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[PMID]:29412222
[Au] Autor:Ayse Gozde T; Metin S; Mubin U
[Ad] Endereço:Ege University, Faculty of Dentistry, Department of Prosthodontics, Izmir, Turkey.
[Ti] Título:Evaluation of adaptation of ceramic inlays using optical coherence tomography and replica technique.
[So] Source:Braz Oral Res;32:e005, 2018 Feb 01.
[Is] ISSN:1807-3107
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:Optical coherence tomography (OCT) has generally been used as a nondestructive technique to evaluate integrities of composite restorations. We investigated marginal and internal adaptations of ceramic inlay restorations with OCT and compared them to results with the silicone replica technique. Round-shaped class I cavities were prepared on 16 human maxillary first premolar teeth. Ceramic inlays were fabricated. Silicone replicas from inlays were obtained and sectioned to measure marginal and internal adaptations with a stereomicroscope (Leica Dfc 295, Bensheim, Germany). Inlays were cemented on respective teeth. Marginal and internal adaptations were then measured with the OCT system (Thorlabs, New Jersey, USA) in 200- µm intervals. Replica and OCT measurements were compared with independent samples t-tests. A paired t-test was used to evaluate the marginal and internal adaptations of each group (p < 0.05). Marginal and internal adaptations were 100.97 ± 31.36 and 113.94 ± 39.75 µm, respectively, using the replica technique and 28.97 ± 17.86 and 97.87 ± 21.83 µm, respectively, using OCT. The differences between the techniques were significant (p = 0.00 and p = 0.01, respectively). On evaluation within the groups, internal adaptation values were found to be significantly higher than the marginal adaptation values for the replica technique (p = 0.00) and OCT (p = 0.00). Therefore, the replica and OCT techniques showed different results, with higher values of marginal and internal adaptation found with the replica technique. Marginal and internal adaptation values of ceramic inlays, whether measured by replica or OCT techniques, were within clinically acceptable limits.
[Mh] Termos MeSH primário: Cerâmica/química
Adaptação Marginal Dentária
Restaurações Intracoronárias/métodos
Técnicas de Réplica/métodos
Tomografia de Coerência Óptica/métodos
[Mh] Termos MeSH secundário: Seres Humanos
Teste de Materiais
Padrões de Referência
Valores de Referência
Reprodutibilidade dos Testes
Cimentos de Resina/química
Propriedades de Superfície
[Pt] Tipo de publicação:COMPARATIVE STUDY; EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Resin Cements)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180307
[Lr] Data última revisão:
180307
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:180208
[St] Status:MEDLINE


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[PMID]:28550174
[Au] Autor:Chen J; Ceholski DK; Liang L; Fish K; Hajjar RJ
[Ad] Endereço:Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, New York.
[Ti] Título:Variability in coronary artery anatomy affects consistency of cardiac damage after myocardial infarction in mice.
[So] Source:Am J Physiol Heart Circ Physiol;313(2):H275-H282, 2017 Aug 01.
[Is] ISSN:1522-1539
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Low reliability and reproducibility in heart failure models are well established. The purpose of the present study is to explore factors that affect model consistency of myocardial infarction (MI) in mice. MI was induced by left coronary artery (LCA) ligation. The coronary artery was casted with resin and visualized with fluorescent imaging ex vivo. LCA characteristics and MI size were analyzed individually in each animal, and MI size was correlated with left ventricular (LV) function by echocardiography. Coronary anatomy varies widely in mice, posing challenges for surgical ligation and resulting in inconsistent MI size postligation. The length of coronary arterial trunk, level of bifurcation, number of branches, and territory supplied by these branches are unique in each animal. When the main LCA trunk is ligated, this results in a large MI, but when a single branch is ligated, MI size is variable due to differing levels of LCA ligation and area supplied by the branches. During the ligation procedure, nearly 40% of LCAs are not grossly visible to the surgeon. In these situations, the surgeon blindly sutures a wider and deeper area of tissue in an attempt to catch the LCA. Paradoxically, these situations have greater odds of resulting in smaller MIs. In conclusion, variation in MI size and LV function after LCA ligation in mice is difficult to avoid. Anatomic diversity of the LCA in mice leads to inconsistency in MI size and functional parameters, and this is independent of potential technical modifications made by the operator. In the present study, we demonstrate that left coronary artery diversity in mice is one of the primary causes of variable myocardial infarction size and cardiac functional parameters in the left coronary artery ligation model. Recognition of anatomic diversity is essential to improve reliability and reproducibility in heart failure research.
