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Id: biblio-950431
Autor: Pinho, Erika Christina Canarim Martha de; Chahud, Fernando; Lachat, João-José; Coutinho-Netto, Joaquim José; Sousa, Sidney Julio Faria e.
Título: The study of the use of a latex biomembrane and conjunctival autograft in rabbit conjunctiva wound healing / Estudo do implante de biomembrana de látex e auto-enxerto conjuntival em cicatrização de ferida conjuntiva de coelho
Fonte: Arq. bras. oftalmol;81(2):125-129, Mar.-Apr. 2018. tab, graf.
Idioma: en.
Resumo: RESUMO Objetivo: Estudar o uso da biomembrana de látex e o transplante conjuntival autólogo na cicatrização conjuntival em coelhos. Métodos: Em nove coelhos albinos, neo-zelandeses, machos foram removidas áreas retangulares idênticas, do quadrante supero nasal, adjacente ao limbo, de ambos os olhos. As áreas desnudas da camada esclerótica nos olhos direitos foram recobertas com biomembrana de látex e a dos olhos esquerdos com enxerto conjuntival autólogo. Os animais foram sacrificados em grupos de três, aos 7, 14 e 21 dias após a cirurgia. Os tecidos do local cirúrgico, incluindo a córnea, foram fixados em formaldeído, antes de serem processados em parafina e corados com hematoxilina e eosina. A natureza e a intensidade da resposta inflamatória e o padrão de epitelização da superfície conjuntival foram avaliados sob microscopia óptica, em seções histológicas longitudinais, passando pelo centro dos espécimes anatômicos. Resultados: Até o décimo quarto dia pós-operatório, o grupo que recebeu a biomembrana apresentou reação inflamatória mais intensa do que o grupo com auto enxerto conjuntival. Aos 14 dias, os olhos com biomembrana apresentavam-se menos inflamados e com estroma mais espesso do que aos 7 dias. Aos 21 dias, a reparação conjuntival de ambos os grupos apresentavam características semelhantes. Conclusão: Apesar de apresentar uma cicatrização mais lenta, a biomembrana de látex se mostrou tão eficaz quanto o auto enxerto conjuntival na reconstrução da superfície ocular após três semanas de cicatrização pós-operatória. Devido as suas baixas toxicidade e alergenicidade, este material parece ser uma opção terapêutica promissora na reconstrução da conjuntiva.

ABSTRACT Purpose: To study a latex biomembrane and conjunctival autograft with regard to the promotion of conjunctival healing in rabbits. Methods: The study included nine male albino rabbits. In these rabbits, a rectangular area of the conjunctiva was surgically removed from the superonasal quadrant adjacent to the limbus in both eyes. The bare area of the sclerotic coat of the right eye was reconstructed with a latex biomembrane, and the corresponding site of the left eye was reconstructed with a conjunctival autograft. The animals were killed in groups of three at 7, 14, and 21 days after surgery. The tissues from the surgical site, including the cornea, were fixed in formaldehyde, and were then processed in paraffin and stained with hematoxylin and eosin. The nature and intensity of the inflammatory response and the epithelial pattern at the conjunctival surface were evaluated under optical microscopy with longitudinal histological sections through the center of the anatomical specimens. Results: Until the 14th postoperative day, the inflammatory reaction was greater in the biomembrane group than in the conjunctival autograft group. In the latex biomembrane group, inflammation was less intense and the stroma was thicker on the 14th postoperative day than on the 7th postoperative day. After three weeks, conjunctival healing in both groups showed similar characteristics. Conclusion: Although healing was slower with a latex biomembrane, tissue reconstitution was almost the same as that with a conjunctival autograft by three weeks. A latex biomembrane is as effective as a conjunctival autograft for the reconstruction of the ocular surface. Owing to the lack of toxicity and allergenicity, a latex biomembrane appears to be a promising therapeutic option for conjunctival reconstruction.
