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Search Results: 1 - 10 of 77840 matches for " Costa Nilza Pereira da "
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Measurement of the optical density of packable composites: comparison between direct and indirect digital systems
Graziottin, Luiz Felipe Rodrigues;Costa, Nilza Pereira da;Silveira, Ivori Dutra da;Veeck, Elaine Bauer;
Pesquisa Odontológica Brasileira , 2002, DOI: 10.1590/S1517-74912002000400004
Abstract: the aim of this study was to measure the optical density of four packable composite resins with widths of 1, 2, 3 and 4 mm, by means of digora? (direct) and dentscan dentview? (indirect) digital imaging systems, in order to compare both methods. twenty acrylic plates, with the proposed thicknesses, were used, each one containing a sample of each resin. each acrylic plate was radiographed three times, under a standardized technique. for the digora? system, an optical plate was used under each resin sample, and, for the dentscan dentview? system, occlusal films were employed, totalizing 60 exposures for each system. optical plates and films were scanned and three consecutive optical readouts were carried out, totalizing 1,440 readouts. the results were submitted to statistical analysis and revealed that the average optical density of the four resins always increased as thickness increased. regarding the comparisons between the composite resins, in both analysis the resin with the greater optical density was surefil? followed by prodigy? condensable, alert? and solitaire?. the correlations between the results of digora? and dentscan dentview? were significant for the different thicknesses and materials. the observed tendency is that as the values obtained with the digora? system increase, so do the values obtained with dentscan dentview?. while thickness increased, the values of optical density in both digora? and dentscan dentview? tended to approach each other. the digora? system presented smaller amplitude between the results obtained in adjacent thicknesses.
Measurement of the optical density of packable composites: comparison between direct and indirect digital systems
Graziottin Luiz Felipe Rodrigues,Costa Nilza Pereira da,Silveira Ivori Dutra da,Veeck Elaine Bauer
Pesquisa Odontológica Brasileira , 2002,
Abstract: The aim of this study was to measure the optical density of four packable composite resins with widths of 1, 2, 3 and 4 mm, by means of Digora (direct) and DentScan DentView (indirect) digital imaging systems, in order to compare both methods. Twenty acrylic plates, with the proposed thicknesses, were used, each one containing a sample of each resin. Each acrylic plate was radiographed three times, under a standardized technique. For the Digora system, an optical plate was used under each resin sample, and, for the DentScan DentView system, occlusal films were employed, totalizing 60 exposures for each system. Optical plates and films were scanned and three consecutive optical readouts were carried out, totalizing 1,440 readouts. The results were submitted to statistical analysis and revealed that the average optical density of the four resins always increased as thickness increased. Regarding the comparisons between the composite resins, in both analysis the resin with the greater optical density was SurefilTM followed by ProdigyTM Condensable, AlertTM and Solitaire . The correlations between the results of Digora and DentScan DentView were significant for the different thicknesses and materials. The observed tendency is that as the values obtained with the Digora system increase, so do the values obtained with DentScan DentView . While thickness increased, the values of optical density in both Digora and DentScan DentView tended to approach each other. The Digora system presented smaller amplitude between the results obtained in adjacent thicknesses.
Cuidar em Enfermagem: como desenvolver a(s) competência(s)
Serrano,Maria Teresa Pereira; Costa,Arminda da Silva Mendes Carneiro da; Costa,Nilza Maria Vilhena Nunes da;
Revista de Enfermagem Referência , 2011,
Abstract: nursing is related to competence, professional practice and context. technological innovation and changes in work organization are leading to new business logic. nurses are key players in the process of change and the contexts are important in skills development. in terms of the processes of change, the intention was to investigate how nurses develop the skills of nursing care and what are the determinants of this process. the qualitative and ethnomethodological study focused on the presence of the researcher in the context. for data collection we used participant observation, semi-structured ethnographic interviews with nurses and other key informants and document analysis. conclusions: competency development is the result of interactions between the actors (health team), the context and knowledge across dyads. they develop in micro-and meso-systems influenced by exo-and macro systems. it is based on: strategies to promote a process of reflection on nursing practice, the construction of the experience, a habitus of care characterized by collective knowledge and a process of clinical supervision.
