Navegação Periódicos - Resumos por ano de publicação "2004"

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  • IPEN-DOC 11228

    KOHARA, E.K. ; CRUZ, D.R.; WETTER, N.U. ; RIBEIRO, M.S. . Effects of low-intensity laser therapy on the Orthodontic movement velocity of human teeth: a clinical study. Brazilian Dental Journal, v. 15, Special issue, p. 84-84, 2004.

    Abstract: Low-intensity laser therapy (LILT) has been studied in many fields of Dentistry, but, to our knowledge, it is the first time that its effects on orthodontic movement velocity in humans are investigated. In our study, eleven patients were recruited for a two-month study. One half of the upper arcade was considered control group and received mechanical activation of the canine teeth every thirty days. The opposite half received the same mechanical activation and was also irradiated with a diode laser (?=780nm) on ten points around the root, during 10s with 20 mW, 5 J/cm2, on four days of each month. Data of the biometrical progress of both groups were statistically compared. All patients showed significant higher retraction velocity of the canines on the laser treated side when compared to the control. Conclusion: Our findings suggest that LILT does accelerate human teeth movement and could therefore considerably shorten the whole treatment duration.

    Palavras-Chave: teeth; orthodontic treatments; semiconductor lasers; light emitting diodes; therapy; bone tissues

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  • IPEN-DOC 08225

    EDUARDO, F.P.; NICOLLI FILHO, W.; MIGLIORATI, C.A.; ZEZELL, D.M. ; EDUARDO, C.P.; SCHUBERT, M.M.. Effects of low intensity laser radiation in the prevention of oral mucositis in patients undergoing bone marrow transplant. Brazilian Dental Journal, v. 15, Special issue, p. 97-97, 2004.

    Abstract: Oral mucositis is one of the complications arising from pre bone marrow transplant conditioning, which can substantially change the patient's quality of life. The purpose of this randomized double blind study was to compare the effects of low intensity laser radiation in the prevention of oral mucositis in patients undergoing bone marrow transplants. Seventy patients at the Seattle Cancer Care Alliance in the U.S.A. were approved by the local ethics committee and gave their informed consent to take part in the study. The 70 patients were divided into three groups (group 1 - laser 650nm; group 2 - laser 780nm and group 3 placebo). The therapy or placebo treatment began on the first day of the conditioning and continued through to two days following the bone marrow transplant. Mucositis was measured according to the oral mucositis rate and the pain assessment rate (VAS). We were thus able to conclude that the diode 650nm laser indeed decreased the severity of oral mucositis as well as the degree the pain when used as a preventative therapy in patients undergoing bone marrow transplants. In this study, low intensity laser therapy was regarded as safe and did not present any side effects.

    Palavras-Chave: low dose irradiation; oral cavity; mucous membranes; lasers; semiconductor diodes; transplants; bone marrow

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  • IPEN-DOC 13675

    NUNEZ, SILVIA C.; RIBEIRO, MARTHA S. ; GARCEZ, AGUINALDO S.; NOGUEIRA, GESSE E.C. ; LAGE MARQUES, JOSE L.. Effects of He-Ne Laser on blood microcirculation during wound healing process. Lasers in Surgery and Medicine, v. suppl. 16, p. 4, 2004.

    Palavras-Chave: blood flow; flowmeters; therapy; skin; repair; lasers; doppler effect

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  • IPEN-DOC 08253

    ANA, P.A. ; ROCHA, R.M.M.; BLAY, A.; AUN, C.E.; LAGE-MARQUES, J.L.; ZEZELL, D.M. . Effects of Er, Cr:YSGG Laser irradiation on endodontics system permeability. Brazilian Dental Journal, v. 15, Special issue, p. 99-99, 2004.