Descritores: Cicatrização/fisiologia
Túnica Conjuntiva/transplante
Autoenxertos/fisiologia
Látex/uso terapêutico
Membranas Artificiais
-Fatores de Tempo
Índice de Gravidade de Doença
Teste de Materiais
Reprodutibilidade dos Testes
Resultado do Tratamento
Túnica Conjuntiva/patologia
Limites: Animais
Ratos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Alonso, Roberta Caroline Bruschi
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Id: biblio-1019969
Autor: Paula, Andreia Bolzan de; Alonso, Roberta Caroline Bruschi; Taparelli, Jesus Roberto; Camassari, Jéssica Rodrigues; Innocentini-Mei, Lúcia Helena; Correr-Sobrinho, Lourenço; Puppin-Rontani, Regina M.
Título: Influence of the incorporation of triclosan methacrylate on the physical properties and antibacterial activity of resin composite
Fonte: J. appl. oral sci;27:e20180262, 2019. tab.
Idioma: en.
Projeto: FAPESP.
Resumo: Abstract The incorporation of antimicrobials in the composites as an attempt to reduce bacterial adhesion without jeopardizing mechanical properties is a challenge for Dentistry. Objective: To evaluate the bacterial adhesion and physical properties of a composite containing the methacrylate triclosan- derivative monomer (TM). Methodology: TM was synthesized and added to an experimental composite. Samples were divided into two groups: Control and TM (13.4 wt%). Antibacterial Activity: Three specimens of each material were prepared and placed on bacterial suspensions of Streptococcus mutans for 1, 5 and 10 days. After these periods the counting of the colonies (log10) was performed. Assays was performed in triplicate. Physical Properties: Three-body Abrasion (TBA): Ten specimens of each material were prepared and stored at 37°C/24 h. The surface roughness (Ra) and hardness (KHN) were analyzed. Next, the specimens were submitted to abrasive wear (30,000 cycles) and re-evaluated for Ra and KHN; Sorption/solubility (SS): cylindrical specimens (n=10) were prepared and weighted. The specimens were immersed in deionized water for 7 days at 37°C and then their weight was verified again. SS were calculated using accepted formulas; Diametral tensile strength (DTS): specimens (n=10) underwent test performed in an Instron universal testing machine at a crosshead speed of 1 mm/min. Data were submitted to appropriate statistical tests according to data distribution and assay (p<0.05). Results: Bacterial Adhesion: TM showed a significant reduction on biofilm accumulation in the evaluated periods: 1 day (1.537±0.146); 5 days (2.183±0.138) and 10 days (4.469±0.155) when compared with Control: 1 day (4.954±0.249); 5 days (5.498±0.257) and 10 days (6.306±0.287). Physical Properties: For TBA, SS and DTS no significant difference was found between groups Control and TM. The incorporation of methacrylate triclosan-based monomer in the experimental composite reduce bacterial adhesion of S. mutans and did not affect important polymer properties.
Descritores: Triclosan/química
Resinas Compostas/química
Metacrilatos/química
Antibacterianos/química
-Valores de Referência
Solubilidade
Streptococcus mutans/efeitos dos fármacos
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Escovação Dentária
Triclosan/farmacologia
Aderência Bacteriana/efeitos dos fármacos
Teste de Materiais
Contagem de Colônia Microbiana
Reprodutibilidade dos Testes
Resinas Compostas/farmacologia
Testes de Dureza
Metacrilatos/farmacologia
Antibacterianos/farmacologia
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1019971
Autor: Lopes, Fabiane Carneiro; Zangirolami, Caio; Mazzi-Chaves, Jardel Francisco; Silva-Sousa, Alice Corrêa; Crozeta, Bruno Monguilhott; Silva-Sousa, Yara Teresinha Corrêa; Sousa-Neto, Manoel Damião.
Título: Effect of sonic and ultrasonic activation on physicochemical properties of root canal sealers
Fonte: J. appl. oral sci;27:e20180556, 2019. tab, graf.
Idioma: en.
