Effect of Laser (670 nm) on Healing of Wounds Covered with Occlusive Dressing: A Histologic and Biomechanical Analysis

Guirro, Elaine Caldeira de Oliveira; Montebelo, Maria Imaculada de Lima; Bortot, Bianca de Almeida; Torres, Marina Aparecida da Costa Betito; Polacow, Maria L. O.

doi:10.1089/pho.2008.2387

Cited by 20 publications

(6 citation statements)

References 22 publications

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“…23 It is described as ranging from 4 to 10 J/cm 2 for soft tissues. [35][36][37][38][39] In light of this information, the laser doses selected were 10 and 20 J/cm 2 in this investigation. Although some researchers reported that there is no relationship between the cortical bone thickness and the stability of the mini screw, [40][41][42] others reported an opposing argument.…”

Section: Discussionmentioning

confidence: 99%

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Göymen

İşman

Taner

et al. 2015

Photomedicine and Laser Surgery

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Objective: The purpose of this study was to evaluate the effects of different laser dose and force levels on the stability of orthodontic mini screws used for anchorage, by histomorphometric analyses. Background data: Low-level laser therapy speeds up blood flow, improves the mechanism of the revitalization processes, reduces the risk of infection, boosts metabolic activities, and accelerates the healing of the damaged tissue. Although there are many research studies about low-level laser therapy applications in a variety of areas, no investigations were found concerning mini screw stability using various laser dose levels with different force level applications. Methods: Seventeen New Zealand white rabbits were used. A total of 68 cylindrical, self-drilling orthodontic mini screws were threaded at the fibula. Experimental subjects were divided into six groups; force application was not performed in the first three groups, whereas 150g of force was applied via nickel-titanium closed-coil springs placed between two mini screws in the other three groups. Measurements of the initial torque values (10 Ncm) were manipulated by a digital portable torque gauge. Various low-level laser doses were applied to the groups during the postoperative 10 days. After 4 weeks, bone-to-implant contact and cortical bone thickness were histomorphometrically analyzed. Results: In the 150g force plus 20 J/cm 2 dosage group, the highest bone-to-implant contact values were observed. ( p < 0.05) There were no statistically significant correlations between cortical bone thickness and bone-to-implant contact values; on the other hand, no significant difference was found among the same groups in terms of cortical bone thickness values ( p > 0.05). Conclusions: Low-level laser therapy was noticed to induce the mini screw-bone contact area. Low-level laser therapy may be a supplementary treatment method to increase the stability of the orthodontic mini screw.

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Section: Discussionmentioning

confidence: 99%

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Göymen

İşman

Taner

et al. 2015

Photomedicine and Laser Surgery

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“…[15][16][17] The safety of high-intensity lasers in the clinical and healthcare elds has attracted much attention. Among the three main interactions between the laser beam and biological tissues, namely photo-thermal, photo-mechanical (or photo-acoustical), and photo-chemical interactions, [18][19][20] the photo-thermal interaction is crucial considering the issue of safety. [21][22][23] For decades, researchers made great efforts to explore various techniques for monitoring the temperature of body tissues at deep levels during laser-induced thermotherapy, and two major technologies have been developed.…”

Section: Introductionmentioning

confidence: 99%

Penetrating effect of high-intensity infrared laser pulses through body tissue

Han

Wang

et al. 2018

RSC Adv.

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“…In immunodepressed animals, the low intensity laser with wavelength of 810 nm was also effective for a greater percentage of contraction of the lesion area [33]. Oliveira Guirro et al [34] evaluated the effects of laser irradiation of 670 nm, with energy densities of 4 and 7 J/cm 2 in the tissue repair process of induced surgical wounds in rats and found positive results in both doses on the seventh day after injury and the animals evaluated on the 14-2021876824 th day presented complete closure of the epithelium. Gupta et al [24] also studied the pulsed 904 nm, evidencing its positive effects for the treatment of wounds in burn-induced rats on the eighth day after injury.…”

Section: Discussionmentioning

confidence: 97%

The photobiomodulation (658, 830 and 904nm) on wound healing in histomorphometric analysis

et al. 2020

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A fotobiomodulação (658, 830 e 904nm) na cicatrização de feridas na análise histomorfométrica La fotobiomodulación (658, 830 y 904nm) en la cicatrización de heridas en el análisis histomorfométrico Abstract Introduction: Photobiomodulation (PBM) assists in the processes of angiogenesis and cellular mitosis after skin lesion, contributing to tissue repair. Objective: to investigate the effects of photobiomodulation (during the proliferative phase) of 658 nm, 830 nm and 904 nm in the repair of skin lesions in an animal model. Method: 658 nm (G658), 830 nm (G830), 904 nm (G904) PBM, and control group (CG) integrated the research. We submitted the animals to an excisional wound and treatment at different wavelengths for 14 days. On the seventh and 14-1485004059 th postoperative days, we calculated the area and percentage of lesion contraction. The animals were sacrificed on the 14-1485004056 th postoperative day and cutaneous section of the injured region was collected for histomorphometric evaluation of the cellularity, neovascularization, thickness of the epidermis and volume density of collagen fibers colored with H&E and Picross Sirius respectively. For the statistical analysis, we applied the ANOVA test. Results: the G658 presented higher cellularity than GC (p = 0.03). The animals in the G658 group showed a significant increase in the neovascularization in relation to the CG (p = 0.01). Type III collagen significantly increased in G904 compared to G830 (p < 0.0001) and CG (p < 0.0001). The G658 had a * LSB: Master student, significant increase in type III collagen fibers compared to G830 (p < 0.0001) and GC (p < 0.0001). We found no significant difference in the thickness of the epidermis, wound area, and in the percentage wound of contraction between the analyzed groups. Conclusion: PBM was effective to stimulate the tissue repair process, with better results for the 658 nm wavelength.Introdução: A Fotobiomodulação (FBM) auxilia nos processos de angiogênese e mitose celular após lesão cutânea, contribuindo para reparo do tecido. Objetivo: investigar os efeitos da fotobiomodulação (durante a fase proliferativa) com comprimento de onda de 658 nm, 830 nm e 904 nm no reparo de lesões cutâneas em modelo animal. Método: FBM 658 nm (G658), 830 nm (G830), 904 nm (G904) e controle (GC) integraram a pesquisa. Os animais foram submetidos a uma ferida excisional e receberam tratamento em diferentes comprimentos de por 14 dias. No 7º e 14º dia pós-operatório, calculou-se a área e a porcentagem de contração da lesão. Os animais foram sacrificados no 14º dia pós-operatório e a secção cutânea da região lesada foi coletada para avaliação histomorfométrica da celularidade, neovascularização, espessura da epiderme e densidade volumétrica das fibras colágenas, corados com H&E e Picross Sirius respectivamente. Para a análise estatística, foi aplicado o teste ANOVA. Resultados: o G658 apresentou maior celularidade que GC (p = 0,03). Os animais do grupo G658 apresentaram aumento significativo da neovascularização em relação ao GC (p...

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Effect of Laser (670 nm) on Healing of Wounds Covered with Occlusive Dressing: A Histologic and Biomechanical Analysis

Abstract: Greater interference of the laser-treatment procedure was noted with 7 days of stimulation, and the occlusive dressing did not alter its biostimulatory effects.

Cited by 20 publications

References 22 publications

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Penetrating effect of high-intensity infrared laser pulses through body tissue

The photobiomodulation (658, 830 and 904nm) on wound healing in histomorphometric analysis

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