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- 저자 : Sampaio-Maia, Benedita (검색결과 2 건)
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Mathematics Learning in an Informal Environment at a Portuguese Kindergaten
( Maia Joao Sampaio ),( Menino Conceicao ) 한국수학교육학회 2011 수학교육 학술지 Vol.2011 No.-
Instead of prepare specific activities for teach mathematical ideas, some kindergarten teachers prefer to promote mathematics knowledge in an informal environment, assuming this is the best way to develop children creativity. In this paper, we present activities where children learn mathematics in non-mathematical situations and use their knowledge to solve their problems in daily kindergarten life. In each situation, children must accomplish some tasks where they have to count and to write their counting. They show what they have learned and they show their creativity using their knowledge in different actions.
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A simple and effective method for addition silicone impression disinfection
Azevedo, Maria Joao,Correia, Ines,Portela, Ana,Sampaio-Maia, Benedita The Korean Academy of Prosthodonitics 2019 The Journal of Advanced Prosthodontics Vol.11 No.3
PURPOSE. Although dental impression disinfection is determinant to reduce the cross-infection risk, some studies have shown that, in real practice, the disinfection procedures vary considerably. Thus, the aim of this study was to evaluate the antimicrobial effectiveness and the impact on the dimensional stability of addition silicone' impressions of water wash and the most clinically used disinfection solutions: 3% hydrogen peroxide, commercial disinfectant MD520 (Durr) and 1% and 5.25% sodium hypochlorite. MATERIALS AND METHODS. For this investigation, dental impressions were taken on 16 volunteer dental students. The antimicrobial effectiveness of each procedure was evaluated by pour plate method. The dimensional stability was evaluated using a standardized stainless-steel model, according to ANSI/ADA nº19 specification. RESULTS. The study results showed that water wash does not alter the dimensional stability of addition silicone impressions but doesn't reduce the microbial load of the material (P>.05). On the other hand, addition silicone disinfection by immersion with 3% hydrogen peroxide, MD520 (Durr), or sodium hypochlorite at 1% and 5.25% does not alter the dimensional stability significantly but reduces > 99.9% of the microbial load of the impressions (P<.001). CONCLUSION. Addition silicone impressions should always be disinfected after water wash in order to reduce effectively the cross-infection risk. All disinfectants tested showed high antimicrobial efficiency without significant changes in three-dimensional shape of impressions. Hydrogen peroxide and sodium hypochlorite are of particular importance because are easily accessible in dental setting. The less explored hydrogen peroxide could be a valuable alternative for silicone impressions disinfection.
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