[Mh] Termos MeSH primário: Anomalias dos Vasos Coronários/complicações
Vasos Coronários/patologia
Infarto do Miocárdio/patologia
Miocárdio/patologia
[Mh] Termos MeSH secundário: Animais
Anomalias dos Vasos Coronários/patologia
Anomalias dos Vasos Coronários/fisiopatologia
Vasos Coronários/fisiopatologia
Vasos Coronários/cirurgia
Modelos Animais de Doenças
Ligadura
Masculino
Camundongos Endogâmicos C57BL
Infarto do Miocárdio/etiologia
Infarto do Miocárdio/fisiopatologia
Imagem Óptica
Fenótipo
Técnicas de Réplica
Volume Sistólico
Função Ventricular Esquerda
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170907
[Lr] Data última revisão:
170907
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170528
[St] Status:MEDLINE
[do] DOI:10.1152/ajpheart.00127.2017


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[PMID]:28424208
[Au] Autor:Marsh DJ; Postnov DD; Rowland DJ; Wexler AS; Sosnovtseva OV; Holstein-Rathlou NH
[Ad] Endereço:Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, Rhode Island; donald_marsh@brown.edu.
[Ti] Título:Architecture of the rat nephron-arterial network: analysis with micro-computed tomography.
[So] Source:Am J Physiol Renal Physiol;313(2):F351-F360, 2017 Aug 01.
[Is] ISSN:1522-1466
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Among solid organs, the kidney's vascular network stands out, because each nephron has two distinct capillary structures in series and because tubuloglomerular feedback, one of the mechanisms responsible for blood flow autoregulation, is specific to renal tubules. Tubuloglomerular feedback and the myogenic mechanism, acting jointly, autoregulate single-nephron blood flow. Each generates a self-sustained periodic oscillation and an oscillating electrical signal that propagates upstream along arterioles. Similar electrical signals from other nephrons interact, allowing nephron synchronization. Experimental measurements show synchronization over fields of a few nephrons; simulations based on a simplified network structure that could obscure complex interactions predict more widespread synchronization. To permit more realistic simulations, we made a cast of blood vessels in a rat kidney, performed micro-computed tomography at 2.5-µm resolution, and recorded three-dimensional coordinates of arteries, afferent arterioles, and glomeruli. Nonterminal branches of arcuate arteries form treelike structures requiring two to six bifurcations to reach terminal branches at the tree tops. Terminal arterial structures were either paired branches at the tops of the arterial trees, from which 52.6% of all afferent arterioles originated, or unpaired arteries not at the tree tops, yielding the other 22.9%; the other 24.5% originated directly from nonterminal arteries. Afferent arterioles near the corticomedullary boundary were longer than those farther away, suggesting that juxtamedullary nephrons have longer afferent arterioles. The distance separating origins of pairs of afferent arterioles varied randomly. The results suggest an irregular-network tree structure with vascular nodes, where arteriolar activity and local blood pressure interact.
