Navegação por Autores IPEN "ZAMATARO, CLAUDIA B."

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  • IPEN-DOC 17665

    ZEZELL, DENISE M. ; EDUARDO, PATRICIA L. de P. ; STREFEZZA, CLAUDIA ; ZAMATARO, CLAUDIA B. ; CORREA, PAULO ; SALVADOR, VERA L.R. ; ROSSI, WAGNER de ; BACHMANN, LUCIANO. In vivo study of holmium laser irradiation on dental structure. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 34., 5-10 de junho, 2011, Foz do Iguaçu, PR. Resumos... 2011.

    Palavras-Chave: lasers; holmium; teeth; fluorides; scanning electron microscopy; x-ray fluorescence analysis; caries; preventive medicine

  • IPEN-DOC 18688

    PEREIRA, DAISA L. ; MORAES, MARCIA C.D. ; ZAMATARO, CLAUDIA B. ; ZEZELL, DENISE M. . Longevity of diode laser irradiation in dentine: an in vitro study. In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th, October 1-3, 2018, Aachen, Germany. Abstract... Aachen, Germany: International Society for Laser in Dentistry, 2018. p. 47-47.

    Abstract: The efficacy of pulsed infrared lasers on clinical dentin wear sensitivity is well stablished in the Literature. This work aims to evaluate the effect of diode laser combined with fluoride products regarding the longevity of the sensibility treatment under the effect of the domestic use products. After Ethics Committee approval, 75 slabs of bovine root dentin measuring 8 mm2, were randomized into 5 groups (n=1 5): G1- untreated; G2- treated with acidulated phosphate fluoride (APF-gel, [F-J=1.23 %, pH=3.3 to 3.9); G3- irradiated with diode laser (980 nm, 2.5W, 5ms, 25Hz) using a cool paste as photoabsorber; G4- irradiated with diode laser (same conditions of G3) using a coal paste as photoabsorber + application of APF-gel and G5- application of APF-gel+ diode laser irradiation (same conditions of G3). All samples were submitted to an erosive and abrasive demineralization (Sprite Zero, pH=2.8, 90s, 4x/day), and remineralization (artificial saliva, pH=7.4) cycling for 10 days. Twice a day, slabs were brushed for 15s using a whitening dentifrice (Sensodyne True White, GSK, EUA). Slabs were evaluated by Optical Coherence Tomography (OCT) at the initial and 7th day of cycling. OCT measurements found a significant increase on dentin wear depth and area of lesions with the increase of cycling days. G1 and G2 hod significant higher mineral loss compared to the other groups. G3, G4 and GS showed no significant differences between them. Results suggested that the sensibility of the treatment with the diode laser has longevity despite the high abrasivity of dentifrice used in maintenance.

  • IPEN-DOC 25603

    ZAMATARO, CLAUDIA B. ; SCAPIN, MARCOS ; KUCHAR, NIELSEN G. ; ZANINI, NATHALIA ; ZEZELL, DENISE M. . Molecular analysis of human and bovine hydroxyapatite from dental enamel and dentin submitted to gamma radiation. In: LATIN AMERICA OPTICS AND PHOTONICS CONFERENCE, November 12-15, 2018, Lima, Peru. Resumo expandido... Washington, DC, USA: OSA, 2018.

    Abstract: The important alteration of gamma irradiated hydroxyapatite in the buccal cavity depends on the biochemical alteration of the environment. The hydroxyapatite analyzed isolated showed a minimal molecular change of the crystal.

  • IPEN-DOC 25609

    ZAMATARO, CLAUDIA B. ; PEREIRA, DAISA L. ; GOMES, GABRIELA V. ; ALVES, NATHALIA Z. ; CASTRO, PEDRO A.A. ; DIAS, DERLY A. ; ZEZELL, DENISE M. ; SCAPIN, MARCOS A. . Molecular characterization of ex-vivo natural bovine dental enamel. In: ENCONTRO DE OUTONO, 41., 06-11 de maio, 2018, Foz do Iguaçu, PR. Resumo... São Paulo: Sociedade Brasileira de Física, 2018. p. 1-1.