    Abstract: The aim of this study was to evaluate the effects of Er,Cr:YSGG laser irradiation on root dentin permeability. Twenty extracted single-rooted teeth were instrumented with K-files and divided in four groups, according to laser fluences: GI (non-irradiated), GII (12.5 mJ/pulse; 2.8 J/cm2), GIII (25 mJ/pulse; 8.5 J/cm2) and GIV (75 mJ/pulse; 16.98 J/cm2). Lased groups had an association of irrigating solution EDTA-T and Er,Cr:YSGG laser irradiation, which was performed at 20 Hz repetition rate without airwater spray, with four helicoidal movements during approximately 5 seconds. NDP associated with rhodamine B dye was used to evaluate dentin permeability. After the experimental period, the samples were transversely cut into six 2.0 mm thick slices for subsequent reading using the ImageLab software. The results showed that dentin permeability of root canals was decreased when exposed to Er,Cr:YSGG laser irradiation compared with non-irradiated samples, and this alteration was higher when higher fluences were applied. The cervical and middle thirds had permeability values statistically similar (p > 0.05) and significantly greater than the apical third. It can be concluded that the use of Er,Cr:YSGG laser irradiation at the utilized parameters decreases dentin permeability, favoring the root canal sealing.

    Palavras-Chave: dentin; laser radiation; permeability

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  • IPEN-DOC 13052

    KOHARA, E.K. ; KATO, I.T.; WETTER, N.U. . Effects of 960nm diode laser irradiation and fluoride on calcium solubility of dental enamel in vitro. Brazilian Dental Journal, v. 15, Special issue, p. 112-112, 2004.

    Abstract: The aim of this study is to determine the effects of diode laser (?=960 nm) irradiation on calcium solubility of dental enamel. Sixty enamel specimens were prepared from human teeth and divided into four groups (control, fluoride, laser and fluoride plus laser). Prior to the irradiation a vegetable coal diluted in physiological solution was applied to the enamel surface and the specimens were irradiated using 6,5 W of peak power, 5 ms of pulse duration, 10 Hz of repetition rate, fluency of 3,7 J/cm2 and time exposure of 10 seconds. The acidulated phosphate fluoride was applied for 4 minutes. Next, the specimens were immersed in lactic acid for 24 hours at 37 °C. The calcium content in demineralization solution was evaluated with Inductively Coupled Plasma Atomic Emission Spectrometry. The results indicate an increase in calcium solubility (12%) after laser irradiation, however, not statistically significant. When associated with fluoride, the decrease in calcium solubility did not differ from the results obtained with fluoride only. It can be concluded that in this experiment diode laser irradiation did not increase acid resistance of dental enamel.

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  • IPEN-DOC 01816

    THEODORO, L.H.; GARCIA, V.G.; ZEZELL, D.M. ; HAYPEK, P.; BACHMANN, L. ; SAMPAIO, J.E.C.. Effect of Er:YAG and diode lasers in the adhesion of blood components and in the morphology of irradiated root surfaces. Brazilian Dental Journal, v. 15, Special issue, p. 89-89, 2004.

    Abstract: The aim of this study was to evaluate in vitro the adhesion of blood components on root surfaces irradiated with Er:YAG (2.94??m) and GaAlAs Diode (808 nm) lasers and these effects on irradiated root surfaces. It was obtained 100 samples of human teeth. They were scaled and divided into five groups of 20 samples each: G1 (Control); G2 -Er:YAG laser (7.6 J/cm2); G3 - Er:YAG laser (12.9 J/cm2); G4 -Diode laser (90 J/cm2) and G5 - Diode laser (108 J/cm2). After these treatments were conducted, 10 samples of each group received a blood tissue, and the reminiscent 10 samples did not receive such treatment. After laboratorial treatments the samples were analysed by scanning electron microscopy. The results have shown that there were no significant differences between the Control Group and the groups treated with Er:YAG laser (p=0,9633 and 0,6229); G4 and G5 were less effective than the Control Group and the Er:YAG laser groups (p<0,01). No proposed treatment increased the adhesion of blood components in a significant way when compared to the Control Group; although the Er:YAG laser did not interfere in the adhesion of blood components it caused more changes on the root surface, while the Diode laser inhibited the adhesion.

    Palavras-Chave: teeth; blood; fibrin; lasers; erbium; in vitro; morphological changes

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  • IPEN-DOC 28989

    ROCHA, R.M.M. ; MENDES, F.M. ; ZEZELL, D.M. . Efeitos do filme PVC na performance do DIAGNOdent em lesões de cárie oclusal em dentes decíduos. Brazilian Oral Research, v. 18, Supplement, p. 240-240, 2004.

