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Search Results: 1 - 7 of 7 matches for " Raldi "
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In vitro evaluation of the effects of the interaction between irrigating solutions, intracanal medication and Er:YAG laser in dentin permeability of the endodontic system
Raldi, Denise Pontes;Lage-Marques, José Luiz;
Pesquisa Odontológica Brasileira , 2003, DOI: 10.1590/S1517-74912003000300014
Abstract: the purpose of this study was to evaluate in vitro the effects of different associations between irrigating solutions (edta-t and citric acid), intracanal medicament (ndp), and er:yag laser irradiation on dentin permeability. fifty-one extracted single-rooted teeth were instrumented and divided into seven groups. groups gi and gii had final irrigation with a demineralizing solution only (edta-t and citric acid, respectively). groups giii and giv had final irrigation with edta-t and citric acid, respectively, plus an association of irrigating solution and er:yag laser. groups gv and gvi had final irrigation with edta-t and citric acid, respectively, plus an association of intracanal medication and er:yag laser. group gvii (control group) had final irrigation with distilled water. all root canals were filled with ndp associated with rhodamine b dye. after the experimental period, the samples were transversely cut into six 2.0 mm thick slices for subsequent reading using the imagelab software. analysis of the results allowed us to conclude that there were statistically significant differences (p < 0.05) between the groups as to the penetration of the dye-intracanal medication solution. groups iii and iv presented smaller values of dentinal permeability when compared to the other groups. the best results were obtained with the interaction between a demineralizing irrigating solution and the association of intracanal medicament and laser er:yag (groups v and vi). in these groups the observed penetration of the intracanal medicament plus dye solution in the apical third was, on average, 29% greater than in the other groups.
In vitro evaluation of the effects of the interaction between irrigating solutions, intracanal medication and Er:YAG laser in dentin permeability of the endodontic system
Raldi Denise Pontes,Lage-Marques José Luiz
Pesquisa Odontológica Brasileira , 2003,
Abstract: The purpose of this study was to evaluate in vitro the effects of different associations between irrigating solutions (EDTA-T and citric acid), intracanal medicament (NDP), and Er:YAG laser irradiation on dentin permeability. Fifty-one extracted single-rooted teeth were instrumented and divided into seven groups. Groups GI and GII had final irrigation with a demineralizing solution only (EDTA-T and citric acid, respectively). Groups GIII and GIV had final irrigation with EDTA-T and citric acid, respectively, plus an association of irrigating solution and Er:YAG laser. Groups GV and GVI had final irrigation with EDTA-T and citric acid, respectively, plus an association of intracanal medication and Er:YAG laser. Group GVII (control group) had final irrigation with distilled water. All root canals were filled with NDP associated with rhodamine B dye. After the experimental period, the samples were transversely cut into six 2.0 mm thick slices for subsequent reading using the ImageLab software. Analysis of the results allowed us to conclude that there were statistically significant differences (p < 0.05) between the groups as to the penetration of the dye-intracanal medication solution. Groups III and IV presented smaller values of dentinal permeability when compared to the other groups. The best results were obtained with the interaction between a demineralizing irrigating solution and the association of intracanal medicament and laser Er:YAG (groups V and VI). In these groups the observed penetration of the intracanal medicament plus dye solution in the apical third was, on average, 29% greater than in the other groups.
Treatment of ameloblastoma
Fernando Vagner Raldi,Rubens Guimar?es-Filho,Michelle Bianchi de Moraes,Ana Cristina Claro Neves
RGO : Revista Gaúcha de Odontologia , 2010,
Abstract: Ameloblastoma is a benign odontogenic tumor of epithelial origin, with slow growth, frequently found in the mandible or maxilla. The symptoms are unnoticeable, rarely being perceived by the patient in the initial stages, and are sometimes diagnosed by chance in routine radiographic exams. Clinically, it is a hardened curvature that grows slowly, and the regional mucosa remains with the normal appearance. There is rarely a solution of continuity or infection. The ameloblastoma invades the spaces between the trabeculated bones without reabsorbing them, and expands the compact bone without invading it, however, it may propagate through the mandibular canal. It has been given this name due to its similarity to the cells of the enamel organ and it has a unique biological behavior that leads to controversy with regard to the best form of treatment. This clinical case describes the case of a unicystic ameloblastoma located in the left retromandibular region with eight years of follow-up. Clinical and radiographic diagnosis was confirmed through the histopathologic exam. Treatment proposed was enucleation without marginal dissection.
Simulation of Impacts of Changing in the International Standard of Financial Instruments (IFRS 9) in the Major Brazilian Banks
Samir Sayed,ênio Bonafé Mendon?a de Souza,Jorge Andrade Costa,Gustavo Raldi Tancini
Revista Sociedade, Contabilidade e Gest?o , 2013,
Abstract: This article aimed to verify the impact of changes in the net profit and their respective volatilities resulting from changes of the international standard of financial instruments, from IAS 39 to IFRS 9, in regard to aspects: (i) the future change in the methodology of the impairment calculated e (ii) the elimination of the category "available for sale" and their reclassification to the category "fair value through profit or loss". The study was based on simulations in profits expected to sixteen quarters, from 31/12/2010 to 31/12/2014, to the five largest financial institutions in Brazil. For such simulations it were projected interest rates that fluctuate according to the estimated model of the term structure of interest rates using the Monte Carlo method. According to the projected interest rates set new credit risk levels, which resulted changes in the impairment and fair value of financial assets previously classified as available for sale. The results showed an early impact in Q1, in view of their adaptation to the new standard. Subsequently, there was no significant change in the results and their respective volatilities.
