Navegação Periódicos - Resumos por ano de publicação "2004"

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  • IPEN-DOC 13002

    TODESCAN, C.D.R.; VIEIRA JUNIOR, N.D. ; SAMAD, R.E. ; FREITAS, A.Z. ; EDUARDO, C.P.. Ultrashort pulses over bovine dental enamel. Brazilian Dental Journal, v. 15, Special issue, p. 91-91, 2004.

    Abstract: The interaction of lasers with the hard structures of the teeth, has found the excess of heat as a problem for its utilization. This study analyzes, in vitro, the interaction of the ultrashort pulse laser of Ti:safire (830 nm) with the bovine dental enamel. The system consisted in one main oscillator integrated with an amplifier (CPA). The pulses extracted before the temporal compression inside the amplifier had 30ps, 1000Hz and ~1mJ. The pulses extracted after the compression had 60fs, 1000Hz and ~0,7mJ. The M2 was 1,3, the focal lens 2,5 cm, the focal distance 29,7 and a computadorized translation stage x,y,z moved the sample. We evaluated the amount of tissue removed per pulse,the resulting cavities and the surrounding tissues not irradiated, under OM and SEM. The fluency was the major factor for differentiating the two regimens studied, therefore, the intensity was not so important as we expected in this process. We found: one ablation region in "cat tonge", one ablation length, one fluency ~0,7J/cm2 for 30ps and ~0,5J/cm2 for 60fs (50% ofhigh speed burr), smooth edge for 30ps and high precision of the shrp edge cut of submicrometric order for 60fs.

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  • IPEN-DOC 13005

    ARCHILLA, J.R.F.; TANNOUS, J.T.; PELINO, J.E.P.; FREITAS, P.M.; SILVA, D.F.T.; RIBEIRO, M.S. . Spectroscopic analysis and interaction of different bleaching agents with 660n laser and 470 nm LED. Brazilian Dental Journal, v. 15, Special issue, p. 100-100, 2004.

    Abstract: The aim of this in vitro study was to verify the effect of different dental bleaching methods regarding the achromatic enamel color change. Forty-five bovine teeth were immersed in a darkening solution and then divided into nine experimental groups with five samples in each group. The color measurement was initially taken using a digital colorimeter. The teeth were submitted to the bleaching with three bleaching gels, without any activation source (control) and with two wavelengths (660 nm diode laser and 470 nm LED). The previous analysis of the absorption spectra enabled the choice of an adequate wavelength in order to enhance its photochemical action. The second color measurement was taken after all the treatments. The data were submitted to ANOVA and Tukey parametric statistical tests (p=0,05). It was observed that: 1) there was a statistical significant difference between the activation sources; 2) there was statistical significant difference regarding the interaction among the activation sources and the bleaching gels when compared with each other. The activation methods of the bleaching agents, even promoting color changes in distinct levels, still require further studies capable of detecting a higher absorption spectrum of a product and which presents significant clinical results.

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  • IPEN-DOC 12376

    NUNEZ, S.C. ; GOMES, L.; GARCEZ, A.S.; MULLER, K.P. ; JORGE, A.O.C.; RIBEIRO, M.S. . Photodynamic action of toluidine blue in streptococcus mutans by fluorescence spectroscopy. Brazilian Dental Journal, v. 15, Special issue, p. 84-85, 2004.

    Abstract: The antimicrobial activity of toluidine blue associated with red light has been demonstrated for a wide range of microorganisms including those commonly found in infected root canals, carious lesions and periodontal pockets. Recent reports have drawn attention to the problems of antimicrobial resistance and resistance of oral bacteria to antibiotics and local antiseptics is of increasing concern, thus photodynamic therapy could be an alternative antimicrobial approach to treat localized infections in oral cavity. In this study the fluorescence spectra of TB were obtained before and after laser exposure in the presence or absence of Streptococcus mutans. The dye concentration was 0.01%, the irradiation was performed with a diode laser, l= 660 nm, P= 40mW, exposure time of 3 minutes in a volume of 0.5 ml, with a pre-irradiation time (PIT) of one or five minutes. The results showed shifts in fluorescence spectra observed for different preirradiation times in the presence of S. mutans. In the absence of bacteria, a shift in the spectra was observed in the dye before and after irradiation. These findings may indicate a photobleaching of the dye denoting structural alterations after irradiation and confirm the importance of the PIT for the success of this therapy.