[Mh] Termos MeSH primário: Arteríolas/diagnóstico por imagem
Angiografia por Tomografia Computadorizada/métodos
Néfrons/irrigação sanguínea
Artéria Renal/diagnóstico por imagem
Microtomografia por Raio-X
[Mh] Termos MeSH secundário: Animais
Arteríolas/anatomia & histologia
Masculino
Modelos Anatômicos
Modelos Cardiovasculares
Ratos Sprague-Dawley
Artéria Renal/anatomia & histologia
Técnicas de Réplica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170421
[St] Status:MEDLINE
[do] DOI:10.1152/ajprenal.00092.2017


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[PMID]:27641675
[Au] Autor:Caine M; McCafferty MS; McGhee S; Garcia P; Mullett WM; Zhang X; Hill M; Dreher MR; Lewis AL
[Ad] Endereço:Department of Engineering and the Environment, University of Southampton, Highfield, United Kingdom; Biocompatibles UK, Lakeview, Riverside Way, Watchmoor Park, Camberley, United Kingdom GU15 3YL. Electronic address: marcus.caine@btgplc.com.
[Ti] Título:Impact of Yttrium-90 Microsphere Density, Flow Dynamics, and Administration Technique on Spatial Distribution: Analysis Using an In Vitro Model.
[So] Source:J Vasc Interv Radiol;28(2):260-268.e2, 2017 Feb.
[Is] ISSN:1535-7732
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To investigate material density, flow, and viscosity effects on microsphere distribution within an in vitro model designed to simulate hepatic arteries. MATERIALS AND METHODS: A vascular flow model was used to compare distribution of glass and resin surrogates in a clinically derived flow range (60-120 mL/min). Blood-mimicking fluid (BMF) composed of glycerol and water (20%-50% vol/vol) was used to simulate a range of blood viscosities. Microsphere distribution was quantified gravimetrically, and injectate solution was dyed to enable quantification by UV spectrophotometry. Microsphere injection rate (5-30 mL/min) and the influence of contrast agent dilution of injection solution (0%-60% vol/vol) were also investigated. RESULTS: No significant differences in behavior were observed between the glass and resin surrogate materials under any tested flow conditions (P = .182; n = 144 injections). Microspheres tend to align more consistently with the saline injection solution (r2 = 0.5712; n = 144) compared with total BMF flow distribution (r2 = 0.0104; n = 144). The most predictable injectate distribution (ie, greatest alignment with BMF flow, < 5% variation) was demonstrated with > 10-mL/min injection rates of pure saline solution, although < 20% variation with glass microsphere distribution was observed with injection solution containing as much as 30% contrast medium when injected at > 20 mL/min. CONCLUSIONS: Glass and resin yttrium-90 surrogates demonstrated similar distribution in a range of clinically relevant flow conditions, suggesting that microsphere density does not have a significant influence on microsphere distribution. Injection parameters that enhanced the mixing of the spheres with the BMF resulted in the most predictable distribution.
[Mh] Termos MeSH primário: Embolização Terapêutica/métodos
Vidro/química
Artéria Hepática/fisiopatologia
Circulação Hepática
Neoplasias Hepáticas/terapia
Modelos Anatômicos
Modelos Cardiovasculares
Compostos Radiofarmacêuticos/administração & dosagem
Resinas Sintéticas/química
Radioisótopos de Ítrio/administração & dosagem
[Mh] Termos MeSH secundário: Velocidade do Fluxo Sanguíneo
Viscosidade Sanguínea
Glicerol/química
Artéria Hepática/patologia
Seres Humanos
Neoplasias Hepáticas/irrigação sanguínea
Microesferas
Fluxo Sanguíneo Regional
Técnicas de Réplica
Água/química
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Radiopharmaceuticals); 0 (Resins, Synthetic); 0 (Yttrium Radioisotopes); 059QF0KO0R (Water); PDC6A3C0OX (Glycerol)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160920
[St] Status:MEDLINE


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[PMID]:27759412
[Au] Autor:Pott P; Rzasa A; Stiesch M; Eisenburger M
[Ad] Endereço:Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
[Ti] Título:Marginal fit of indirect composite inlays using a new system for manual fabrication.
[So] Source:Eur J Paediatr Dent;17(3):223-226, 2016 Sep.