    Abstract: O objetivo deste trabalho foi avaliar a influência da utilização do filme PVC, como barreira de proteção, na performance do DIAGNOdent (DD) em lesões de cárie oclusal em dentes decíduos. Foram utilizados 21 molares decíduos que foram avaliados em 5 diferentes condições: (1) DD calibrado sem filme PVC na ponteira, (2) DD calibrado com uma camada de filme PVC e as amostras analisadas, (3) DD calibrado com 3 camadas de filme PVC e as amostras analisadas, (4) DD calibrado sem filme PVC e as amostras mensuradas com o DD com uma camada do filme, (5) DD calibrado sem filme PVC e as amostras mensuradas com o DD com 3 camadas do filme. A validação histológica foi feita por meio de lupa. Foi realizada ANOVA e teste de Tukey para comparação entre os valores obtidos em cada grupo. A área sob a curva ROC para lesões em dentina foi calculada e comparada entre os grupos. Usando o ponto de corte de 13, foi calculada a acurácia (teste de McNemar para comparação). Houve diferença significante entre os valores de medição (p < 0,05) entre os grupos 1 e 5; 1 e 3; 2 e 5. Obteve-se acurácia de 0,81 para os grupos 1, 2 e 3 e de 0,73 e 0,71 para os grupos 4 e 5, respectivamente, mas não houve diferença significante entre esses valores. A área sob a curva ROC mostrou diferença estatisticamente significante entre os grupos 2 e 4. Concluiu-se que, para melhor desempenho do DD, a ponteira do equipamento deve ser calibrada na mesma condição em que se pretende analisar as lesões. Condições que utilizam 3 camadas de PVC devem ser evitadas, para que não se subestime lesões de cárie em situações clínicas.

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  • IPEN-DOC 11177

    BARROSO, M.C.S.; WETTER, N.U. ; PELINO, J.E.P.. Dental bleaching efficacy with diode laser and LED irradiation: an in vitro study. Brazilian Dental Journal, v. 15, Special issue, p. 77-77, 2004.

    Abstract: Objective: This in vitro study evaluated the whitening efficacy of LED and diode laser irradiation during the dental bleaching procedure, using the two agents Opalescence X-tra and HP Whiteness. Background: Bleaching techniques achieved significant advances with the use of coherent or incoherent radiation sources to activate the bleaching chemicals. Methods: Atotal of 60 bovine incisors were randomly divided into six groups, three for each bleaching agent, receiving 1) only agent, 2) agent and LED irradiation at wavelength of 470 nm, 3) agent and 1.6 watt diode Laser at 808 nm. The results of the irradiations were characterized with the CIELAB system by measuring the L*a*b* values for the teeth before and after bleaching. Results: The average increase of the lightness value (CIELAB L*) of the different groups was 3-7 and the average chroma value decreased by 5-9. Conclusions: This is to our knowledge the first time that the light sources Laser and LED are compared with respect to their whitening capability when applied to different agents. Best overall results are obtained with the Whiteness HP and Laser association.

    Palavras-Chave: teeth; bleaching; enamels; semiconductor lasers; light emitting diodes

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  • IPEN-DOC 12991

    NUNEZ, S.C. ; GOMES, L.; GARCEZ, A.S.; LAGE-MARQUES, J.L.. Comparative study between photodynamic therapy and chemical solution on bacterial reduction in root canals. Brazilian Dental Journal, v. 15, Special issue, p. 85-85, 2004.

    Abstract: One of the major medical problems facing mankind in the next century will be the resistance of many pathogenic microbes to existing antibiotics. Oral bacteria can easily reach other body sites and also spread to other individuals. Therefore, antibiotic-resistant oral bacteria have the opportunity for rapid dissemination through the community and to transfer their resistance genes to other bacterial species. Photodynamic therapy involves the use of light-activated drugs which may offer an alternative approach to the use of traditional antimicrobial agents. The purpose of this study was to evaluate bacterial reduction in infected root canal. Thirty teeth with their root canals prepared were contaminated with Enterococcus faecalis. Control group was untreated. Chemical group was treated with sodium hypochlorite for 30 minutes and in the laser group, a photosensitizer paste was placed and maintained in the root canals for 5 minutes and irradiated with a diode laser, output power 10 mW and l= 685nm for 3 minutes. The bacterial reduction was significantly higher for laser group when compared to chemical and control groups. These results indicate photodynamic therapy as an effective method to kill E. faecalis.