Resumo: Abstract Objective: To evaluate the effect of ultrasonic and sonic activation on physicochemical properties of AH Plus, MTA Fillapex, ADSeal, GuttaFlow Bioseal, and GuttaFlow 2 sealers. Methodology: Three experimental groups were formed: no activation (NA), ultrasonic activation (UA), and sonic activation (SA). The sealers were manipulated according to the manufacturers' instructions. A 3-mL syringe was adapted to receive 1 mL of sealer. Activation was performed with a 20/.01 ultrasonic insert (20 s/1W) in the UA group. A size 35.04 sonic tip was used (20 s/10,000 cycles/min-1) in the SA group. The molds for physicochemical analysis were filled and evaluated according to ANSI/ADA specification no. 57: setting time (ST), flow (FL), dimensional change (DC), solubility (SB), and radiopacity (RD). Statistical analysis was performed by Kruskal-Wallis, one-way ANOVA, and Tukey's tests (P<0.05). Results: Regarding ST, only AH Plus and GuttaFlow 2 in the NA group met the ANSI/ADA standards. All FL values were greater than 20 mm in diameter, as determined by ANSI/ADA. The tested sealers and protocols did not comply with the ANSI/ADA standards for DC. As for SB, only MTA Fillapex, regardless of the activation protocol, did not follow the ANSI/ADA standards. All of the investigated sealers, regardless of the activation protocol, presented radiographic density higher than 3 mm Al, as proposed by ANSI/ADA. Conclusions: UA and SA promoted changes in the physicochemical properties of the evaluated root canal sealers, mainly in ST and F. Thus, it is important to evaluate the physicochemical properties of endodontic sealers associated with activation techniques prior to clinical application in order to determine whether the properties follow the parameters set by ANSI/ADA, ensuring safety and quality of root canal filling.
Descritores: Óxidos/química
Materiais Restauradores do Canal Radicular/química
Silicatos/química
Compostos de Cálcio/química
Compostos de Alumínio/química
Dimetilpolisiloxanos/química
Resinas Epóxi/química
Ondas Ultrassônicas
Guta-Percha/química
-Valores de Referência
Solubilidade
Propriedades de Superfície
Fatores de Tempo
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Estatísticas não Paramétricas
Combinação de Medicamentos
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1040225
Autor: Suárez-López Del Amo, Fernando; Rodriguez, Juan C; Asa'ad, Farah; Wang, Hom-Lay.
Título: Comparison of two soft tissue substitutes for the treatment of gingival recession defects: an animal histological study
Fonte: J. appl. oral sci;27:e20180584, 2019. tab, graf.
Idioma: en.
Resumo: Abstract Objectives: This study aimed to compare two different soft tissue replacement grafts in their ability to treat gingival recession defects and successfully integrate with the surrounding tissues. Methodology: Nine beagle dogs were included and followed up to 10 weeks. Sites for intervention were allocated to one of the grafting materials investigated. Treatment consisted of coronally advanced flap combined with one of the two soft tissue substitutes on a previous surgically created defect. Materials employed were porcine-derived acellular dermal matrix (ADM) [Novomatrix™ (Test)] and collagen-based matrix (CBM) [Mucograft® (Control)]. Animals were sacrificed at 2, 6, and 10 weeks postoperatively and compared using descriptive histology and histomorphometric outcomes. Results: Macroscopic findings were similar between test and control groups at all intervals. After 10 weeks, both groups demonstrated successful incorporation of the grafting materials without signs of rejection and with comparable tissue integration. The histomorphometric data were similar between groups at 2 weeks; however, the test group provided greater root coverage and increase in tissue thickness than the control at 6- and 10-weeks post surgically. Conclusions: Both porcine-derived ADM and CBM revealed similar histological outcomes with successful integration and absence of adverse events. Test group provided superior outcomes regarding root coverage and increase in tissue thickness.
Descritores: Colágeno/uso terapêutico
Derme Acelular
Retração Gengival/cirurgia
-Valores de Referência
Retalhos Cirúrgicos
Suínos
Fatores de Tempo
Vasos Sanguíneos/patologia
Teste de Materiais
Reprodutibilidade dos Testes
Resultado do Tratamento
Gengiva/cirurgia
Gengiva/patologia
Retração Gengival/patologia
Limites: Animais
Cães
Tipo de Publ: Estudo Comparativo
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1040226
Autor: Tang, Jing-jing; Shen, Zong-shan; Qin, Wei; Lin, Zhengmei.