[Is] ISSN:1591-996X
[Cp] País de publicação:Italy
[La] Idioma:eng
[Ab] Resumo:AIM: This in vitro study compares a new system for manual chair side fabrication of indirect composite restorations, which uses silicone models after alginate impressions, to CAD/CAM-technology and laboratory manual production techniques. MATRIALS AND METHODS: and study design Each 10 composite inlays were fabricated using different types of production techniques: CAD/CAM- technology (A), the new inlay system (B), plaster model after alginate impression (C) or silicone impression (D). The inlays were adapted into a metal tooth and silicone replicas of the cement gaps were made and measured. Statistical analysis was performed using ANOVA and Tukey's test. Results and Statistics In group A the biggest marginal gaps (174.9µm ± 106.2µm) were found. In group B the gaps were significantly smaller (119.5 µm ± 90.6 µm) than in group A (p=0.035). Between groups C (64.6 µm ± 68.0µm) and D (58.2 µm ± 61.7 µm) no significant differences could be found (p=0.998), but the gaps were significantly smaller compared with group B. Conclusion Chairside manufacturing of composite inlays resulted in better marginal precision than CAD/CAM technology. In comparison to build restorations in a laboratory, the new system is a timesaving and inexpensive alternative. Nevertheless, production of indirect composite restorations in the dental laboratory showed the highest precision.
[Mh] Termos MeSH primário: Resinas Compostas/química
Adaptação Marginal Dentária
Materiais Dentários/química
Planejamento de Prótese Dentária
Restaurações Intracoronárias
[Mh] Termos MeSH secundário: Alginatos/química
Sulfato de Cálcio/química
Projeto Auxiliado por Computador
Materiais para Moldagem Odontológica/química
Modelos Dentários
Seres Humanos
Teste de Materiais
Técnicas de Réplica
Silicones/química
Propriedades de Superfície
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alginates); 0 (Composite Resins); 0 (Dental Impression Materials); 0 (Dental Materials); 0 (Silicones); WAT0DDB505 (Calcium Sulfate)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170113
[Lr] Data última revisão:
170113
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:161021
[St] Status:MEDLINE


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[PMID]:27419244
[Au] Autor:de Assis FS; Lima SN; Tonetto MR; Bhandi SH; Pinto SC; Malaquias P; Loguercio AD; Bandéca MC
[Ti] Título:Evaluation of Bond Strength, Marginal Integrity, and Fracture Strength of Bulk- vs Incrementally-filled Restorations.
[So] Source:J Adhes Dent;18(4):317-23, 2016.
[Is] ISSN:1461-5185
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: This study evaluated the effect of application technique and preparation size on the fracture strength (FS), microtensile bond strength (µTBS) and marginal integrity (MI) of direct resin composite restorations. MATERIALS AND METHODS: Conservative (5 × 2 × 2 mm) or extended (5 × 4 × 2 mm) preparations below the cementoenamel junction were performed in 140 human maxillary premolars (n = 70 per group). After adhesive application (XP Bond), half of each group was restored with the bulk technique (one 4-mm increment of Surefill SDR Flow plus one 1-mm horizontal capping layer of TPH3 [Spectrum TPH3 resin composite]) and half incrementally (TPH3 in three horizontal incremental layers, 1.5 to 2 mm each), all using a metal matrix band. After storage (24 h at 37°C), the proximal surfaces of each tooth were polished with Sof-Lex disks. For FS measurement, 60 restorations were mounted in a universal testing machine and subjected to a compressive axial load applied parallel to the long axis of the tooth, running at a crosshead speed of 0.5 mm/min. For µTBS testing, 40 teeth were longitudinally sectioned to obtain resin-dentin bonded sticks from the cavity floor (bonded area: 0.8 mm2). Specimens were tested in tension at 0.5 mm/min. The external marginal integrity of both proximal surfaces was analyzed using SEM of epoxy resin replicas. The µTBS, marginal integrity, and fracture resistance data were subjected to two-way ANOVA, and Tukey's post-hoc test was used for pair-wise comparisons (a = 0.05). RESULTS: Fracture resistance, microtensile bond strength, and marginal integrity values were not statistically significantly affected by application technique or preparation size (p = 0.71, p = 0.82, and p = 0.77, respectively). CONCLUSIONS: The use of a bulk-fill flowable composite associated with a conventional resin composite as a final capping layer did not jeopardize the fracture strength, bond strength to dentin, or marginal integrity of posterior restorations.