Cuidar em Enfermagem: como desenvolver a(s) competência(s) Atención en Enfermería: cómo desarrollar esa(s) competencia(s) Nursing care: how to develop the competence(ies)
Maria Teresa Pereira Serrano,Arminda da Silva Mendes Carneiro da Costa,Nilza Maria Vilhena Nunes da Costa
Revista de Enfermagem Referência , 2011,
Abstract: A enfermagem relaciona competência, exercício profissional e contexto. A inova o tecnológica e as altera es na organiza o do trabalho fazem emergir as novas lógicas empresariais. Os enfermeiros s o actores do processo de mudan a e os contextos s o um imperativo ao desenvolvimento de competências. Considerando os processos de mudan a pretendeu-se estudar o modo como os enfermeiros desenvolvem as competências do cuidar em enfermagem e quais as determinantes desse processo. O estudo qualitativo e etnometodológico privilegiou a presen a do investigador no contexto. Na colheita de dados utilizámos a observa o participante, entrevistas etnográficas e semi-estruturadas a enfermeiros e outros informantes privilegiados, além de análise documental. Conclus es: o desenvolvimento de competências resulta da articula o entre os actores (equipa de saúde), o contexto e os saberes através das díades. Estas desenvolvem-se nos sistemas micro e meso com influência do sistema exo e macro. Tem por base: estratégias promotoras de um processo reflexivo sobre a prática de enfermagem; a constru o da experiência, um habitus de cuidar caracterizado pelo conhecimento colectivo e um processo de supervis o clínica. La enfermería relaciona competencia, ejercicio profesional y contexto. La innovación tecnológica y las alteraciones en la organización del trabajo han hecho emerger nuevas lógicas empresariales. Los enfermeros son actores del proceso de cambio y los contextos son un imperativo en el desarrollo de competencias. Considerando los procesos de cambio se pretendió estudiar el modo cómo los enfermeros desarrollan competencias de la atención en enfermería y cuáles son las determinantes de ese proceso. El estudio cualitativo y etno-metodológico privilegió la presencia del investigador en el contexto. En la recolección de datos utilizamos la observación-participante, entrevistas etnográficas y semi-estructuradas a enfermeros y otros informantes privilegiados, además del análisis documental. Conclusiones: el desarrollo de competencias resulta de la articulación entre los actores (equipo de salud), el contexto y los saberes adquiridos día tras día. Estas se desarrollan en los sistemas micro - e incluso - con influencia del sistema exo y macro. Tienen por base: estrategias promotoras de un proceso reflexivo sobre la práctica de enfermería; la construcción de la experiencia, un habitus de cuidar caracterizado por el conocimiento colectivo y un proceso de supervisión clínica. Nursing is related to competence, professional practice and context. Technological innovation and changes in
Preload and torque removal evaluation of three different abutment screws for single standing implant restorations
Stüker, Rafael Augusto;Teixeira, Eduardo Rolim;Beck, Jo?o Carlos Pinheiro;Costa, Nilza Pereira da;
Journal of Applied Oral Science , 2008, DOI: 10.1590/S1678-77572008000100011
Abstract: several authors still consider the mechanical problems of fracture and component loosening as the main causes of failure of implant-supported restorations. the purpose of this in vitro study was to compare the preload of three types of screw for transmucosal abutment attachment used in single implant-supported prosthesis through strain gauge and removal torque measurements. three external hex fixtures were used, and each received a transmucosal abutment (cera one?), which was fixed to the implant with its respective screw: group a- gold screw, group b- titanium screw and group c- surface-treated titanium screw (ti-tite?). ten screws of each type were attached applying a 30.07±0.28 ncm torque force and maintained in position for 5 minutes. after this, the preload values were measured using strain gauges and a measurement cell. gold screws presented higher preload values (131.72±8.98 n), followed by surface-treated titanium screws (97.78±4.68 n) and titanium screws (37.03±5.69 n). anova (p<0.05) and tukey's test (p<0.05) were applied. statistically significant differences were found among the groups for both preload and removal torque values. in conclusion, gold screws may be indicated to achieve superior longevity of the abutment-implant connection and, consequently, prosthetic restoration due to greater preload values yielded.
Influence of soft tissues on mandibular gray scale levels
Souza, Paulo Henrique Couto;Costa, Nilza Pereira da;Veeck, Elaine Bauer;
Brazilian Oral Research , 2004, DOI: 10.1590/S1806-83242004000100008
Abstract: the purpose of this study was to analyze the gray levels, expressed in pixels, of the mandibular retromolar region, with regard to the influence of muscular and fat soft tissues near this region. fifteen dry mandibles were x-rayed with the presence of soft tissue simulators. the radiographs were digitized and evaluated by digora? software. a one cm thick layer of wax was used as a simulator of the muscular soft tissue. animal fat samples of different thicknesses - 0.5, 1.0, 1.5 and 2.0 cm - were used as a simulator of the fat soft tissue. results showed that the fat soft tissue simulator influenced the gray level values in pixels of the mandibular retromolar region when analyzed in different thicknesses using the digora? digitized image software.
