Base de dados : LILACS
Pesquisa : D02.241.223.100.050.500 [Categoria DeCS]
Referências encontradas : 3 [refinar]
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Texto completo SciELO Brasil
Martins, Luis Roberto Marcondes
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Id: biblio-974442
Autor: Leite, Thatiana de Vicente; Cavalcanti, Andrea Nóbrega; Lima, Adriano Fonseca de; Gonçalves, Luciano de Souza; Watts, David Christopher; Baron, Giselle Maria Marchi; Martins, Luis Roberto Marcondes.
Título: Light curing resin cements containing iodonium salts promote suitable apical bonding of posts to radicular dentin
Fonte: Braz. oral res. (Online);32:e116, 2018. tab, graf.
Idioma: en.
Resumo: Abstract The aim of this study was to analyze the efficiency of experimental light-curing resin cements (ERCs) with a ternary photo-initiator system containing diphenyliodonium hexafluorphosphate (DPI) and different amines on retention of glass-fiber posts to dentin (GFP). ERCs formulations: a 1:1 mass ratio of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenylpropane and triethyleneglycol dimethacrylate. Camphorquinone was used as initiator. Six experimental groups were established according to the amine used: [ethyl-4-(dimethylamino)benzoate-EDMAB or 2-(dimethylamino)ethyl methacrylate-DMAEMA] and the concentration of DPI (0, 0.5 mol%, 1 mol%). The resin cements Variolink II (dual- and light-cured versions) were used as commercial reference. Eighty recently extracted bovine incisors (n = 10) were selected for this study. The roots were prepared and the fiber posts were cemented with the resin cement specified for each experimental group. Specimens from coronal, middle, and apical thirds of the root were subjected to push-out bond strength test 24 hours after bonding. Data were subjected to split-plot ANOVA and the Tukey test (p = 0.05). ERCs containing DPI showed statistically significant higher bond strengths compared with ERCs without DPI. ERCs containing DPI were statistically similar to VARIOLINK II - dual-cured and superior to VARIOLINK II - light-cured (except for EDMAB - 1DPI in the medium third and DMAEMA - 1DPI in the coronal third). Different amines did not influence post retention. The apical root region showed the lowest bond strength for the groups EDAB-0DPI, DMAEMA-0DPI and VARIOLINK II light-cured. Light-cured ERCs containing DPI were efficient for GFP retention to radicular dentin, with similar behaviour to that of dual-curing commercial resin cement.
Descritores: Oniocompostos/química
Compostos de Bifenilo/química
Técnica para Retentor Intrarradicular
Ápice Dentário/efeitos dos fármacos
Cimentos de Resina/química
Dentina/efeitos dos fármacos
Cura Luminosa de Adesivos Dentários/métodos
Fotoiniciadores Dentários/química
-Oniocompostos/efeitos da radiação
Fatores de Tempo
Fraturas dos Dentes
Compostos de Bifenilo/efeitos da radiação
Teste de Materiais
Análise de Variância
Ápice Dentário/efeitos da radiação
Cimentos de Resina/efeitos da radiação
Dentina/efeitos da radiação
Luzes de Cura Dentária
Fotoiniciadores Dentários/efeitos da radiação
Polimerização
para-Aminobenzoatos/efeitos da radiação
para-Aminobenzoatos/química
Vidro/efeitos da radiação
Vidro/química
Metacrilatos/efeitos da radiação
Metacrilatos/química
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Texto completo SciELO Brasil
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Id: biblio-974458
Autor: Lima, Giana da Silveira; Moreira, Andressa Goicochea; Meereis, Carine Tais Welter; Lima, Ginia Brito; Leal, Fernanda Barbosa; Moraes, Rafael Ratto de; Ogliari, Fabrício A; Petzhold, Cesar Liberato; Piva, Evandro.
Título: Long-term bonding efficacy of adhesives containing benzodioxioles as alternative co-initiators
Fonte: Braz. oral res. (Online);32:e104, 2018. tab, graf.
Idioma: en.
Projeto: CNPq; . CNPq.