[Mh] Termos MeSH primário: Resinas Compostas/química
Colagem Dentária
Adaptação Marginal Dentária
Materiais Dentários/química
Restauração Dentária Permanente/métodos
[Mh] Termos MeSH secundário: Preparo da Cavidade Dentária/métodos
Polimento Dentário/instrumentação
Análise do Estresse Dentário/instrumentação
Dentina/ultraestrutura
Adesivos Dentinários/química
Seres Humanos
Teste de Materiais
Bandas de Matriz
Microscopia Eletrônica de Varredura
Técnicas de Réplica
Estresse Mecânico
Propriedades de Superfície
Temperatura Ambiente
Resistência à Tração
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Composite Resins); 0 (Dental Materials); 0 (Dentin-Bonding Agents); 0 (Surefil SDR Flow); 0 (TPH spectrum); 0 (XP-Bond)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170107
[Lr] Data última revisão:
170107
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160716
[St] Status:MEDLINE
[do] DOI:10.3290/j.jad.a36516


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[PMID]:27419242
[Au] Autor:Spreafico R; Marchesi G; Turco G; Frassetto A; Di Lenarda R; Mazzoni A; Cadenaro M; Breschi L
[Ti] Título:Evaluation of the In Vitro Effects of Cervical Marginal Relocation Using Composite Resins on the Marginal Quality of CAD/CAM Crowns.
[So] Source:J Adhes Dent;18(4):355-62, 2016.
[Is] ISSN:1461-5185
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To evaluate the effect of cervical margin relocation (CMR) for crowns designed using CAD/CAM technology, and made of pre-cured resin or lithium disilicate, before and after thermomechanical loading. The test hypothesis was that the marginal quality of the crowns would not be influenced by the CMR with composite resins before or after thermomechanical loading. MATERIALS AND METHODS: Standard crown preparations were created in 40 human molars. The margins were located in enamel, except for the mesial proximal box, where the cervical margin was 2.0 mm below the cementoenamel junction, with 4.0 mm in the buccolingual and 2.0 mm in the mesiodistal dimension. For the CMR technique, a 2-mm layer of conventional or flowable composite resin was applied to the mesial box. Using the Cerec CAD/CAM system, 40 standard crowns were prepared, and restorations were luted using a dual-curing adhesive cement. SEM analysis was performed using epoxy resin replicas before and after loading to assess the marginal quality of interfaces of the mesial proximal box with CMR/crown and the distal face of the tooth without CMR. Statistical differences between groups were analyzed using the Kruskal-Wallis test and Bonferroni's post-hoc test. RESULTS: The null hypothesis was accepted, since no statistically significant differences were found in marginal quality before and after thermomechanical cycling (p > 0.05). CONCLUSION: The implementation of CMR before and after thermomechanical cycling had no effect on the quality of cervical margins. To establish whether CMR is a suitable procedure for the adhesive luting of composite resin crowns in deep proximal boxes, additional studies are required.