    Palavras-Chave: dentistry; caries; bacteria; antimicrobial agents; toluidine blue

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  • IPEN-DOC 10306

    ZEZELL, D.M. ; MIYAKAWA, W.; RIVA, R.; WATANUKI, J.T.. Monte-Carlo Modelling of light propagation in hard dental tissues. Brazilian Dental Journal, v. 15, Special issue, p. 131-131, 2004.

    Abstract: In the Monte-Carlo model, we simulated the propagation of visible light and the temperature distribution in human tooth, which reflects the energy deposited in the tooth by the laser. As a turbid medium, differences in absorption and scattering coefficients of the enamel and dentine must be taken into account. These data are not completely established in the literature in the visible range. The results are compared with experimental data of Cu-HyBrID laser light propagation in human molar teeth, in order to evaluate the scattering coefficient. The Cu-HyBrID laser emits green (510 nm) and yellow (578 nm) radiation with high output peak power (20 kW) at high repetition rates (13.7 kHz) and there is almost no report of its use in Dentistry. This work aims to correlate the Cu-HyBrID energy deposition with the tooth thermal response. The tooth is predominantly a scattering medium (absorption much lower than scattering) and small variations in the absorption coefficient do not reveal significant alterations in the light distribution curve. According to the simulation, most of the laser energy is accumulated on enamel-dentine junction and the tooth thermal response is strongly affected by the value of the absorption coefficient, which is not yet precisely known.

    Palavras-Chave: dentin; teeth; laser radiation; monte carlo method; simulation; enamels

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  • IPEN-DOC 03452

    FARHART, P.B.A.; TANJI, E.Y.; FARHAT, R.P.; ZEZELL, D.M. ; MIYAKAWA, W.; NOGUEIRA, G.E.C.. Model of thermal and optical effects in dental pulp during the neodymium and diode lasers irradiation. Brazilian Dental Journal, v. 15, Special issue, p. 90-90, 2004.

    Abstract: Applications of high intensity lasers in the enamel and dentine can produce adverse thermal effects into the pulp. Since the evaluation thermal effects into the intact pulp is not a solved problem, extracted teeth models have been used frequently. Current models, however, simulate only tooth thermal properties, not taking the remaining radiation in the pulp chamber into account. The aim of this study was to verify if the remaining radiation from neodymium and diode lasers that reach the pulp chamber, at the models using extracted bovine teeth, can causes local thermal effects. For this purpose, two models were developed using extracted bovine teeth with their pulp chambers filled with: water (model 1) and with an optical absorbent (model 2). Models were radiated with 1 W. The obtained results show that, for both lasers, the temperature rise in model 2 pulp chamber is: i) up to 11% higher than in the model 1 when the enamel is radiated and ii) up to 37% higher than in the model 1 when dentine is radiated (1 mm from the pulp). Thus, remaining radiation into the pulp is relevant for the above mentioned lasers and doses.

    Palavras-Chave: biological radiation effects; dentin; dentistry; enamels; laser radiation; temperature dependence

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  • IPEN-DOC 13050

    KOHARA, E.K. ; WETTER, N.U. ; RATTICHIERI, F.; KATO, I.T.. Microhardness of the dental enamel surface after irradiation with 960nm diode laser. Brazilian Dental Journal, v. 15, Special issue, p. 111-112, 2004.

    Abstract: Several authors analyzed laser irradiation of dental enamel in an attempt to increase acid resistance and achieve caries prevention. In some cases, the procedure has also been associated to the application of a layer of fluoride. Micro-hardness measurements are reliable tests used to determine the degree of resistance to demineralization. In this work micro-hardness values of superficial dental enamel have been measured before and after irradiation with a 960 nm diode laser, using tested laser parameters that are safe and cause no injuries to the adjacent tissue. Laser parameters were below the dental enamel ablation threshold. 60 enamel samples were used and divided into control group (GC), fluoride application (GF), laser irradiation (GL), fluoride application with subsequent laser irradiation (GFL) and laser with subsequent fluoride application (GLF). A solution containing coal was used on the enamel surface in order to absorb the laser radiation. A statistically significant loss of the micro-hardness value was obtained for all groups except for GL but also this group did not produce significant micro-hardness increase. Conclusion: at the current peak power and beam quality of standard diode laser bars, safe laser parameters do not produce higher micro-hardness values.