Título: A comparison of the sealing abilities between Biodentine and MTA as root-end filling materials and their effects on bone healing in dogs after periradicular surgery
Fonte: J. appl. oral sci;27:e20180693, 2019. graf.
Idioma: en.
Projeto: International Cooperation Project of Science and Technology in Guangdong Province; . National Natural Science Foundation of China.
Resumo: ABSTRACT Objectives: To compare the sealing ability and biocompatibility of Biodentine with mineral trioxide aggregate (MTA) when used as root-end filling materials. Methodology: The Cell Counting Kit-8 (CCK-8) assay was used to compare the cytotoxicity of MTA and Biodentine. Twenty-one extracted teeth with a single canal were immersed in an acidic silver nitrate solution after root-end filling. Then, the volume and depth of silver nitrate that infiltrated the apical portion of the teeth were analyzed using micro-computed tomography (micro-CT). Seventy-two roots from 3 female beagle dogs were randomly distributed into 3 groups and apical surgery was performed. After six months, the volume of the bone defect surrounding these roots was analyzed using micro-CT. Results: Based on the results of the CCK-8 assay, MTA and Biodentine did not show statistically significant differences in cytotoxicity (P>0.05). The volume and the depth of the infiltrated nitrate solution were greater in the MTA group than in the Biodentine group (P<0.05). The volume of the bone defect was larger in the MTA group than in the Biodentine group. However, the difference was not significant (P>0.05). The volumes of the bone defects in the MTA and Biodentine groups were smaller than the group without any filling materials (P<0.05). Conclusions: MTA and Biodentine exhibited comparable cellular biocompatibility. Biodentine showed a superior sealing ability to MTA in root-end filling. Both Biodentine and MTA promoted periradicular bone healing in beagle dog periradicular surgery models.
Descritores: Óxidos/farmacologia
Tecido Periapical/efeitos dos fármacos
Ligamento Periodontal/efeitos dos fármacos
Materiais Restauradores do Canal Radicular/farmacologia
Tratamento do Canal Radicular/métodos
Cicatrização/efeitos dos fármacos
Silicatos/farmacologia
Compostos de Cálcio/farmacologia
Compostos de Alumínio/farmacologia
-Osteogênese/efeitos dos fármacos
Tecido Periapical/citologia
Tecido Periapical/diagnóstico por imagem
Ligamento Periodontal/diagnóstico por imagem
Fatores de Tempo
Raiz Dentária/cirurgia
Raiz Dentária/efeitos dos fármacos
Raiz Dentária/diagnóstico por imagem
Regeneração Óssea/efeitos dos fármacos
Teste de Materiais
Contagem de Células
Células Cultivadas
Reprodutibilidade dos Testes
Resultado do Tratamento
Combinação de Medicamentos
Microtomografia por Raio-X
Limites: Humanos
Animais
Masculino
Adolescente
Cães
Tipo de Publ: Estudo Comparativo
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1040232
Autor: Fouda, Shaimaa M; Gad, Mohammed M; Ellakany, Passent; Al-Thobity, Ahmad M; Al-Harbi, Fahad A; Virtanen, Jorma I; Raustia, Aune.
Título: The effect of nanodiamonds on candida albicans adhesion and surface characteristics of PMMA denture base material - an in vitro study
Fonte: J. appl. oral sci;27:e20180779, 2019. tab, graf.
Idioma: en.
Resumo: Abstract Candida albicans is the main causative pathogen of denture stomatitis, which affects many complete denture patients. Objective: To evaluate the effect of different concentrations of nanodiamonds (NDs) added to polymethyl methacrylate (PMMA) denture base material on Candida albicans adhesion as well as on surface roughness and contact angle. Methodology: Acrylic resin specimens sized 10×10×3 mm3 were prepared and divided into four groups (n=30) according to ND concentration (0%, 0.5%, 1%, 1.5% by wt). Surface roughness was measured with a profilometer, and the contact angle with a goniometer. The effect of NDs on Candida albicans adhesion was evaluated using two methods: 1) slide count and 2) direct culture test. Analysis of variance (ANOVA) and Tukey's post hoc test were used in the statistical analyses. Results: Addition of NDs decreased the Candida albicans count significantly more than in the control group (p<0.05), with a lowest of 1% NDs. Addition of NDs also significantly decreased the surface roughness (p<0.05), but the contact angle remained the same. Incorporation of NDs into the PMMA denture base material effectively reduced Candida albicans adhesion and decreased surface roughness. Conclusion: PMMA/NDs composites could be valuable in the prevention of denture stomatitis, which is considered one of the most common clinical problems among removable denture wearers.