[Mh] Termos MeSH primário: Resinas Compostas/química
Projeto Auxiliado por Computador
Coroas
Adaptação Marginal Dentária
Materiais Dentários/química
Preparo Prostodôntico do Dente/métodos
[Mh] Termos MeSH secundário: Esmalte Dentário/anatomia & histologia
Porcelana Dentária/química
Planejamento de Prótese Dentária
Seres Humanos
Técnicas In Vitro
Teste de Materiais
Microscopia Eletrônica de Varredura
Nanocompostos/química
Nanopartículas/química
Técnicas de Réplica
Cimentos de Resina/química
Autocura de Resinas Dentárias/métodos
Dióxido de Silício/química
Estresse Mecânico
Temperatura Ambiente
Fatores de Tempo
Colo do Dente/anatomia & histologia
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Composite Resins); 0 (Dental Materials); 0 (Filtek Flow); 0 (Filtek Supreme); 0 (OptiBond FL); 0 (Resin Cements); 0 (lithia disilicate); 059QF0KO0R (Water); 12001-21-7 (Dental Porcelain); 7631-86-9 (Silicon Dioxide)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170107
[Lr] Data última revisão:
170107
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160716
[St] Status:MEDLINE
[do] DOI:10.3290/j.jad.a36514


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[PMID]:27039473
[Au] Autor:Fathi HM; Al-Masoody AH; El-Ghezawi N; Johnson A
[Ti] Título:The Accuracy of Fit of Crowns Made From Wax Patterns Produced Conventionally (Hand Formed) and Via CAD/CAM Technology.
[So] Source:Eur J Prosthodont Restor Dent;24(1):10-7, 2016 Mar.
[Is] ISSN:0965-7452
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: The aim of this study was to compare the marginal and internal fit accuracy of crowns constructed using three different wax production methods; conventional, milled, and 3D printed and utilizing three different cement gap thicknesses. METHODS: 15 identical stone dies were made for each method. Wax patterns were produced and then cast into metal crowns, which were assessed for differences in accuracy of both marginal and internal fit. Measurement points were 4 points per crown; occlusal, axial, marginal gap, and marginal discrepancy points. A silicone impression technique and conventional cementation technique were employed to facilitate the measurements. RESULTS: There was no significant difference (p > 0.05) in accuracy between the digitally and manually produced crowns, with the 3D printed crowns being slightly more accurate. Whereas, statistically significant differences were noticed between the conventional versus printed groups, in occlusal and marginal gap points (p < 0.05). CONCLUSION: The marginal and internal fit of 3D printed wax patterns is more accurate than the other two production methods. The milling of wax crowns is as accurate as the conventional hand carved production in terms of internal and marginal fit. The manufacturer recommended offset/die-spacer of 30 µm produced the most accurate internal and marginal fits.
[Mh] Termos MeSH primário: Projeto Auxiliado por Computador
Coroas
Técnica de Fundição Odontológica
Adaptação Marginal Dentária
Planejamento de Prótese Dentária
[Mh] Termos MeSH secundário: Cimentação/métodos
Projeto Auxiliado por Computador/estatística & dados numéricos
Técnica de Fundição Odontológica/instrumentação
Técnica de Fundição Odontológica/estatística & dados numéricos
Cimentos Dentários/química
Técnica de Moldagem Odontológica
Modelos Dentários
Polimento Dentário/métodos
Planejamento de Prótese Dentária/estatística & dados numéricos
Seres Humanos
Teste de Materiais
Microscopia Eletrônica de Varredura
Impressão Tridimensional
Técnicas de Réplica
Propriedades de Superfície
Ceras/química
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dental Cements); 0 (Waxes)
[Em] Mês de entrada:1605
[Cu] Atualização por classe:160404
[Lr] Data última revisão:
160404
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160405
[St] Status:MEDLINE


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[PMID]:26814320
[Au] Autor:Soliman S; Preidl R; Karl S; Hofmann N; Krastl G; Klaiber B
[Ti] Título:Influence of Cavity Margin Design and Restorative Material on Marginal Quality and Seal of Extended Class II Resin Composite Restorations In Vitro.
[So] Source:J Adhes Dent;18(1):7-16, 2016.