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  • IPEN-DOC 13067

    LOLLATO, R.F.; GROTH, E.B.; RIBEIRO, M.S. . Low-intensity laser therapy and functional orthopedics in the treatment of pain from temporomandibular disfunction. Brazilian Dental Journal, v. 15, Special issue, p. 114-114, 2004.

    Abstract: Temporomandibular Disfunction (TMD) is a term used to describe disorders, which involve temporomandibular joint (TMJ), masticatory muscles, and associated structures, isolated or not, whose most frequent symptom is pain. The aim of this study was to evaluate pain and buccal mobility in subjects with Cl II malocclusion and TMD symptoms, treated with low-intensity laser therapy (LILT) and functional orthopedics (FO), associated or not. Eighteen subjects were selected and divided into three groups. Group 1 was treated with LILT, l = 780nm, 70 mW, 15 J/cm2 per point during two weeks. The application was in three points around the TMJ, and trigger points of masticatory muscles. Group 2 received Planas functional appliances and it was evaluated once a week during two weeks. Group 3 received both treatments at the same time, and the first laser application coincided with the appliance installation. Subjects answered a questionnaire with a score for pain evaluation after palpation. There was pain relief for the 3 groups and no statistical differences were observed among them, however, group 3 showed a remission of pain faster than other groups. This finding indicates the association of the LILT with FO for pain relief in TMD.

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  • IPEN-DOC 01757

    EDUARDO, L.R.P.; RIBEIRO, M.S. ; DUARTE, M.; ZEZELL, D.M. . Low level laser therapy in treatment of TMJ and masticator muscles disease: biometrical and pain evaluation. Brazilian Dental Journal, v. 15, Special issue, p. 87-87, 2004.

    Abstract: A sample of 11 patients showing temporomandibular joint disease, in one or both sides, was selected. Clinical examinations were performed on patients to define which side was the most compromised by the disease. Only the worst side was chosen to be treated by the laser therapy. The Laser Unit used was a diode laser (AlGaAs) in which the wavelength was 810 nm (infra-red spectrum). Irradiations were done in tree points of TMJ, with 22,5 J/cm2; two points in the masseter muscle, with 15 J/cm2; and tree points in the temporal muscle, with 7,5 J/cm2. All points were irradiated for 30 seconds. The other side, of lesser complaint received a sham therapy. Treatment was done during two weeks, tree irradiation with 48 hours interval in the first week, and two irradiations with the same interval in the second week. Patients reported improvement in relation to the level of pain, mainly after the forth irradiation, and the level of pain decreased until the last day of treatment. In relation to the degree of mouth opening, the majority of patients showed a significant increase, mainly after the fifth day of irradiation.

    Palavras-Chave: laser radiation; therapy; muscles; jaw; pain

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  • IPEN-DOC 14036

    MULLER, K.P. ; YAMADA JUNIOR, A.M. ; SUGAYAMA, S.T.; RIBEIRO, M.S. . Local Treatment using high and low-power laser on herpes simplex. Brazilian Dental Journal, v. 15, Special issue, p. 119-119, 2004.

    Abstract: Herpes simplex (HSV) is commonly encountered in the dentistry practice disappearing after 10 to 14 days. Recently alternative treatments have been introduced, among those laser therapy. The aim of this study is to evaluate the efficacy of laser therapy in patients with perioral herpes simplex infection. A 32 years old female was treated with high-intensity laser therapy (HILT) in vesicle phase using a Nd:YAG laser, l= 1064 nm, P= 1,5 W, f= 15 Hz on days 1 and 2 to drainage the vesicles. Low-intensity laser therapy (LILT) was applied on the affected area in the 3 consecutive days with a GaAlAs laser, l= 830 nm, D= 5 J/cm2. On the other hand, a 7 years male patient, which presented the vesiculo-ulcerative stage, only LILT (l= 660 nm, D= 4 J/cm2) was carried out. For both cases, it was observed that the course of the infection was quicker than the normal. Seven days after treatment beginning the lesions were healed. These findings suggest that LILT associated or not to HILT is a efficient and promising treatment for HSV. Further larger studies aiming at confirming these data and investigating the LILT mechanisms of action should be performed.