    Palavras-Chave: photodynamic therapy; oral cavity; teeth; antimicrobial agents; microbial drug resistance

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  • IPEN-DOC 10875

    HAYEK, R.R.A.; YAMADA JUNIOR, A.M. ; GARCEZ, A.S.; NUNEZ, S.C. ; SUZUKI, L.C.; RIBEIRO, M.S. . Comparation between photodynamic therapy and a bactericidal solution in the treatment of dental alveolitis microbiological evaluation. Brazilian Dental Journal, v. 15, Special issue, p. 110-110, 2004.

    Abstract: Photodynamic therapy is a new therapeutic modality to treat microbial infections. The aim of this pilot study was to compare this new therapeutic approach with clorhexidine in mini pigs induced alveolitis. Alveolitis is an inflammatory disease that involves the superficial bone layer in the dental alveolus. Eight dental elements were extracted from mini pigs and immediately after the alveolus were contaminated with Streptoccocus aureus. After seven days the area presented edema and hyperemia. In the clorhexidine group the alveolus were debrided and irrigated with a 0.12% solution of clorhexidine. In Laser group the alveolus were debrided and photodynamic therapy was performed consisting in the application of a azulene paste inside the alveolus with a preirradiation time of 5 minutes followed by irradiation with a low power diode laser, ?= 685 nm, P= 50 mW, E= 9 J, for 3 minutes. Microbiological samples were harvested before and after treatment for both groups with sterile paper points. The results showed bacterial reduction in both groups, although photodynamic therapy was significantly more effective to reduce the population of S. aureus. This finding indicates that photodynamic therapy can be an alternative method to the treatment of alveolitis.

    Palavras-Chave: dentistry; photodynamic therapy; germicides; inflammation

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  • IPEN-DOC 11593

    SILVA, DANIELA F.T.; VIDAL, BENEDICTO C.; ZORN, TELMA M.T.; ZEZELL, DENISE M. ; RIBEIRO, MARTHA S. . Collagen birefrigence in skin samples following low-intensity polarized laser radiation. Lasers in Surgery and Medicine, p. p. 8, 2004.

    Palavras-Chave: skin; sample preparation; collagen; wounds; visible radiation; laser radiation; polarization

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  • IPEN-DOC 08431

    EDUARDO, P.L.P.; BACHMANN, L. ; SALVADOR, V.L.; ZEZELL, D.M. . Chemical Modification of bovine dental enamel irradiated with holmiun laser. Brazilian Dental Journal, v. 15, Special issue, p. 106-106, 2004.

    Abstract: This study investigated Ho:YLF (2,065 mm) effects on dental enamel with regards to the thermal variations in the pulp chamber during irradiation and resistance to demineralization. Twenty samples of bovine enamel were divided: 1) control- acidulated phosphate fluoride (APF) topic application followed by demineralization treatment with lactic acid; 2) Ho:YLF irradiation (100J/cm2) followed by APF and demineralization; 3) Ho:YLF irradiation (350J/cm2) followed by APF and demineralization; 4) Ho:YLF irradiation (450J/cm2) followed by APF and demineralization. All samples were quantified according to their calcium and phosphorous atoms relative concentrations before and after the treatments. X-Ray fluorescence spectrochemical analysis showed an increase on the calcium and phosphorous atoms concentration ratio and therefore the enamel demineralization reduction as a result of the lactic acid treatment in the samples irradiated with the holmium laser followed by the APF (ANOVA, Tukey p<0,01). To evaluate the feasibility of this study for clinical purposes, surfaces morphology were analyzed. Modifications were characterized by melted and re-solidified regions of the enamel, which can changes its permeability and solubility. Temperature changes of ten human pre-molars teeth irradiated with 350 J/cm2 and 450 J/cm2 were also monitored in the pulp chamber in real time. Temperature increases were limited to 4,2° C.

    Palavras-Chave: teeth; dentin; animals; cattle; enamels; laser radiation; holmium; chemical composition

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  • IPEN-DOC 01531

    BACHMANN, L. ; DIEBOLDER, R.; HIBST, R.; ZEZELL, D.M. . Changes in chemical composition and collagen structure of dentin tissue after erbium laser irradiation. Brazilian Dental Journal, v. 15, Special issue, p. 78-78, 2004.

