or hydrogen peroxide, the application of an interappointment dressing containing an antimicrobial agent, and sealing of the root canal (4). In case of infection, the use of antibiotics and antiseptics is an alternative approach, but the long-term use of chemical antimicrobial agents, however, can be rendered ineffective by resistance developing in the target organisms (5-7).Studies have shown that in cases when a negative microbiological culture has been obtained from the root canal at the time of obturation, there is a 94% success rate. On the other hand, when obturation is performed in a positive culture, the success rate is reduced to 68%. Previous studies have shown that the shoddier healing of periapical lesions is more likely in obturated root canals with positive cultures by the end of the endodontic treatment (8,9).Novel approaches to disinfecting root canals have been proposed recently that include the use of high-power lasers (10) as well as photodynamic therapy (PDT) (11,12). High-power lasers function by dose-dependent heat generation, but, in addition to killing bacteria, they have the potential to cause collateral damage such as char dentine, ankylosis roots, cementum melting, and root reabso...

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Preliminary investigation of the histological effects of laser endodontic treatment on the periradicular tissues in dogs

Cited by 79 publications

References 16 publications

In vitro evaluation of the temperature increment at the external root surface after Er,Cr:YSGG laser irradiation of the root canal

In vitro evaluation of the temperature increment at the external root surface after Er,Cr:YSGG laser irradiation of the root canal

Antimicrobial photodynamic therapy combined with conventional endodontic treatment to eliminate root canal biofilm infection

Antimicrobial Effects of Photodynamic Therapy on Patients with Necrotic Pulps and Periapical Lesion

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