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  • IPEN-DOC 11594

    SILVA, DANIELA F.T.; MIYAKAWA, WALTER; ZEZELL, DENISE M. ; RIBEIRO, MARTHA S. . Light attenuation in health and burned rat skin samples. Lasers in Surgery and Medicine, p. 10, 2004.

    Palavras-Chave: visible radiation; burns; rats; animals; skin; therapy; distribution; scattering

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  • IPEN-DOC 08515

    FERNANDES, A.S.F.; NAVARRO, R.S.; GONTIJO, I.; HAYPEK, P.; ZEZELL, D.M. ; HADDAD, A.E.. Intrapulpar temperature variation in primary teeth during cavity preparation using: Er:YAG laser and conventional high-speed drill. Brazilian Dental Journal, v. 15, Special issue, p. 106-107, 2004.

    Abstract: Increases of temperatures superior than 5-5.5°C can compromise the pulp vitality. The purpose of this in vitro study was to compare the variation of the pulp temperature in primary teeth during the cavity preparation. Twelve primary lower incisors (Human Tooth Bank-FOUSP) were divided in 4 groups (n=3): cavity preparations were performed at buccal surface, refrigerated by air-water spray, during 20sec, using #1090 diamond burr in highspeed drill in carious-free incisors (G I) and carious incisors (G II); or Er:YAG laser (2.94μm)(KaVo 3)(LELO-FOUSP), with 6Hz repetition rate/ 600mJ energy as orientated by manufacturer, in carious-free incisors (G III) and carious incisors (G IV). The variation of temperature was measured using digital oscilloscope and thermocouple type K placed inside the pulpar chamber, simultaneously the teeth was kept under water thermal bath during the procedures. The temperatures rises were less than 4ºC in all cavities preparations in different groups, the variation of temperature in laser and conventional high-speed drill groups showed similar values. The groups of carious teeth showed higher increase of temperature than carious-free teeth. The Er:YAG laser demonstrated be a safe alternative for cavities preparations in primary teeth, since that using effective and safety parameters by qualified and trained professionals.

    Palavras-Chave: teeth; temperature dependence; caries

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  • IPEN-DOC 13014

    CAMARGO, A.; BALDOCHI, S. ; CAMARGO, S.; EDUARDO, C.P.. "In vitro" evaluation of morphologic changes on the root dentine irradiated by CO2 laser associated or not to calcium hydroxide. Brazilian Dental Journal, v. 15, Special issue, p. 102-103, 2004.

    Abstract: This in vitro study has evaluated the structural changes on the root dentine irradiated by a CO2 laser associated or not to calcium hydroxide - an alternative method for dentine hypersensitivity treatment. Fourteen human teeth 3rd molars were utilized, divided into 7 groups. Group I (control group),Groups II, III and IV received an application of Ca (OH)2 paste followed by CO2 laser irradiation for 5 seconds, intervals of 10 seconds, continuous emission, power of 0.5W, constant distance of 30mm (Group II), 1.0W (Group III), 1.5W (Group IV); Groups V, VI, VII received laser irradiations following the same parameters applied to groups II, III, and IV. Morphologic changes suggesting to fusion and re-solidification were observed, and the presence of material obstructing the whole analyzed surface on groups II, III, and IV. For groups V, VI, and VII, fusion, re-solidification, and cracks, were observed, results statistically significant (P<0,01). No statistically significant differences were observed in groups that used the same treatment. Powers above 1.0W (DP=125,38W/cm2) showed carbonization and dark surface, results unfavorable due to the undesirable morphologic alterations and aesthetic compromising.

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  • IPEN-DOC 06281

    GUIMARAES, J.G.A.; MIYAKAWA, W.; STOLF, S.F.; SILVA, E.M.; ZEZELL, D.M. ; EDUARDO, C.P.. In vitro thermographic measurement in pulpal chamber during diode laser bleaching. Brazilian Dental Journal, v. 15, Special issue, p. 94-94, 2004.