    Abstract: The erbium laser light has a great affinity to the water molecule, which is present in great quantity in biological hard tissues. The objective of this work is to identify chemical changes by infrared spectroscopy of irradiated dentin by an Er:YAG - 2.94μm laser. The irradiation was performed with fluences between 0.365 J/cm2 and 1.94 J/cm2. For the infrared analysis a Fourier transform infrared spectrometer was used. After the irradiation were observed: loss of water, alteration of the structure and composition of the collagen and increase of the OH- radical. These alterations can be identified by a decrease of the water and OH- band between 3800-2800 cm-1, bands ascribed to collagen structure between 1400-1100 cm-1. The results show that the erbium laser changes the structure and composition of the organic matrix, OHradical and the water composition in the irradiated dentin.

    Palavras-Chave: dentin; bone tissues; teeth; erbium; lasers

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  • IPEN-DOC 06392

    PAIVA, P.F.; PAIVA, G.; NASR, M.K.; NUNES, L.J.; MOREIRA, L.A.; ZEZELL, D.M. . Cavity preparation with ER:YAG laser: pain evaluation. Brazilian Dental Journal, v. 15, Special issue, p. 94-94, 2004.

    Abstract: They were selected for this work clinic patient of the which were selected 15 teeth with decay lesion, being ten teeth with lesion type class I, of these five for the group-control with high conventional rotation, and five for the group laser class I, and five teeth with lesion type class Vfor the group laser. In the preparations with laser of Er:YAG (Kavo Key Laser 2), any patient do not was anesthetized, even in the deepest cavities, and the maximum degree of pain (that varied from 0 to 10) it was of 4. In the group-control, with mounted tip in high conventional rotation, two patients were anesthetized, and the maximum degree of pain was of 7. The use of the laser in the dental clinic (restorative dentistry), using the technology laser in the dental preparations, it showed to be a good alternative to the use of the mounted tip in high conventional rotation. 94

    Palavras-Chave: dentin; teeth; oral cavity; lasers; biological recovery; pain

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  • IPEN-DOC 14592

    SUZUKI, L.C.; YAMADA JUNIOR, A.M. ; HAYEK, R.R.A.; RIBEIRO, M.S. . A case report of photodynamic therapy on bacterial reduction before immediate implant. Brazilian Dental Journal, v. 15, Special issue, p. 127-127, 2004.

    Abstract: Recent studies have demonstrated that a number of oral bacteria can be killed by photodynamic therapy with low concentrations of dyes. Photodynamic therapy is the combination of light with appropriate wavelength and a photosensitizer. The antimicrobial activity is mainly mediated by singlet oxygen and/or free radicals generated by the photoactivated sensitizer. A flap surgery aiming an immediate implant was made in a residual root with periodontal lesion on upper first premolar. After the extraction, a microbiological sample with sterile paper points was harvested. Then, the photosensitizer was applied in the infected alveolus and irradiated with low-intensity laser, ?= 660 nm, P= 30 mW and E= 9 J . After the photodynamic therapy, a new microbiological sample was harvested. Subsequently, it was prepared the implant bed with conical burs and then the implant was placed. Patient was medicated with antibiotic after surgery. The microbiological analysis showed a significant reduction of Prevotella sp., Fusobacterium sp. and Streptococcus beta-hemoliticus. This finding suggests that photodynamic therapy is an alternative method to disinfect alveolus before implant placement. Therefore, this study highlights the need for future work in the area of photodynamic therapy to reduce bacteria without harming host tissue.

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  • IPEN-DOC 04452

    KOGLER, V.L.; MAIO, M.; LAGE-MARQUES, J.L.; ZEZELL, D.M. . Carbon dioxide laser or cold scalpel on the removal of gingival melanin pigmentation: comparative study. Brazilian Dental Journal, v. 15, Special issue, p. 90-90, 2004.

