RESUMO
Aim: This in vitro study evaluated gap width formation and marginal microleakage in Class IIcomposite restorations light-cured with three different light-curing units. Methods: Standardizedcavities in the proximal surfaces of 36 human third molars were made with margins located belowthe cementoenamel junction. Cavities were restored with Filtek P60 (3M ESPE), inserted with aphotocondenser tip and light-cured with three different methods: GI - Optilux401 (halogen); GII ColtoluxLED (LED) and GIII UltraLumeLED5 (LED). After finishing the restorations, teeth weresubjected to a thermal cycling regimen of 500 cycles (5oC ± 2oC and 55oC ± 2oC), totalizing 500cycles. Thereafter, the teeth were sectioned in a buccolingual direction and in the center of therestorations. Half of the specimens (18) were used to evaluate marginal microleakage, by measuringof dye penetration in cross-sectioned specimens, and the other half was used to analyzed the gapformation width by SEM observations (1000X). Data were submitted to Kruskal-Wallis (α=0.05).Results: The mean values of gap width (μm) were: GI 3.28±3.34; GII 1.48±1.89 and GIII3.11±3.45, and microleakage was not affected by the light-curing units. Conclusions: Therewere no differences between the light-curing methods in gap formation and marginal microleakage.
Assuntos
Resinas Compostas , Lâmpadas de Polimerização Dentária , PolimerizaçãoRESUMO
This study was done to assess the influence of the topical application of two different desensitizing agents on dentin permeability and dentinal tubule occlusion. Twenty-one rats provided 84 teeth: 36 for the in vitro and 48 for the in vivo investigation. The following agents were tested: Group 1, 2% potassium nitrate plus 2% sodium fluoride gel; Group 2, 5% sodium fluoride varnish; Group 3, 3% hydroxyethylcellulose gel (control). Cervical cavities were prepared and EDTA was applied to expose the dentinal tubules. After each treatment, Evans blue dye was applied to the teeth. Dentin permeability, scanning electron microscope (SEM) sections, and energy dispersive X-ray (EDX) were analyzed. One-way ANOVA was used to compare the data. There were significant differences (P < 0.05) among groups for dentin permeability, number of tubules/mm(2), tubule area and tubular diameter. Groups 1 and 2 (both in vitro and in vivo) showed open and partially occluded tubules. Group 3 had the most open tubules. EDX revealed similar composition for both experimental conditions. Within the limits of the study, 2% nitrate potassium plus 2% sodium fluoride gel and 5% fluoride varnish decreased the dentin permeability, resulting in partial tubular occlusion.
Assuntos
Dessensibilizantes Dentinários/farmacologia , Permeabilidade da Dentina/efeitos dos fármacos , Nitratos/farmacologia , Compostos de Potássio/farmacologia , Fluoreto de Sódio/farmacologia , Animais , Dentina/efeitos dos fármacos , Dentina/ultraestrutura , Combinação de Medicamentos , Fluoretos Tópicos , Masculino , Microscopia Eletrônica de Varredura , Distribuição Aleatória , Ratos , Ratos Wistar , Reprodutibilidade dos Testes , Espectrometria por Raios XRESUMO
Previous studies have demonstrated the efficacy of mineral trioxide aggregate (MTA) in repair of furcal perforation. In this article, the use of MTA in treating 2 cases of furcal perforation (accidental and caries-related) and subsequent long-term follow-up are described.
Assuntos
Compostos de Alumínio/uso terapêutico , Compostos de Cálcio/uso terapêutico , Óxidos/uso terapêutico , Materiais Restauradores do Canal Radicular/uso terapêutico , Silicatos/uso terapêutico , Traumatismos Dentários/terapia , Raiz Dentária/lesões , Adulto , Instrumentos Odontológicos/efeitos adversos , Combinação de Medicamentos , Feminino , Seguimentos , Humanos , Preparo de Canal Radicular/efeitos adversos , Preparo de Canal Radicular/instrumentação , Cárie Radicular/complicações , Traumatismos Dentários/etiologiaRESUMO
O objetivo deste trabalho foi avaliar o uso coadjuvante de um gel de clorexidina a 1 por cento, gel de metronidazol a 10 por cento ou gel placebo, aplicados no meio subgengival antes e imediatamente após os procedimentos de raspagem e alisamento radicular em 10 pacientes com doenças periodontal. Índice de placa, sangramento à sondagem, profundidade clínica a sondagem e nível de inserçäo clínico foram avaliados no início do experimento (tempo 0) e após 1, 3 e 6 meses. Os resultados demonstraram reduções estatisticamente significantes em todos os parâmetros clínicos avaliados em relaçäo ao tempo 0, porém sem diferenças entre os grupos experimentais. Desta forma, os produtos avaliados näo promovem benefícios adicionais em relaçäo à terapia mecânica convencional, quando empregados no meio subgengival. Novas formas farmacêuticas devem ser estudadas, no sentido de proporcionar a liberaçäo controlada dos agentes antimicrobianos, mantendo-se níveis elevados da droga por períodos prolongados no interior da bolsa periodontal