Descritores: Resinas Acrílicas/química
Candida albicans/efeitos dos fármacos
Polimetil Metacrilato/química
Bases de Dentadura/microbiologia
Nanodiamantes/microbiologia
Nanodiamantes/química
-Valores de Referência
Estomatite sob Prótese/microbiologia
Estomatite sob Prótese/prevenção & controle
Propriedades de Superfície
Teste de Materiais
Microscopia Eletrônica de Varredura
Reprodutibilidade dos Testes
Análise de Variância
Limites: Humanos
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Amaral, Cristiane Mariote
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Id: biblio-1101251
Autor: MIRANDA, Maria Elisa da Silva Nunes Gomes; SILVA, Eduardo Moreira da; OLIVEIRA, Mariana Flôres de; SIMMER, Fabiana Souza; SANTOS, Glauco Botelho dos; AMARAL, Cristiane Mariote.
Título: Resin-dentin bond stability of etch-and-rinse adhesive systems with different concentrations of MMP inhibitor GM1489
Fonte: J. appl. oral sci;28:e20190499, 2020. tab, graf.
Idioma: en.
Projeto: CAPES.
Resumo: Abstract Enzymatic degradation of the hybrid layer can be accelerated by the activation of dentin metalloproteinases (MMP) during the bonding procedure. MMP inhibitors may be used to contain this process. Objective To evaluate the degree of conversion (DC%), dentin bond strength (µTBS) (immediate and after 1 year of storage in water), and nanoleakage of an experimental (EXP) and a commercial (SB) adhesive system, containing different concentrations of the MMP inhibitor GM1489: 0, 1 µM, 5 µM and 10 µM. Methodology DC% was evaluated by FT-IR spectroscopy. Dentin bond strength was evaluated by µTBS test. Half of beams were submitted to the µTBS test after 24 h and the other half, after storage for 1 year. From each tooth and storage time, 2 beams were reserved for nanoleakage testing. Data were analyzed using ANOVA and Tukey's test to compare means (α=0.05). Results All adhesive systems maintained the µTBS after 1 year of storage. Groups with higher concentrations of inhibitor (5 µM and 10 µM) showed higher µTBS values than groups without inhibitor or with 1 µM. The nanoleakage values of all groups showed no increase after 1 year of storage and values were similar for SB and EXP groups, in both storage periods. The inhibitor did not affect the DC% of the EXP groups, but the SB5 and SB10 groups showed higher DC% values than those of SB0 and SB1. Conclusions The incorporation of GM1489 in the adhesive systems had no detrimental effect on DC%. The concentrations of 5 µM GM1489 for SB and 5 µM or 10 µM for EXP provided higher μTBS than groups without GM1489, in the evaluation after 1 year of storage; whereas the concentration of inhibitor did not affect adhesive systems nanoleakage.
Descritores: Polietilenoglicóis/química
Ácidos Polimetacrílicos/química
Cimentos Dentários/química
Dentina/química
Inibidores de Metaloproteinases de Matriz/química
Metacrilatos/química
-Valores de Referência
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Colagem Dentária/métodos
Espectroscopia de Infravermelho com Transformada de Fourier
Estatísticas não Paramétricas
Infiltração Dentária
Dentina/efeitos dos fármacos
Corrosão Dentária/métodos
Limites: Humanos
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1090787
Autor: YOSHIDA, Keiichi.