    Abstract: Melanin pigmentation is the result of melanin granules produced by melanocytes present in the basal layer of the oral epithelium. Gingival physiological melanin pigmentation is symmetric and persistent, may cause esthetic problems especially in individuals with a gummy smile. Various techniques have been described for the removal of melanin pigmentation from the gingival epithelium and partial thin connective tissue, as chemical agents, cryosurgery, surgery and gingival grafts. Recently, lasers systems have been used to coagulate and vaporize cells, promoting controlled gingival ablation. This study compares clinical efficiency to removal gingival melanin pigmentation in 20 patients with dioxide carbon laser, and 20 patients with cold scalpel during 30 days after surgery. A dioxide carbon laser (output = 5W; superpulse = 0,5s; spot size = 2,5mm defocused; focal distance = 5,5cm, Intensity = 102 W/cm2) was irradiated on gingival mucosal surface. Both techniques presented epithelialization in 15 days. Both systems are considered effective for removal melanin pigments. Patient's evaluation with postoperative pain found the carbon dioxide laser technique superior to the cold scalpel one. After 30 days, the repigmentation occured in 45% of the dioxide carbon laser patients, and 80% of the cold scalpel patients.

    Palavras-Chave: carbon dioxide lasers; melanin; pigments; lasers

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  • IPEN-DOC 05446

    ANDRADE, A.K.P.; FEIST, I.S.; CAI, S.; PANNUTI, C.; ZEZELL, D.M. ; DE MICHELI, G.. Bacterial reduction in class II furcation after root debridment with or without Nd:YAG laser irradiation. Brazilian Dental Journal, v. 15, Special issue, p. 90-91, 2004.

    Abstract: The use of Nd:Yag laser for bacterial reduction as an adjuvant to nonsurgical periodontal treatment has been approached in several studies. Furcation complex anatomy is responsible for comprised treatment results in this areas due to the lack of proper access for instrumentation showing the persistence of a pathogenic microbial flora. The purpose of this clinical trial, randomized, double-blinded was to evaluated the bacterial reduction achieved with the Nd:YAG associated to conventional treatment on furcation sites of patients with chronic periodontitis. In a split mouth design study, 34 class II furcations that were selected from 17 patients with chronic periodontitis. They received previous full mouth periodontal treatment, except for the experimental sites. The 17 furcations of the Control group underwent twice manual and ultrasonic root debridment in weekly intervals. The Test group received the same treatment as the Control group followed by the Nd:YAG laser application (100mJ/pulse; 1.5W; 15Hz; 60sec). The microbiological parameters total numbers of anaerobic Colony Forming Units(CFU); Black pigmented CFU and the level of Actinobacillus actinomycetemcomitans(Aa), Porphyromonas gingivalis (Pg) and Prevotella intermedia(Pi) were determined at baseline, immediatly and one month after the treatment. The results showed a significant reduction of total CFU for both groups immediately after the treatment, but it was better for the Test group. After one month the total CFU average increased but was still below pretreatment levels for both groups. The black pigmented CFU and the level of Aa, Pg e Pi decreased significantly after the treatment but 30 days after there was an increase almost equal to baseline levels for both groups. The Nd:Yag laser associated with convencional treatment promoted bacterial reduction on class II furcation immediately after its application.

    Palavras-Chave: bacteria; laser radiation; lasers; clinical trials

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  • IPEN-DOC 11770

    YAMADA JUNIOR, A.M. ; HAYEK, R.R.A.; GIOSO, M.A.; FERREIRA, J.; BATISTA SOBRINHO, C.A.; RIBEIRO, M.S. . Bacterial reduction by photodynamic therapy in peri-implantitis: an in vivo study. Brazilian Dental Journal, v. 15, Special issue, p. 84-84, 2004.

    Abstract: Progressive peri-implantar bone losses, which are accompanied by inflammatory process in the soft tissues is referred to as peri-implantitis. The aim of this study was to compare the effects of lethal photosensitization with the conventional technique on bacterial reduction in ligature induced peri-implantitis in dogs. Seventeen third premolars of eight Labrador dogs were extracted and, immediately after, the implants were submerged. After osseointegration, peri-implantitis was induced. After 4 months, ligature were removed and the same period was waited for natural induction of bacterial plaque. The dogs were randomly divided into two groups. In the conventional group, they were treated with the conventional techniques of mucoperiosteal flaps for scaling the implant surface and irrigation with chlorexidine. In the laser group, only mucoperiosteal scaling was carried out before photodynamic therapy. On the peri-implantar pocket an azulene paste was introduced and a GaAlAs low-power laser (l= 660 nm, P= 30 mW, E= 5,4 J and Dt= 3 min.) was applied. Microbiological samples were obtained before and immediately after treatment. The results of this study showed that Prevotella sp., Fusobacterium e S. Beta-haemolyticus were significantly reduced for the conventional and laser groups (100%,99.8%; 100%,100%; 85.7%,97.6%, respectively).