    Abstract: Bovine teeth are widely used to infer results on a human population. Considering this, an analysis of the mineral content of bovine enamel, focusing the hidroxiapatite (HA), was carried out to evaluate the homogeneity of the sample universe for future experiments with laser irradiation as a substitute of human teeth enamel. Twelve samples of 5 x 5 mm bovine enamel were prepared and polished plane. The mineral content was calculated through surface microhardness (SMH) and morphology by scanning electron microscopy (SEM). Main molecular components of the enamel were analysed by Energy Dispersive X-ray Spectroscopy (EDS). Surface microhardness is an indirect indicator of the mineral content of the samples, which was 258.2 (38.8) KHN. The compounds present in the samples, the values of Calcium and Phosphate oxides and the ration Ca/P were analizes. As expected Phosphorus pentoxide and Calcium oxide were the main constituent of the samples (57.4 to 59.9%). The CaO/P2O5 ratio shows a variation with linear correlation (R2 = 1). The elemental ratio (Ca/P) shows a change in the elemental content with linear correlation (R2 = 1). 30% of the samples presented Strontium oxide, 30% had Zirconium dioxide, 10% had Magnesium oxide and 40% had Silicon dioxide. All samples showed Sulfur trioxide, Iron trioxide and Chlorine. 10% did not shown Zinc oxide. 5% had Potassium oxide and Nickel oxide in its composition. The surface microhardness results, although only for the initial homogenization of the sample universe, showed a Knoop hardness number within a spectrum similar to that of natural hydroxyapatite of human origin. The EDS results show that bovine enamel hydroxyapatite present great similarity with that from human enamel hydroxyapatite from the point of view of chemical composition. These results corroborate the use of bovine hydroxyapatite in substitution of hydroxyapatite of human origin. Despite the inter-species similarity, it is possible to note that in the same species the composition of hydroxyapatite varies. In the bovine species, the feeding, the period of formation of the dental germs and the origin are more standardized and controlled than in humans. Nevertheless, it is possible to notice a variation of the components elements of bovine dental enamel, and it is necessary to restrict an interval of hardness and Ca/P values to homogenise the samples properties for use in any experiment.

  • IPEN-DOC 27710

    ZANINI, NATHALIA A. ; RABELO, THAIS F. ; ZAMATARO, CLAUDIA B. ; CARAMEL-JUVINO, AMANDA ; ANA, PATRICIA A.; ZEZELL, DENISE M. . Morphological, optical, and elemental analysis of dental enamel after debonding laminate veneer with Er,Cr:YSGG laser: a pilot study. Microscopy Research and Technique, v. 84, n. 3, p. 489-498, 2021. DOI: 10.1002/jemt.23605

    Abstract: Laminate veneer removal is becoming a routine procedure at the dental clinic and the use of laser can facilitate its removal. This work aimed to evaluate the morphological, elemental, and optical changes in the remaining enamel after veneer removal using Er,Cr:YSGG laser. Forty‐four enamel slabs were prepared and randomly distributed into nine experimental groups, for bonding using lithium disilicate laminates with three different luting agents (Variolink Veneer, RelyX U200, and RelyX Veneer). Then each agent was debonded using Er,Cr:YSGG laser (2.78 μm) using two different protocols:3.5 W, 48.14 J/cm2, 20 Hz non‐contact and 3.0 W, 48.14 J/cm2, 20 Hz non‐contact. The morphological, optical, and elemental analysis of enamel was performed before cementation and after laser debonding, using scanning electron microscopy (SEM), optical coherence tomography (OCT), and energy‐dispersive X‐ray spectroscopy (EDS). The level of statistical significance adopted was 5%. The EDS analysis of enamel after debonding revealed a significant increase in silane and carbon, as well as a decrease in calcium and phosphate contents. Analysis showed the presence of residual cement in most experimental groups but the morphological analysis showed alteration of the enamel's prisms only in the groups that used RelyX Veneer and Variolink Veneer cements. There was no evidence of deleterious morphological changes resulting from irradiation. However, an increase in the optical attenuation coefficient by the OCT was observed due to the presence of the remaining cement. It can be concluded that the Er,Cr:YSGG laser, in the mean powers used, is efficient for veneer removal without causing deleterious effects for the enamel.

    Palavras-Chave: dentistry; enamels; lasers; laser radiation; lithium; tomography; optical properties; coherent radiation; teeth

  • IPEN-DOC 18341

    PEREIRA, DAISA L. ; GOMES, GABRIELA V. ; SUGAHARA, VANESSA M.L.; SCAPIN, MARCOS A. ; ANA, PATRICIA A. ; ARANHA, ANA C.C.; ZAMATARO, CLAUDIA B. ; ZEZELL, DENISE M. . Nd:YAG laser irradiation of darkened dental enamel by means of dentrifice use. In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th, October 1-3, 2018, Aachen, Germany. Abstract... Aachen, Germany: International Society for Laser in Dentistry, 2018. p. 87-87.