Título: Influence of alumina air-abrasion for highly translucent partially stabilized zirconia on flexural strength, surface properties, and bond strength of resin cement
Fonte: J. appl. oral sci;28:e20190371, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Objective This study aims to evaluate the influence of different air-abrasion pressures and subsequent heat treatment on the flexural strength, surface roughness, and crystallographic phases of highly translucent partially stabilized zirconia (Y-PSZ), and on the tensile bond strength of resin cement to Y-PSZ. Methodology Fully sintered zirconia specimens were ground with SiC paper (control) and/or air-abraded with 50 µm particles of alumina at 0.1, 0.15, 0.2, or 0.3 MPa or left as-sintered. After air-abrasion at 0.2 MPa (0.2AB), additional specimens were then heated to 1500°C, and held for one hour at this temperature (0.2AB+HT1h). Flexural strength and surface roughness were evaluated. Crystalline phase identification was also carried out using X-ray diffraction. Bonded zirconia specimens with self-adhesive resin cement were stored in distilled water at 37°C for 24 h, either with or without aging (thermal cycling 4-60°C/20000). Results were analyzed statistically by ANOVA and Tukey-Kramer tests. Results The flexural strength decreased with the increase in air-abrasion pressure, while in contrast, the surface roughness increased. The lowest flexural strength and the highest roughness value were found for the 0.2AB and 0.3AB groups, respectively. All groups contained cubic-, tetragonal ( t )-, and rhombohedral ( r )-ZrO2 phases with the exception of the as-sintered group. Upon increasing the air-abrasion pressure, the relative amount of the r -ZrO2 phase increased, with a significant amount of r -ZrO2 phase being detected for the 0.2AB and 0.3AB groups. The 0.2AB+HT1h group exhibited a similar flexural strength and t -ZrO2 phase content as the as-sintered group. However, the 0.2AB group showed a significantly higher tensile bond strength (p<0.05) than the 0.2AB+HT1h group before and after aging. Conclusion Micromechanical retention by alumina air-abrasion at 0.2 MPa, in combination with chemical bonding of a resin to highly translucent Y-PSZ using a MDP-containing resin cement may enable durable bonding.
Descritores: Zircônio/química
Colagem Dentária/métodos
Cimentos de Resina/química
Abrasão Dental por Ar/métodos
Óxido de Alumínio/química
-Valores de Referência
Propriedades de Superfície
Resistência à Tração
Difração de Raios X/métodos
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Microscopia Confocal/métodos
Resistência à Flexão
Temperatura Alta
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1090784
Autor: Oglakci, Burcu; Kazak, Magrur; Donmez, Nazmiye; Dalkilic, Evrim Eliguzeloglu; Koymen, Safiye Selin.
Título: The use of a liner under different bulk-fill resin composites: 3D GAP formation analysis by x-ray microcomputed tomography
Fonte: J. appl. oral sci;28:e20190042, 2020. graf.
Idioma: en.
Resumo: Abstract Gap formation of composite resin restorations is a serious shortcoming in clinical practice. Polymerization shrinkage stress exceeds the tooth-restoration bond strength, and it causes bacterial infiltration within gaps between cavity walls and the restorative material. Thus, an intermediate liner application with a low elastic modulus has been advised to minimize polymerization shrinkage as well as gap formation. Objective: The purpose of this in vitro study was to assess gap formation volume in premolars restored with different bulk-fill composites, with and without a resin-modified glass-ionomer cement (RMGIC) liner, using x-ray micro-computed tomography (micro-CT). Methodology: Sixty extracted human maxillary premolars were divided into six groups according to bucco-palatal dimensions (n=10). Standardized Class II mesio-occluso-distal cavities were prepared. G-Premio Bond (GC Corp., Japan) was applied in the selective-etch mode. Teeth were restored with high-viscosity (Filtek Bulk Fill, 3M ESPE, USA)-FB, sonic-activated (SonicFill 2, Kerr, USA)-SF and low viscosity (Estelite Bulk Fill Flow, Tokuyama, Japan)-EB bulk-fill composites, with and without a liner (Ionoseal, Voco GmbH, Germany)-L. The specimens were subjected to 10,000 thermocycles (5-55°C) and 50,000 simulated chewing cycles (100 N). Gap formation based on the volume of black spaces at the tooth-restoration interface was quantified in mm3 using micro-computed tomography (SkyScan, Belgium), and analyses were performed. Data were analyzed using repeated-measures ANOVA and the Bonferroni correction test (p < 0.05). Results: The gap volume of all tested bulk-fill composites demonstrated that Group SF (1.581±0.773) had significantly higher values than Group EB (0.717±0.679). Regarding the use of a liner, a significant reduction in gap formation volume was observed only in Group SFL (0.927±0.630) compared with Group SF (1.581±0.773). Conclusion: It can be concluded that different types of bulk-fill composite resins affected gap formation volume. Low-viscosity bulk-fill composites exhibited better adaptation to cavity walls and less gap formation than did sonic-activated bulk-fill composites. The use of an RMGIC liner produced a significant reduction in gap formation volume for sonic-activated bulk-fill composites.