Effect of nitric oxide inhibitor and donor substances on the infammatory process caused by endodontic irrigants
Brito, Luciana Malheiro de;Carreira, Cláudia de Moura;Raldi, Denise Pontes;Lage-Marques, José Luiz;Habitante, Sandra Márcia;Saad, Wilson Abra?o;
Journal of Applied Oral Science , 2011, DOI: 10.1590/S1678-77572011000200006
Abstract: nitric oxide (no) has been considered a key molecule in infammation. objective: the aim of this study was to evaluate the effect of treatment with l-name and sodium nitroprussiate, substances that inhibit and release no, respectively, on tissue tolerance to endodontic irrigants. material and methods: the vital dye exudation method was used in a rat subcutaneous tissue model. injections of 2% evans blue were administered intravenously into the dorsal penial vein of 14 male rats (200-300 g). the no inhibitor and donor substances were injected into the subcutaneous tissue in the dorsal region, forming two groups of animals: g1 was inoculated with l-name and g2 with sodium nitroprussiate. both groups received injections of the test endodontic irrigants: acetic acid, 15% citric acid, 17% edta-t and saline (control). after 30 min, analysis of the extravasated dye was performed by light absorption spectrophotometry (620 nm). results: there was statistically signifcant difference (p<0.05) between groups 1 and 2 for all irrigants. l-name produced a less intense infammatory reaction and nitroprussiate intensifed this process. conclusions: independently of the administration of no inhibitors and donors, edta-t produced the highest irritating potential in vital tissue among the tested irrigating solutions.
Surface finishing of unused rotary endodontic instruments: a SEM study
Chianello, Giovani;Specian, Vivyane Leal;Hardt, Lilian Cristina Fucuda;Raldi, Denise Pontes;Lage-Marques, José Luiz;Habitante, Sandra Márcia;
Brazilian Dental Journal , 2008, DOI: 10.1590/S0103-64402008000200004
Abstract: during endodontic therapy, cleaning of root canals is performed using endodontic files and auxiliary chemical substances, and it is important that the endodontist be familiar with the instruments used in daily practice. this study evaluated, under scanning electron microscopy (sem), the quality of the surface finishing of unused rotary endodontic instruments. fifty sizes 20, 25 and 30 rotary files from different commercial brands (profile, protaper, race, hero and k3 endo) were removed directly from their packages and had their final 3 mm examined with a scanning electron microscope at x190 magnification with no previous preparation. the images were evaluated by 3 skillful, calibrated, blinded observers according to the following criteria: cutting edge, debris, grooves, microcavities, tip shape, tip position, scraping and transition angle. data were recorded in worksheets designed for the study. irregular edges were observed in 50-100% of the files. except for profile, all commercial brands presented surface debris in 100% of samples. only race files showed no grooves or microcavities. k3 endo files presented the best tip centralization. excetp for protaper files, all commercial brands presented blunt-cutting edges in 100% of samples. all types of files presented surface scraping. k3 endo files and protaper had a high percentage of transition angle. based on the evaluation criteria used in the present study, most samples presented a minimum of 2 alterations and a maximum of 7 alterations per instrument. under the tested conditions, the quality of the surface finishing of the examined instruments was not as expected, given that no instrument was free of imperfections and most of them presented at least 2 and up to 7 types of surface defects. these results suggest that the manufacturing process and the packaging conditions of rotary endodontic instruments are far from ideal.
Evaluation of a strategic practice demonstration method applied to endodontic laboratory classes
Oliveira, Adriana Pachêco de;Carvalho, Erica dos Santos;Lage-Marques, José Luiz;Cavalli, Vanessa;Habitante, Sandra Márcia;Raldi, Denise Pontes;
Revista Odonto Ciência , 2012, DOI: 10.1590/S1980-65232012000200006
Abstract: purpose: to evaluate a strategic method of real time visual demonstration of the operatory procedures using an intraoral camera system and monitor videos, comparing them to those of conventional laboratory classes. methods: fifty-two structured, multiple choice questionnaires were applied to undergraduate students of the 4th year (g1) and 3rd year (g2) submitted to the traditional and strategic teaching methods, respectively. these tests were also able to detect the main problems faced by the students during the training of this operatory phase. results: students of both groups (g1- 30.8% and g2- 34.6%) considered the access cavity to be one of the most difficult phase of endodontic treatment. the results of the evaluation among the 3rd year students demonstrated that 23.1% graded the new method as excellent, 38.4% as very good and 38.5 % as good, whereas none of the students (0%) considered the method to be regular, bad or very bad. a minor accident occurrence (p<0.05) was reported by the 3rd year students (g1- 50% and g2- 34.6%). conclusion: the new strategy was found to favor learning, reduce the incidence of errors and was appraised as efficient by the students.
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