    Abstract: Thermographic was employed to determine the temperature rise in lower incisors pulpal chambers during diode laser bleaching. Two methods were used: a thermocouple for 72 teeth and a infrared (IR) thermographic camera for 36. Two bleaching agents, both 35% hydrogen peroxide- Whiteness HP (HP) and Hi Lite (HL) - were applied to the specimens buccal surfaces and irradiated with a diode laser (808 5nm), CW for 30s. Intensities tested were 21.W/cm2, 29.8W/cm2, 35.8W/cm2, 38.2W/cm2, 52.9W/cm2 e 63.7W/cm2. Means of the greatest temperature rises with the HL were statiscally lower than the HP (p<0.01). When HP was irradiated with 50.9W/cm² and 61.1W/cm², the temperature registered was over 5.5ºC, considered as the limit to avoid pulp damage. The IR thermacam analysis showed that, when the HP was used, the temperature rise in pulp chamber was similar to the target area on the buccal surface. Evaluation of tooth color was done using a VITAshade guide at baseline and at the end of the bleaching treatment. Both products proved to be efficient, however HP produced statiscally higher shade changes than HL (p<0.01). It can be concluded that the diode laser bleaching associated with the HP was safe when intensities below 50mW/cm2 were employed. Higher parameters can cause damage to pulp vitality of the lower incisors, fact that did not occurred with the HL gel. Both gels were efficacious to the bleaching technique proposed, but the HP showed better results.

    Palavras-Chave: dentin; teeth; bleaching; thermography; hydrogen peroxide; semiconductor diodes; lasers

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  • IPEN-DOC 05701

    GONTIJO, I.T.; CIAMPONI, A.L.; ZEZELL, D.M. ; NAVARRO, R.; RODRIGUES, W.; CIAMPONI, A.L.. In vitro and in vivo evaluation of deciduos teeth withening technique: the diode laser and light cure. Brazilian Dental Journal, v. 15, Special issue, p. 93-93, 2004.

    Abstract: A great number of children suffer from traumatic injuries on the deciduous dentition. The darkening resulting from these injuries create an aesthetic probem in these children in the middle of their psychosocial development. The whitening technique might be a satisfactory aesthetic resolution, as well as non-invasive. The objectives of the present study were to evaluate "in vitro" and "in vivo" the teeth color variation and superficial temperature, obtained by the thermocatalytic technique used in devitalized human deciduous teeth, as well as evaluate "in vivo" the teeth color variation obtained by the whitening. The whitening agent was the hydrogen peroxide 35%,having as a variant the source of catalyzing energy- diode laser and the light curer. 21 deciduous teeth were utilized. The light curer group-11 teeth and the laser group, 10.The color evaluation was carried out by the spectrophotometer and VITA 3D scale. After statistic analysis, it can be concluded that the whitening was verified by both methods.The temperature variation was significantly higher in the light cure group than in the laser group.

    Palavras-Chave: dentin; teeth; hydrogen peroxide; semiconductor diodes; bleaching

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  • IPEN-DOC 01717

    FREITAS, A.Z. ; ZEZELL, D.M. ; RIBEIRO, A.C.; GOMES, A.S.L.; VIEIRA, N.D. . Imagin carious human dental tissue with three-dimensional optical coherence tomography. Brazilian Dental Journal, v. 15, Special issue, p. 79-79, 2004.

    Abstract: Optical Coherence Tomography (OCT) used in this study, is a new non invasive optical detection technique. The OCT system is based on a Michelson interferometer, that generates a crosssectional image of the teeth with resolution up to 2 microns. The buccal surface from the third molar teeth was used to induce caries like lesions. This surface was coated with an acid resistant nail varnish except a small window. The pH demineralizationremineralization cycling model was used to produce the lesions. This cycle was repeated for 9 days and remained in the remineralizing solution for 2 days. The OCT system was implemented by using an ultrashort pulse laser (Ti:Al2O3@830nm) with 50fs of pulse width and average power of 80mW. The laser beam was focused into the teeth providing a lateral resolution of 10 microns. Image was produced with a lateral and axial scans steps of 10 microns. After analyzing the surface by OCT it was possible to produce a tomogram of dentine-enamel junction and it was compared with the histological image. This OCT system accurately depicts dental tissue and it was able to detect early caries in its structure, providing a powerful contactless high resolution 3D images of lesions.