Resumo: Abstract This study evaluated the three-year lifespan of the bond to dentin of experimental self-etch adhesives containing benzodioxole derivatives - 1,3-benzodioxole (BDO) and piperonyl alcohol (PA) - as co-initiator alternative to amines. Adhesive resins were formulated using Bis-GMA, TEGDMA, HEMA, camphorquinone and different co-initiators: BDO, PA or ethyl 4-dimethylamino benzoate (EDAB - amine). An experimental self-etch primer was used to complete the two-step, self-etch adhesive system. Clearfil SE Bond (CSE) was used as commercial reference. Bond strength to human dentin was assessed by microtensile bond strength (µTBS) test, and failure mode was classified. Morphology of the dentin bonding interface was assessed via scanning electron microscopy (SEM). Irrespective of the dental adhesives evaluated, µTBS was higher after 24 hours compared with that after 1.5 and 3 years (p ≤ 0.001). However, adhesives with BDO and PA as co-initiators showed significantly higher bond strength than the bonding resin with EDAB (p ≤ 0.002), independent of the time evaluated. The commercial adhesive CSE showed similar bond strength compared with the other groups (p ≥ 0.05). Mixed failures were mainly observed after 24 hours, while adhesive failures were more frequently observed after 1.5 and 3 years. No notable differences in homogeneity and continuity along the bonded interfaces were detected among the materials in the SEM analysis. In conclusion, benzodioxole derivatives are feasible alternative co-initiators to tertiary amine in camphorquinone-based self-etching dental adhesive formulations.
Descritores: Álcoois Benzílicos/química
Adesivos Dentinários/química
Cimentos de Resina/química
Dentina/efeitos dos fármacos
Dioxóis/química
Benzodioxóis/química
para-Aminobenzoatos/química
-Polietilenoglicóis/química
Ácidos Polimetacrílicos/química
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Teste de Materiais
Cânfora/análogos & derivados
Cânfora/química
Microscopia Eletrônica de Varredura
Reprodutibilidade dos Testes
Colagem Dentária/métodos
Bis-Fenol A-Glicidil Metacrilato/química
Dentina/química
Metacrilatos/química
Limites: Humanos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Id: biblio-893634
Autor: EPASINGHE, Don Jeevanie; YIU, Cynthia Kar Yung; BURROW, Michael Francis.
Título: Mechanical properties, water sorption characteristics, and compound release of grape seed extract-incorporated resins
Fonte: J. appl. oral sci;25(4):412-419, July-Aug. 2017. tab, graf.
Idioma: en.
Resumo: Abstract Objective This study evaluated the effect of grape seed extract (GSE) incorporation on the mechanical properties, water sorption, solubility, and GSE release from the experimental adhesive resins. Material and Methods An experimental comonomer mixture, consisting of 40% Bis-GMA, 30% Bis MP, 28% HEMA, 0.26% camphorquinone and 1% EDMAB, was used to prepare four GSE-incorporated adhesive resins at concentrations of 0.5, 1, 1.5, and 2 wt%. The neat resin without GSE was used as the control. Six resin beams (25 mm x 2 mm x 2 mm) per group were prepared for flexural strength and modulus of elasticity evaluations using a universal testing machine at a crosshead speed of 1 mm/min. Five disks (6 mm in diameter and 2 mm in thickness) per group were used for microhardness measurements using a Leitz micro-hardness tester with Leica Qgo software. Five disks (7 mm in diameter and 2 mm in thickness) per group were prepared and stored in deionized water for 28 days. Water sorption, solubility, and GSE release in deionized water were calculated for each GSE-incorporated adhesive at the end of 28th day. Data was evaluated using one-way ANOVA and Tukey multiple comparisons. Results Flexural strength, modulus of elasticity and microhardness of GSE-incorporated adhesive decreased significantly with incorporation of 1.5% of GSE (p<0.05). Addition of GSE had no effect on the water sorption of the adhesive resins (p=0.33). The solubility of the resin also increased significantly with incorporation of 1.5% of GSE (p<0.05). Quantities of GSE release increased with increased concentration of GSE in the adhesive resin. Conclusion Up to 1% of GSE can be incorporated into a dental adhesive resin without interfering with the mechanical properties or solubility of the resins.
Descritores: Bis-Fenol A-Glicidil Metacrilato/química
Cânfora/análogos & derivados
Extrato de Sementes de Uva/química
Metacrilatos/química
para-Aminobenzoatos/química
Cimentos de Resina/química
-Análise de Variância
Cânfora/química
Módulo de Elasticidade
Testes de Dureza
Teste de Materiais
Maleabilidade
Proantocianidinas/química
Valores de Referência
Reprodutibilidade dos Testes
Solubilidade
Estatísticas não Paramétricas
Fatores de Tempo
Água/química
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME



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