Effect of thermal cycling on denture base and autopolymerizing reline resins.

OBJECTIVE: This study evaluated the fracture toughness (FT) of denture base and autopolymerizing reline resins, with and without thermocycling (T). MATERIAL AND METHODS: Specimens of each material (denture base acrylic resin - Lucitone 550 - L; autopolymerizing reline resins - Ufi Gel Hard-UH, Tokuyama Rebase II-TR, New Truliner-NT and Kooliner-K), were produced, notched and divided into two groups (n=10): CG (control group of autopolymerizing reline resins and L): FT tests were performed after polymerization; TG (thermocycled group): FT tests were performed after T (5°C and 55°C for 5,000 cycles). RESULTS: Results (MPa.m1/2) were analyzed by two-way ANOVA and Tukey's test (p=0.05). L exhibited the highest FT mean values in both groups (CG - 2.33; TG - 2.17). For the CG groups, NT showed the highest FT (1.64) among the autopolymerizing reline resins, and K the lowest (1.04). After T, when the autopolymerizing reline resins were compared, a statistically significant difference in FT was found only between the NT (1.46) and TR (1.00). CONCLUSIONS: Thermocycling increased the FT of K and did not influence the FT of L, UH, TR and NT.

Effect of thermal cycling on denture base and autopolymerizing reline resins

Objective This study evaluated the fracture toughness (FT) of denture base and autopolymerizing reline resins, with and without thermocycling (T). Material and Methods Specimens of each material (denture base acrylic resin - Lucitone 550 – L; autopolymerizing reline resins - Ufi Gel Hard–UH, Tokuyama Rebase II-TR, New Truliner–NT and Kooliner-K), were produced, notched and divided into two groups (n=10): CG (control group of autopolymerizing reline resins and L): FT tests were performed after polymerization; TG (thermocycled group): FT tests were performed after T (5°C and 55°C for 5,000 cycles). Results: Results (MPa.m1/2) were analyzed by two-way ANOVA and Tukey's test (p=0.05). L exhibited the highest FT mean values in both groups (CG - 2.33; TG - 2.17). For the CG groups, NT showed the highest FT (1.64) among the autopolymerizing reline resins, and K the lowest (1.04). After T, when the autopolymerizing reline resins were compared, a statistically significant difference in FT was found only between the NT (1.46) and TR (1.00). Conclusions Thermocycling increased the FT of K and did not influence the FT of L, UH, TR and NT. .

Qualidade e conservação do morango armazenado em atmosfera modificada / Quality and conservation of the strawberry stored in modified atmosphere

Este trabalho teve como objetivo avaliar a qualidade e a conservação de morangos armazenados sob atmosfera modificada. Foram utilizados morangos Oso Grande, produzidos na cidade de Botucatu-SP e colhidos no estádio de maturação três / quarto vermelho. O experimento constituiu-se no armazenamento das frutas em embalagens de polietileno sob diferentes misturas gasosas: testemunha; vácuo parcial; 5 por cento O2 (...). Os parâmetros analisados foram: aparência, vida útil, incidência de doenças, teor de sólidos solúveis, acidez titulável, vitamina C e firmeza. Para avaliação da conservação pós-colheita, os frutos foram armazenados a O graus C +/- 1 graus C / 90+/- 5por cento UR por 12 dias e avaliados a cada dois dias.(...) Os resultados obtidos permitem concluir que as frutas do tratamento testemunha apresentaram maior vida útil a maior qualidade.

Qualidade e conservação do morango armazenado em atmosfera modificada / Quality and conservation of the strawberry stored in modified atmosphere

Este trabalho teve como objetivo avaliar a qualidade e a conservação de morangos armazenados sob atmosfera modificada. Foram utilizados morangos Oso Grande, produzidos na cidade de Botucatu-SP e colhidos no estádio de maturação três / quarto vermelho. O experimento constituiu-se no armazenamento das frutas em embalagens de polietileno sob diferentes misturas gasosas: testemunha; vácuo parcial; 5 por cento O2 (...). Os parâmetros analisados foram: aparência, vida útil, incidência de doenças, teor de sólidos solúveis, acidez titulável, vitamina C e firmeza. Para avaliação da conservação pós-colheita, os frutos foram armazenados a O graus C +/- 1 graus C / 90+/- 5 por cento UR por 12 dias e avaliados a cada dois dias. O delineamento estatística adotado foi o inteiramente casualizado, comparando as médias pelo teste de Turkey a 5% de probabilidade. Os resultados obtidos permitem concluir que as frutas do tratamento testemunha apresentaram maior vida útil a maior qualidade.(AU)

The objective of this work evaluate has quality and conservation of strawberries in modified atmosphere. Was conducted with strawberries 'Oso Grande', produced in the city of Botucatu-SP/Brazil and picked in the maturation stage red 3/4. The experiment consisted of the storage of the fruits in polyethylene packing under different gaseous mixtures: control; vacuous; 5% 02 and 1% CO2; 5% 02 and 3% CO2; 5% 02 and 5% CO2. The analyzed parameters were: appearance, shelf life, incidence of disease, soluble solids, titratable acidity, vitamin C and firmness. For evaluation of the post-harvest conservation the fruits were stored 0° C +/- 10 C/ 90 +/- 5% UR for 12 days and appraised every 2 days. The statistical layout was completely randomized, by comparing the means with Tukey test in a ratio of 5% probability. The results obtained indicate that the treated fruits have a larger shelf life end more quality. (AU)

Conservação do morango armazenado em atmosfera modificada / Strawberries storage conservation in modified atmosphere

Este trabalho teve como objetivo avaliar a qualidade e a conservação de morangos armazenados sob atmosfera modificada. Foram utilizados morangos "Oso Grande", produzidos na cidade de Botucatu-SP e colhidos no estágio de maturação 3/4 vermelho. O experimento constituiu no armazenamento das frutas em embalagens de polietileno sob diferentes misturas gasosas: testemunha; vácuo parcial; 5 O2 e 1 CO2; 5 O2 e 3 CO2; 5 O2 e 5 CO2. Os parâmetros analisados foram: aparência, vida útil, incidência de doenças, teor de sólidos solúveis, acidez titulável, vitamina C e firmeza. Para a avaliação da conservação pós-colheita, os frutos foram armazenados a 0°C +/- 1°C/90+/-5 UR por 12 dias e avaliados a cada dois dias. O delineamento estatístico adotado foi o inteiramente casualizado, comparando as médias pelo teste de Tukey a 5 de probabilidade. Os resultados obtidos permitem concluir que as frutas do tratamento testemunha não apresentaram diferenças estatísticas dos demais tratamentos exceto o de vácuo parcial

The objective of this work was to evaluate the quality and conservation of strawberries in modifiedatmosphere. 'Oso Grande' strawberries, produced in Botucatu-SP-Brazil, and picked in the ¾ red maturationstages were used. The experiment consisted in the storage of the fruits in polyethylene packages underdifferent gaseous mixtures: control; vacuous; 5% O2 and 1% CO2; 5% O2 and 3% CO2; 5% O2 and 5% CO2.The analyzed parameters were: appearance, shelf life, incidence of disease, soluble solids, titratableacidity, vitamin C and firmness. For evaluation of the post-harvest conservation the fruits were stored in0o C +/- 1o C / 90 +/- 5% UR ambient for 12 days and appraised every 2 days. The statistical layout wascompletely randomized, by comparing the means with Tukey test in a ratio of 5% probability. Theobtained results allow to conclude that the fruits of the treatment testify didn't present statisticaldifferences of the other treatments except the one of vacuous partial