    Palavras-Chave: teeth; bone tissues; microstructure; caries; three-dimensional calculations; interferometry; optical properties; tomography

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  • IPEN-DOC 10464

    ZEZELL, D.M. ; BEVILACQUA, F.M.; MAGNANI, R.; ANA, P.A. ; EDUARDO, C.P.. Fluoride incorporation and acid resistance of dental enamel irradiated with Er:YAG: atomic absorption spectrometry and spectrophotometry. Brazilian Dental Journal, v. 15, Special issue, p. 131-131, 2004.

    Abstract: Er:YAG effects on dental enamel surface regarding the resistance to demineralization and the fluoride incorporation were evaluated. 80 samples were divided into 8 groups: G1) control - APF application; G2) conditioning with 37% phosphoric acid and APF application; G3) irradiation with 250 mJ/pulse, 7 Hz, 31,84 J/cm2 (contact) and APF application; G4) irradiation with 200 mJ/pulse, 7 Hz, 25,47 J/cm2 (contact) and APF application; G5) irradiation with 150 mJ/pulse, 7 Hz, 19,10 J/cm2 (contact) and APF application; G6) irradiation with 250 mJ/pulse, 7 Hz, 2,08 J/cm2 (non-contact) and APF application; G7) irradiation with 200 mJ/pulse, 7 Hz, 1,8 J/cm2 (non-contact) and APF application; G8) irradiation with 100 mJ/pulse, 7 Hz, 0,9 J/cm2 (noncontact) and APF application. All samples were immersed in 2,0 M acetic-acetate acid solution, pH 4,5 for 8 hours. The fluoride, calcium and phosphorous ions were analyzed, by atomic absorption spectrometry and spectrophotometry. Groups laser irradiated before topic APF application presented better results than the control. There was higher fluoride incorporation on G7 and G8. Calcium and phosphorous analysis reveled a decrease on the enamel demineralization on G2 and G3 groups. The Er:YAG laser on irradiation conditions of this work is a promissory alternative for the Preventive Dentistry.

    Palavras-Chave: dentistry; enamels; lasers; laser radiation; fluorides

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  • IPEN-DOC 28987

    ANA, P.A. ; ROCHA, R.M.M. ; BLAY, A. ; AUN, C.E.; LAGE-MARQUES, J.L. ; ZEZELL, D.M. . Estudo morfológico da superfície de canais radiculares irradiados com laser Er,Cr:YSGG. Brazilian Oral Research, v. 18, Supplement, p. 164-164, 2004.

    Abstract: O objetivo deste estudo foi avaliar a aparência de canais irradiados com laser de Er,Cr:YSGG após preparo do canal radicular. Selecionou-se nove dentes unirradiculares humanos, cujos canais receberam preparo endodôntico com limas tipo K, associado ao Endo PTC e solução de Dakin. As amostras foram irrigadas com solução desmineralizante EDTA-T por 5 minutos e divididas em 4 grupos. As amostras do grupo I não foram irradiadas, enquanto as do grupo II, III e IV foram irradiadas em associação com a solução irrigadora, utilizando as seguintes fluências: GII (12,5 mJ/pulso; 2,8 J/cm²), GIII (25 mJ/pulso; 8,5 J/cm²) e GIV (75 mJ/pulso; 16,98 J/cm²). A irradiação laser foi realizada com frequência de 20 Hz e ausência de spray ar-água. As superfícies irradiadas foram, então, observadas em microscopia eletrônica de varredura (MEV). Observou-se que as áreas irradiadas apresentaram discreta ablação que aumentava com o aumento da fluência do laser. Não foram encontradas diferenças significativas nos terços coronais das amostras irradiadas ou não irradiadas correspondentes ao padrão de superfície e presença de “smear layer”. No terço médio, as amostras irradiadas apresentaram túbulos abertos e menor quantidade de “smear layer”; no terço apical, as amostras irradiadas exibiram túbulos parcialmente abertos e fina camada de magma dentinário. Conclui-se que a irradiação de canais radiculares com laser Er,Cr:YSGG remove a “smear layer” e propicia a abertura dos túbulos dentinários, o que pode melhorar a permeabilidade dos canais radiculares e por sua vez a ação de protocolos terapêuticos.

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  • IPEN-DOC 14214

    NAKASONE, R.K.; RODRIGUES, C.R.M.D.; BUZALAF, M.A.R.; OLYMPO, K.P.K.; TANJI, E.Y.; RIBEIRO, M.S. . Effects of the low-intensity red laser radiation on the fluoride uptake in human enamel: a preliminary study. Brazilian Dental Journal, v. 15, Special issue, p. 119-120, 2004.