    Abstract: As the world population is growing older, dental erosion became a real concern on dentistry. Optical Coherence Tomography and X-Ray fluorescence were used to analyze enamel samples covered by black dentifrice as photoabsorber irradiated with NdYAG laser, then submitted to an erosive cycling. Heat injury risk in deeper tissue decreases because of the dentifrice dark pigment, when the most of photons are absorbed in the surface. Sixty Bmm2 blocks of bovine enamel, were randomized into 4 groups: G1- untreated; G2- treated with acidulated phosphate fluoride (APF, [FJ::1.23%, pH::3.3 to 3.9); G3- irradiated with Nd:YAG laser (1064nm, 0.6W, 10Hz- Lares Research®) using a coal paste as photoabsorber; G4- irradiated with Nd:YAG laser (1064nm, 0.6W, 10Hz), using a black dentifrice (Black is White, Curaprox®). All samples were submitted to a 3-day erosive demineralization (Citric acid 1%, pH::3.6, 5min, 2x/day) under agitation, and remineralization cycling (artificial saliva, pH::7, 120minJ. After treatments and pH cycling, the [Ca]/[P] ratio decreased in the laser irradiated groups. The samples were evaluated by OCT before and after treatment and after erosive cycling. OCT measurements found smaller lesion depths in laser irradiated groups than in the other groups and there were statistically significant differences between G3 and G4 groups (p<0.05). Heating promoted by Nd:YAG laser irradiation changed the morphological and crystallographic enamel surface properties and has shown to be a promissory alternative to prevent erosion.

  • IPEN-DOC 20860

    QUINTO JUNIOR, JOSE ; ZAMATARO, CLAUDIA B. ; BENETTI, CAROLINA ; DIAS, DERLY A. ; BLAY, ALBERTO ; ZEZELL, DENISE M. . Optical properties of human radicular dentin: ATR-FTIR characterization and dentine tubule direction influence on radicular post adhesion. In: KURACHI, CRISTINA (Ed.); SVANBERG, KATARINA (Ed.); TROMBERG, BRUCE J. (Ed.); BAGNATO, VANDERLEI S. (Ed.) BIOPHOTONICS SOUTH AMERICA, May 23, 2015, Rio de Janeiro, RJ. Proceedings... Society of Photho-optical Instrumentation Engineers, 2015. p. 95311V-1 - 95311V-8. (SPIE Proceedings Series, 9531).

    Palavras-Chave: teeth; dentin; optical properties; laser radiation; adhesion; fourier transform spectrometers; reflection

  • IPEN-DOC 27992

    RABELO, THAIS F. ; ZAMATARO, CLAUDIA B. ; ZANINI, NATHALIA ; JUVINO, AMANDA C. ; KUCHAR, NIELSEN G. ; CASTRO, PEDRO A.A. ; ZEZELL, DENISE M. . Removal of laminates with Er,Cr:YSGG laser from dental enamel submitted to gamma radiation. Photobiomodulation, Photomedicine, and Laser Surgery, v. 37, n. 10, p. A21-A21, 2019. DOI: 10.1089/photob.2019.29013.abstracts

    Abstract: Background: Modern Dentistry is characterized by the search for aesthetic perfection in the smile. Many efforts are made regarding procedures related to manufacturing, cementing, maintenance and removal of ceramic laminates. The laser removal of laminates has become more frequent when the aesthetical procedures needs to be replaced. On the other hand, the head and neck cancer treatment causes comorbidities in the buccal environment when laminates are in place. Objective: To evaluate in vitro the removal of ceramic fragments by means of Er,Cr:YSGG laser irradiation, after gamma radiation. Methods: 20 Lithium disilicate veneers were cemented with Variolink to human dental enamel and then samples were irradiated with 0.07 kGy. After gamma irradiation, the laminates removal with Er,Cr:YSGG laser was performed. The control group was not subjected to gamma radiation. Dental enamel samples were analyzed by Scanning Electron Microscopy (SEM), Fourier Transformed Infrared Spectroscopy (FTIR) and Surface Microhardness Loss (SMH). Results: SEM has shown that less cement was found after removal of the facets in gamma irradiated group when compared to the control. For both groups there was alteration of the SMH possibly due to the use of the adhesive system. When performed intra group analysis, the sample being its own control of baseline in the FTIR analysis, there were no band shifts or formation of new compounds on the surface of human dental enamel. Conclusions: The Er,Cr:YSGG laser is an effective alternative for laminates removal in human dental enamel even when it is subjected to gamma radiation.