Descritores: Resinas Compostas/química
Imageamento Tridimensional/métodos
Preparo da Cavidade Dentária/métodos
Materiais Dentários/química
Restauração Dentária Permanente/métodos
-Técnicas In Vitro
Teste de Materiais
Cimentos de Resina
Análise do Estresse Dentário
Microtomografia por Raio-X
Polimerização
Limites: Humanos
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Texto completo SciELO Brasil
Buzalaf, Marilia Afonso Rabelo
Texto completo
Id: biblio-1090782
Autor: SIMÕES, Ana Clara Correa Duarte; DIONIZIO, Aline; CÂMARA, João Victor Frazão; SABINO-ARIAS, Isabela Tomazini; LEVY, Flávia Mauad; VENTURA, Talita Mendes Oliveira; BUZALAF, Nathalia Rabelo; BATISTA, Thiago Beltrami Dias; MAGALHÃES, Ana Carolina; GROISMAN, Sonia; BUZALAF, Marília Afonso Rabelo.
Título: Do commercial whitening dentifrices increase enamel erosive tooth wear?
Fonte: J. appl. oral sci;28:e20190163, 2020. tab, graf.
Idioma: en.
Projeto: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior.
Resumo: Abstract Objective This in vitro study evaluated the effect of commercial whitening dentifrices on erosive tooth wear (ETW) of bovine enamel samples, in comparison with commercial regular dentifrices. Methodology Sixty bovine crowns were embedded in acrylic resin, polished and then had their baseline profile determined. They were randomly assigned to 5 groups (n=12/group), according to the type of commercial dentifrice to be tested: GI - Crest Anti-cavity Regular; GII - Crest 3D White; GIII - Colgate Total 12 Clean Mint; GIV - Colgate Optic White; GV - Placebo (negative control, fluoride-free dentifrice). The samples were submitted to daily erosive and abrasive challenges for 3 days. The erosive challenges were performed 3 times a day by immersing the specimens in 0.1% citric acid solution (pH 2.5) for 90 s. Each day after the first and last erosive challenges, the specimens were subjected to the abrasive challenge for 15 s, using a toothbrushing machine (Biopdi, São Carlos, SP, Brazil), soft toothbrushes and slurry (1:3 g/ml) of the tested toothpastes (1.5 N). The specimens were kept in artificial saliva between the challenges. The final profile was obtained and the ETW (µm) was calculated. Data were analyzed by Kruskal-Wallis and Dunn's tests (p<0.05). Results All dentifrices tested significantly reduced the enamel wear in comparison with the Placebo, except GIII. The median (95% CI) ETW was 1.35 (1.25-1.46)bc for GI, 1.17 (1.01-1.34)cd for GII, 1.36 (1.28-1.45)ab for GIII, 1.08 (1.04-1.14)d for GIV and 2.28 (2.18-2.39)a for GV. Conclusion When dentifrices from the same manufacturer were compared, the whitening dentifrices led to similar or less wear than the regular ones.
Descritores: Erosão Dentária/induzido quimicamente
Cremes Dentais/efeitos adversos
Esmalte Dentário/efeitos dos fármacos
Clareadores Dentários/efeitos adversos
-Propriedades de Superfície
Fatores de Tempo
Escovação Dentária/efeitos adversos
Cremes Dentais/química
Teste de Materiais
Estatísticas não Paramétricas
Esmalte Dentário/química
Clareadores Dentários/química
Limites: Animais
Bovinos
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta



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