    Palavras-Chave: dentistry; teeth; implants; bone tissues; bacteria; photodynamic therapy; lasers; photosensitivity

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  • IPEN-DOC 28988

    ANA, P.A. ; BLAY, A. ; TURBINO, M.L. ; ZEZELL, D.M. . Análise de microdureza de esmalte irradiado com laser Er,Cr:YSGG em baixas fluências. Brazilian Oral Research, v. 18, Supplement, p. 235-235, 2004.

    Abstract: As modificações nas propriedades químicas do esmalte irradiado provocadas por laser podem indicar o uso deste tratamento como um mecanismo para prevenção da cárie. Este estudo in vitro objetivou avaliar o efeito da irradiação do laser Er,Cr:YSGG em baixas fluências na microdureza do esmalte. Quinze blocos de esmalte foram obtidos de dentes terceiros molares humanos recém-extraídos. As amostras foram embutidas em resina acrílica e foram seccionadas transversalmente em duas porções, sendo uma parte irradiada e outra mantida como controle. Após o polimento, as amostras foram divididas em três grupos e irradiadas de acordo com as seguintes fluências: 2,8 J/cm2 (12,5 mJ/pulso), 5,6 J/cm2 (25 mJ/pulso), e 8,5 J/cm2 (37,5 mJ/pulso). As irradiações foram realizadas com taxa de repetição de 20 Hz, com ausência de spray ar-água e sob a forma de varredura. As superfícies seccionadas das amostras foram submetidas à análise de microdureza Vickers, realizando-se vinte indentações por amostra. Os resultados foram convertidos em porcentagens e submetidos à análise de variância, com p < 0,05. Os resultados mostraram que a microdureza do esmalte dental foi significativamente aumentada nas amostras irradiadas em comparação com as não-irradiadas e as mudanças obtidas foram dependentes das fluências utilizadas. A irradiação com laser Er,Cr:YSGG em baixas fluências pode aumentar a microdureza superficial do esmalte, o que pode indicar um aumento na sua resistência ácida. Conseqüentemente, o laser Er,Cr:YSGG tem potencial para ser utilizado na prevenção da cárie.

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  • IPEN-DOC 08368

    ANA, P.A. ; VELOSO JUNIOR, W.F.; CLAUDIO, T.; ZEZELL, D.M. . 3D-Finite element and thermographic analysis of human teeth irradiated with ErCrYSGG. Brazilian Dental Journal, v. 15, Special issue, p. 99-99, 2004.

    Abstract: The purpose of this study was to analyse surface and pulpal temperature changes in extracted human teeth subjected to Er,Cr:YSGG laser irradiation by using Finite Element Method (FEM) and comparing with thermal analysis made by thermocouple and thermocamera. Twelve extracted human molar teeth were selected and divided into three groups, according to the following Er,Cr:YSGG laser irradiation conditions: 2.8 J/cm2, 5.6 J/cm2 and 8.5 J/cm2. During laser irradiation, surface temperature was measured using a thermocamera (FLIR Systems - USA) and the pulpal temperature was monitored by means of a thermocouple type T placed in the pulpal chamber. For FEM analysis, it were constructed numerical models that reproduced a typical sound molar teeth and the analysis simulated the absorption of the laser energy and the heat transfer through the tooth in three dimensions, considering the same laser energy and conditions performed in thermocouple and thermocamera measurements. The results showed that theoretical FEM calculation showed good agreement with the thermocamera and thermocouple obtained data, simulating heat transfer and predicting the temperature increase. It was possible to conclude that 3D Finite Element Method gives good results that makes possible to understand the thermal behavior of dental material.

    Palavras-Chave: teeth; finite element method; thermography; laser radiation

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✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

✔ Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.