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Previous issue date: 2017-07-18 / Objetivo: Avaliar o impacto da adi??o do hidr?xido de c?lcio ? Ca(OH)2 na neutraliza??o do pH e grau de convers?o de adesivos autocondicionantes experimentais. M?todos: Quatro adesivos foram formulados em dois frascos: Frasco A, contendo UDMA, HEMA, GDMA-P, TPO, DH e solvente; Frasco B: composto por UDMA, HEMA, TPO, DH, solventes. Os solventes utilizados foram etanol e ?gua (1:1). A vari?vel de formula??o testada foi a concentra??o de Ca(OH)2, adicionado ao frasco B, nas fra??es em massa de 0% (controle), 1%, 2% e 4%. Sendo assim, os adesivos foram divididos em quatro grupos (A+B0; A+B1; A+B2; A+B4). Volumes iguais dos frascos A e B de cada adesivo foram misturados e ~5ul dessa mistura foram inseridos em moldes de silicona para confec??o dos discos. Antes da polimeriza??o do adesivo, o pH dos mesmos foi aferido, atrav?s de um pHmetro. Ap?s a fotoativa??o, os discos (n=5) foram imersos em ?gua destilada, e leituras do pH do eluato foram realizadas por 72h. Para avalia??o do grau de convers?o, cinco amostras de cada adesivo foram submetidas ao FTIR, com dispositivo de reflect?ncia total atenuada (ATR), antes e ap?s a fotoativa??o das amostras. Para os procedimentos de fotoativa??o, foi utilizada uma fonte de luz LED de 3? gera??o - Bluephase G2. Os dados foram estatisticamente avaliados por meio dos testes ANOVA 1 fator (grau de convers?o e pH do adesivo) e 2 fatores (pH do eluato) e p?s teste de Tukey (p<0,05). Resultado: No teste de grau de convers?o n?o foi encontrado diferen?a estatisticamente significativa entre os adesivos experimentais testados. O pH dos adesivos experimentais testados foram todos estatisticamente diferentes entre si. O pH do eluato foi neutralizado nos gupos A+B2 e A+B4 ap?s o per?odo de imers?o. Conclus?o: o grau de convers?o n?o foi afetado pela incorpora??o do hidr?xido de c?lcio. O pH do adesivo e do eluato foi neutralizado com a adi??o do hidr?xido de c?lcio. / Purpose: To evaluate the impact of the addition of calcium hydroxide - Ca (OH) 2 on the neutralization of pH and degree of conversion of experimental self - etching adhesives. Methods: Four adhesives were formulated in two flasks: Bottle A, containing UDMA, HEMA, GDMA-P, TPO, DH and solvent; Bottle B: composed of UDMA, HEMA, TPO, DH. The solvents used were ethanol and water (1: 1). The concentration of Ca (OH) 2, added to flask B, in the mass fractions of 0% (control), 1%, 2% and 4% was evaluated, and the adhesives were divided into four groups (A + B0, A + B1, A + B2, A + B4). Equal volumes of bottles A and B of each adhesive were mixed and ~ 5 ? of this mixture was inserted into silicone molds to make the disks. Before polymerization of the adhesive the pH of the adhesive was measured through a pH meter. After the photoactivation, the disks (n = 5) were immersed in distilled water, and pH readings of the eluate were performed for 72h. To evaluate the degree of conversion, five samples of each adhesive were submitted to the FTIR, with attenuated total reflectance (ATR) device, before and after the photoactivation of the samples. For the photoactivation procedures, a 3rd generation LED light source - Bluephase G2 was used. The data were statistically evaluated by ANOVA 1 factor (degree of conversion and pH of the adhesive) and 2 factors (pH of the eluate) and Tukey's post-test (p <0.05). Results: No statistically significant difference was found between the experimental adhesives tested in the conversion test. The pH of the experimental adhesives tested were all statistically different from each other. The pH of the eluate was neutralized in the A + B2 and A + B4 groups after the immersion period. Conclusion: the degree of conversion was not affected by the incorporation of calcium hydroxide. The pH of the adhesive and the eluate was neutralized with the addition of calcium hydroxide.
Keywords: Calcium Hydroxide, Spectroscopy, Fourier Transform Infrared, Dentin-Bonding Agents.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24088 |
| Date | 18 July 2017 |
| Creators | Amorim, D?bora Michelle Gon?alves de |
| Contributors | 01065593465, Dantas, Emanuelle Dayana Vieira, 04672963403, Medeiros, Maria Cristina dos Santos, 41608259404, Borges, Boniek Castillo Dutra, Caldas, Marilia Regalado Galv?o Rabelo |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM SA?DE COLETIVA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/embargoedAccess |
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