  • IPEN-DOC 28438

    SCAPIN, MARCOS A. ; MOREIRA JUNIOR, CLAUDIO; ZAMATARO, CLAUDIA B. ; GONCALVES, SERGIO E. de P.; ZEZELL, DENISE M. . SEM/EDS for determining the phosphorus and calcium content in human dentin submitted to radiotherapy for head and neck cancer. In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 43., 23-26 de novembro, 2020, Online. Resumo... São Paulo, SP: Sociedade Brasileira de Física, 2020.

    Abstract: The research followed the CONSORT 2010 guidelines. Patients who underwent radiotherapy due to the head and neck cancer (n = 12) and healthy patients (n = 12) donated the teeth. Twenty-four urgently extracted teeth for periodontal reasons or in order to prevent infectious processes were used. All teeth obtained had the approval from the ICT - UNESP Human Experiments Ethics Committee. The teeth obtained were separated into two large groups: Control (n = 12 dentin teeth of healthy patients) and Irradiated (n = 12 dentin teeth of patients irradiated in vivo) and sectioned in their long axes, obtaining two halves (n = 24 per group). The samples were analyzed by Scanning Electron Microscopy with Energy Dispersive (SEM/EDS) and Surface Microhardness (SMH). The results obtained by SEM/EDS and X-Ray Fluorescence techniques were analyzed separately and then compared to each other. To validate the analytical method of the correlation between the two types of tests performed, the Horwitz equation was used, which would generate a Horwitz value and establishes for either method. Precision for repeatability was assessed using the relative percentage standard deviation (RDS%) and the acceptability criterion by the Horwitz test. Accuracy was assessed by relative percentage error (ER%) and acceptance criterion by z-score. The precision for repeatability was evaluated through the relative standard deviation (RSD%) and the acceptability was verified using the equation of Horwitz, in which the HORRAT’s (HOR) values fit more accordingly.

  • IPEN-DOC 24703

    AMARAL, MARCELLO M.; RAELE, MARCUS P. ; ANA, PATRICIA A.; NUNEZ, SILVIA C.; ZAMATARO, CLAUDIA B. ; ZEZELL, DENISE M. . Wavelength comparison for laser induced breakdown spectroscopy caries detection. In: RECHMANN, PETER (Ed.); FRIED, DANIEL (Ed.) LASERS IN DENTISTRY, 24th, January 27 - February 01, 2018, San Francisco, California, USA. Proceedings... Bellingham, WA, USA: Society of Photo-optical Instrumentation Engineers, 2018. p. 104730K-1 - 104730K-6. (SPIE Proceedings Series, 10473). DOI: 10.1117/12.2288373

    Abstract: Laser Induced Breakdown Spectroscopy (LIBS) is a technique capable to perform elemental analyses of a variety of samples, independent of matter state. Other spectroscopy techniques may require a destructive and time-consuming sample preparation. On the other hand, LIBS is a less destructive technique with no (or considerably less) sample preparation, using a relatively simple experimental setup. LIBS also provides a multielement analysis into one single spectrum acquisition, applying a Nd:YAG short-pulsed laser to ensure the stoichiometry between the sample and the generated plasma. LIBS have been applied on the study of carious lesions using a Nd:YAG into its fundamental emission at 1064 nm. It was shown that ratio of P/Ca and Zn/Ca can be used to monitor the cariogenic process. Another minor elements, e.g. C and Cu, associated with bacteria biofilm were also measured with the Nd:YAG laser. The fundamental wavelength emission (1064 nm) of Nd:YAG is coincident with a hydroxyapatite transmission window and it may affect the result. In order to address this issue a study used the second harmonic of the Nd:YAG laser at 532 nm. It was show that it is also possible perform LIBS on carious lesion using the Nd:YAG at 532 nm. However, there is not a work direct comparing the LIBS at 532 nm and 1064 nm for carious lesion detection. So, the aim of this work was to investigate the influence of laser wavelength on the LIBS performance for carious lesion detection. In both cases the carious lesion was detected with the advantage of no interference with hydroxyapatite at 532 nm.

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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.