Accuracy of periapical radiography, panoramic radiography and computed tomography for examining the mental foramen region
Bahlis, Alexandre;Mezzomo, Luis André;Boeckel, Daniel;Costa, Nilza Pereira da;Teixeira, Eduardo Rolim;
Revista Odonto Ciência , 2010, DOI: 10.1590/S1980-65232010000300012
Abstract: purpose: to determine the accuracy of different radiographic methods for bone height estimation at the mental foramen area. methods: twenty dry human hemimandibles were examed by using periapical and panoramic radiography, and computed tomography. an electronic digital caliper was used to measure the tracings obtained from the radiographies in three different times (groups a1, a2 and a3) and in the cross-sectioned hemimandibles (group b). measurements consisted of: measure 1 - from the upper limit of the alveolar ridge to the upper limit of the mental foramen; measure 2 - from the upper limit of the mental foramen to the inferior limit of the cortical bone of the base of the jaw; measure 3 - from the upper limit of the alveolar ridge to the inferior limit of the cortical bone of the base of the jaw. data were analyzed with student-t and friedman tests. results: the average difference values in measure 1 were 0.33 mm, 0.35 mm and 0.85 mm for the periapical radiography, computed tomography and panoramic radiography, respectively (confidence intervals of 0.17 mm to 0.49 mm, 0.18 mm to 0.53 mm and 0.38 mm to 1.32 mm, respectively). panoramic radiographies showed the greatest differences in measures 2 and 3, with average values of 1.05 mm and 1.93 mm, respectively. conclusion: periapical radiography and computed tomography showed the best accuracy. a safety margin for surgical purposes has been suggested.
Evaluation of mandibular implant sites: correlation between panoramic and linear tomography
Rockenbach, Maria Ivete Bolzan;Sampaio, Maria Carméli Correia;Costa, Lino Jo?o da;Costa, Nilza Pereira da;
Brazilian Dental Journal , 2003, DOI: 10.1590/S0103-64402003000300013
Abstract: the reliability of the linear tomography and panoramic radiography made with x-ray equipment was evaluated (vera view scope x-600; morita). the sample was composed of 20 dry human hemimandibles, in which the area selected for analysis was 1.5 cm distal from the limit set before the mental foramen. four measurements were made. the images obtained were drawn on acetate paper and the hemimandibles cut at the demarcated area. the measurements were made using a digital electronic pachymeter. the values found for the radiographic images were compared to those obtained in the mandibular specimens and submitted to statistical evaluation by the wilcoxon test. it was concluded that both techniques were reliable for the accomplishment of vertical linear measurements in the selected area. however, a 2.0 mm safety margin is recommended.
Evaluation of mandibular implant sites: correlation between panoramic and linear tomography
Rockenbach Maria Ivete Bolzan,Sampaio Maria Carméli Correia,Costa Lino Jo?o da,Costa Nilza Pereira da
Brazilian Dental Journal , 2003,
Abstract: The reliability of the linear tomography and panoramic radiography made with X-ray equipment was evaluated (Vera View Scope X-600; Morita). The sample was composed of 20 dry human hemimandibles, in which the area selected for analysis was 1.5 cm distal from the limit set before the mental foramen. Four measurements were made. The images obtained were drawn on acetate paper and the hemimandibles cut at the demarcated area. The measurements were made using a digital electronic pachymeter. The values found for the radiographic images were compared to those obtained in the mandibular specimens and submitted to statistical evaluation by the Wilcoxon test. It was concluded that both techniques were reliable for the accomplishment of vertical linear measurements in the selected area. However, a 2.0 mm safety margin is recommended.
Optical density and chemical composition of microfilled and microhybrid composite resins
Braun, Ana Paula;Grassi Soares, Clarissa;Glüer Carracho, Helena;Pereira da Costa, Nilza;Bauer Veeck, Elaine;
Journal of Applied Oral Science , 2008, DOI: 10.1590/S1678-77572008000200010
Abstract: this study evaluated the optical density of two microfilled and two microhybrid resins, as well as the composition of these materials with regard to their optical density. cavities prepared in 12 2-mm- or 4-mm-thick acrylic plastic plates were filled with z250 (3m-espe), a110 (3m-espe), charisma (heraeus-kulzer) and durafillvs (heraeus-kulzer). the resin increments (2-mm-thick) were light-cured for 40 s. three 0.12-s radiographic exposures were made of each #2 acrylic plastic plate. denoptix system optical plates were used to obtain the digital images. three readings of the composite resin surface were made in each radiograph, totalizing 216 readings. the mean of highest and lowest grey-scale values was obtained. two specimens of each composite resin were prepared for sem analysis of the chemical elements related to optical density, using energy dispersive x-ray analysis (edx). the results were subjected to shapiro-wilk's test, anova, tukey's test at 1% level of significance and pearson's correlation. the mean grey-scale values at 2 mm and 4 mm were: z250 = 154.27a and 185.33w; a110 = 46.77b and 63.05y; charisma = 163.40c and 200.46z; durafillvs = 43.92b and 58.99x, respectively. pearson's test did not show any positive correlation between optical density and percentage weight of optical density chemical elements. it was concluded that the microhybrid resins had higher optical density means than the microfilled resins; among the evaluated resins, charisma had the highest optical density means.
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