    Abstract: Fluoride has been the most important preventive method on development of the caries. This in vivo study evaluated the effects of lowintensity red laser radiation on the fluoride uptake in enamel. Ten healthy participants were recruited for this study. The two upper central incisors of each volunteer were used and divided into 4 groups: group GC (control), which was untreated; group GF (fluoride), which received topical acidulated phosphate fluoride (APF) 1,23% treatment for 4 minutes; group GLF (laser + fluoride), which was irradiated with a low-intensity diode laser (l= 660 nm and dose= 6 J/cm²) with APF application after irradiation and group GFL (fluoride + laser), which received APF before irradiation using the same parameters as GLF. The determination of fluoride was performed using a fluoride ion electrode after an acid-etch enamel biopsy. The results showed a significant increase of the fluoride uptake in enamel for groups GF, GLF and GFL when compared to control group. Although a percentage increase of 57% was observed for GLF with respect to GF, there were no statistical differences among the treated groups. These findings motivate further studies in order to introduce low-power laser associated to APF as a protective method of dental caries.

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  • IPEN-DOC 09172

    HAYPEK, P.; THEODORO, L.H.; BACHMANN, L. ; EDUARDO, C.P.; SAMPAIO, J.E.C.; ZEZELL, D.M. . Effects of the diode laser irradiation on root surfaces: thermal analysis. Brazilian Dental Journal, v. 15, Special issue, p. 110-110, 2004.

    Abstract: The purpose of this study was to evaluate the temperature rising inside the pulpar cavity during the diode laser irradiation on the root surface. Twelve single root teeth were used and their mesial and distal surfaces were irradiated (808 nm, 400 m, 30 s), in a continuous mode (CW) and in an switched mode (SW) (10 Hz). The temperature rise was evaluated deppending with the power used (0.4 W to 2.2 W). The temperature was monitorated with a termopar (T) fixed inside de pulpar cavity during the irradiation. In a second step two parameters was used in a SW (10 Hz). The safety temperature was keep using the power: Group A - 0.9 W (mesial ) and Group B - 1.08 W (distal). The results showed the termal pulpar events (T) during the irradiation, based in an specific relation with the power (P), like T= -0.4+3.7P in a CW and T= -0.2+2P in a SW. The temperature rising during the irradiation was 3.4±0.4ºC on Group A and 4.0±1.0ºC on Group B. The irradiation mode and the power are much important to temperature rise inside the pulpar cavity and the 0.9 W and 1.08 W radiation on the root surfaces were safety.

    Palavras-Chave: semiconductor diodes; laser radiation; dentin; temperature dependence; teeth

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  • IPEN-DOC 12992

    GODOY, B.M.; ARANA-CHAVEZ, V.E.; BORTOLI GROTH, E.B.; RIBEIRO, M.S. . Effects of low-intensity red laser radiation on the dentine-pulp interface after class I cavity preparation disfunction. Brazilian Dental Journal, v. 15, Special issue, p. 86-87, 2004.

    Abstract: The aim of this study was to investigate the effects of low-intensity red laser radiation on the ultrastructure of dentine-pulp interface after conventionally prepared class I cavity preparation. Eight premolars indicated for extraction for orthodontic reasons from 2 patients were used. Class I cavities were prepared and the teeth were divided into two groups. The first group received a treatment with a GaAlAs laser, l= 660 nm, P= 30 mW and D= 2J/cm2. The laser tip was applied directly and perpendicularly into the cavity in only one sense. The teeth from the second group had their class I cavities prepared but they did not receive the laser therapy. All cavities were filled with composite resin. Twenty-eight days after the preparation, the teeth were extracted and processed for transmission electron microscopy analysis. Two sound teeth (healthy group) without any preparation were also examined. The first group presented odontoblastic processes in intimate contact with the extracellular matrix, while the collagen fibers appeared more aggregated and organized than those of the second group. These results were also observed in the healthy teeth. The results suggest that laser irradiation accelerates the recovery of the structures at the dentine-pulp interface involved during cavity preparation layer.

    Palavras-Chave: teeth; dentin; oral cavity; lasers; radiation effects

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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.