[Is] ISSN:1461-5185
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To investigate the influence of three cavity designs on the marginal seal of large Class II cavities restored with low-shrinkage resin composite limited to the enamel. MATERIALS AND METHODS: One hundred twenty (120) intact human molars were randomly divided into 12 groups, with three different cavity designs: 1. undermined enamel, 2. box-shaped, and 3. proximal bevel. The teeth were restored with 1. an extra-low shrinkage (ELS) composite free of diluent monomers, 2. microhybrid composite (Herculite XRV), 3. nanohybrid composite (Filtek Supreme XTE), and 4. silorane-based composite (Filtek Silorane). After artificial aging by thermocycling and storage in physiological saline, epoxy resin replicas were prepared. To determine the integrity of the restorations' approximal margins, two methods were sequentially employed: 1. replicas were made of the 120 specimens and examined using SEM, and 2. the same 120 specimens were immersed in AgNO3 solution, and the dye penetration depth was observed with a light microscope. Statistical analysis was performed using the Kruskal-Wallis and the Dunn-Bonferroni tests. RESULTS: After bevel preparation, SEM observations showed that restorations did not exhibit a higher percentage of continuous margin (SEM-analysis; p>0.05), but more leakage was found than with the other cavity designs (p<0.05). The lowest percentage of continuous margin was observed in ELS restorations (p<0.05). More fractured margins were observed in the undermined enamel cavity design groups (p<0.05). CONCLUSION: Bevel preparation failed to improve margin quality in large Class II composite restorations and is no longer recommended. However, undermined enamel should be removed to prevent enamel fractures.
[Mh] Termos MeSH primário: Resinas Compostas/química
Colagem Dentária/normas
Preparo da Cavidade Dentária/classificação
Adaptação Marginal Dentária
Materiais Dentários/química
[Mh] Termos MeSH secundário: Esmalte Dentário/ultraestrutura
Infiltração Dentária/classificação
Seres Humanos
Teste de Materiais
Microscopia Eletrônica de Varredura
Nanocompostos/química
Distribuição Aleatória
Técnicas de Réplica
Cimentos de Resina/química
Resinas de Silorano/química
Coloração pela Prata
Cloreto de Sódio/química
Propriedades de Superfície
Temperatura Ambiente
Fatores de Tempo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Composite Resins); 0 (Dental Materials); 0 (Filtek Supreme); 0 (Resin Cements); 0 (Silorane Resins); 0 (silorane composite resin); 117681-12-6 (Herculite XR); 451W47IQ8X (Sodium Chloride)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:160219
[Lr] Data última revisão:
160219
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160128
[St] Status:MEDLINE
[do] DOI:10.3290/j.jad.a35520


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[PMID]:26737977
[Au] Autor:Anderson JR; Klucznik R; Diaz O; Zhang YJ; Britz GW; Grossman RG; Karmonik C
[Ti] Título:Quantification of velocity reduction after flow diverter placement in intracranial aneurysm: An ex vivo study with 3D printed replicas.
[So] Source:Conf Proc IEEE Eng Med Biol Soc;2015:7300-3, 2015.
[Is] ISSN:1557-170X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Phase contrast MRI (pcMRI) was used to measure flow before and after placement of a flow diverter (n = 3). Decreases from 18% to 31% in flow velocity were seen in the inflow jet of the aneurysms. Flow patterns were also compared. It was observed that the gross aneurysmal flow patterns were maintained after flow diverter placement despite decreased fluid velocities. All measurements were carried out in 3D printed aneurysm replicas.
[Mh] Termos MeSH primário: Aneurisma Intracraniano/fisiopatologia
Aneurisma Intracraniano/terapia
Impressão Tridimensional
Técnicas de Réplica
[Mh] Termos MeSH secundário: Velocidade do Fluxo Sanguíneo
Seres Humanos
Imagem por Ressonância Magnética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1609
[Cu] Atualização por classe:160107
[Lr] Data última revisão:
160107
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160107
[St] Status:MEDLINE
[do] DOI:10.1109/EMBC.2015.7320077



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