Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T00:11:27Z No. of bitstreams: 1 DeboraMichelleGoncalvesDeAmorim_DISSERT.pdf: 1045671 bytes, checksum: 9457f9af138fc5b16cd8f13019d85f5a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-16T22:23:08Z (GMT) No. of bitstreams: 1 DeboraMichelleGoncalvesDeAmorim_DISSERT.pdf: 1045671 bytes, checksum: 9457f9af138fc5b16cd8f13019d85f5a (MD5) / Made available in DSpace on 2017-10-16T22:23:08Z (GMT). No. of bitstreams: 1 DeboraMichelleGoncalvesDeAmorim_DISSERT.pdf: 1045671 bytes, checksum: 9457f9af138fc5b16cd8f13019d85f5a (MD5) 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.

Made available in DSpace on 2014-12-17T14:13:26Z (GMT). No. of bitstreams: 1 EduardoJGS.pdf: 119973 bytes, checksum: dbdb322fee12ba3edd9d72e5446d9c91 (MD5) Previous issue date: 2009-09-23 / The science of Dentistry wishes obtains the ideal solution for the dental plaque chemical control. This research evaluated antimicrobial action capacity in calcium hydroxide and tergentol various solutions starting for the CHD 20, a root canals irrigating solution with a reason of 80% calcium hydroxide saturated solution and 20% tergentol detergent with the aim of evaluate this drug mouth rinse indication with prevention or combat objective for dental caries and periodontal diseases. Antibiogram disks and biofilm tests were accomplished for the microorganisms: Streptococcus mutans, Streptococcus sanguis, Streptococcus sobrinus and Lactobacillus casei. Different reasons of detergent for the calcium hydroxide saturated solution, tergentol and distillated water solution, 0,12% clorhexydine digluconate solution was positive control and distillated water was negative control. The results showed better performance of clorhexydine in relation to calcium hydroxide directing to not accept this (CHD20) as mouth rinse solution / Na busca pela ci?ncia odontol?gica de se chegar ao composto que possa ser considerado o agente ideal para o controle qu?mico do biofilme dental foi idealizado este estudo. Avaliou-se a capacidade antimicrobiana in vitro de diferentes solu??es a base de hidr?xido de c?lcio e tergentol partindo em princ?pio do HCT 20, solu??o irrigadora dos canais radiculares composta por 80% da solu??o saturada de hidr?xido de c?lcio (?gua de cal) e 20% do detergente tergentol buscando verificar sua poss?vel indica??o como solu??o para bochechos, visando preven??o ou combate a doen?as como c?rie dent?ria e doen?a periodontal. No laborat?rio de microbiologia do Departamento de Odontologia da UFRN, foram realizados testes em discos de antibiograma para os microrganismos: Streptococcus mutans, Streptococcus sanguis, Streptococcus sobrinus e Lactobacillus casei. Bem como em bact?rias formadoras de biofilme para os mesmos, ? exce??o do L. casei. Estipulou-se diferentes concentra??es de tergentol para a ?gua de cal, al?m do tergentol em ?gua destilada, usou-se digluconato de clorexidina a 0,12% como controle positivo e ?gua destilada como controle negativo. Os resultados mostraram desempenho inferior das solu??es a base de Ca(OH)2 em rela??o ? clorexidina frente a estes microrganismos e ? metodologia empregada, direcionando pois, para a n?o indica??o do uso do HCT 20 como colut?rio bucal

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-14T19:53:37Z No. of bitstreams: 1 LechWalesaOliveiraSoares_DISSERT.pdf: 2473726 bytes, checksum: d7a80c7eeaba135cb9b0bb6355b7a8c2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-15T23:04:07Z (GMT) No. of bitstreams: 1 LechWalesaOliveiraSoares_DISSERT.pdf: 2473726 bytes, checksum: d7a80c7eeaba135cb9b0bb6355b7a8c2 (MD5) / Made available in DSpace on 2016-06-15T23:04:07Z (GMT). No. of bitstreams: 1 LechWalesaOliveiraSoares_DISSERT.pdf: 2473726 bytes, checksum: d7a80c7eeaba135cb9b0bb6355b7a8c2 (MD5) Previous issue date: 2015-04-10 / A cimenta??o de po?os de petr?leo tem como fun??o b?sica promover a estabilidade mec?nica e selar hidraulicamente o po?o impedindo a comunica??o entre os diferentes tipos de fluidos. Materiais pozol?nicos s?o adicionados ao cimento, pois reagem com o hidr?xido de c?lcio formando silicatos e aluminatos de c?lcio hidratado, melhorando a estabilidade qu?mica dos produtos das fases hidratadas. A utiliza??o da cinza da casca de arroz, um rejeito da agroind?stria, na substitui??o parcial ou em adi??o ao cimento ? uma alternativa sustent?vel, na qual ? poss?vel reduzir os ?ndices de emiss?o de CO2 no processo de fabrica??o do cimento. Nesse trabalho foi avaliada a atividade pozol?nica da cinza da casca de arroz (RHA e WRHA) em pastas de cimento para po?os de petr?leo em adi??es de 10% e 20% com rela??o ? massa de cimento (BWOC). As pastas foram curadas por 28 dias a 38?C. As cinzas foram caracterizadas pelas t?cnicas de Microscopia Eletr?nica de Varredura (MEV), Infravermelho com Transformada de Fourier (FTIR), Energia Dispersiva de Raios X (EDX) e ?rea superficial (BET). A atividade pozol?nica foi avaliada pelas t?cnicas de An?lise Termogravim?trica (TGA), Difra??o de Raios X (DRX) e Resist?ncia ? Compress?o. Os resultados de TGA demonstraram que a adi??o da WRHA promoveu uma redu??o de aproximadamente 73% da fase Portlandita com rela??o ? pasta padr?o. A partir dos resultados de DRX foi poss?vel se evidenciou a redu??o da intensidade dos picos de Portlandita. Com base nos resultados apresentados podemos concluir que a cinza da casca do arroz reagiu quimicamente com a Portlandita produzindo C-S-H confirmando seu efeito como agente pozol?nico. / Pozzolanic materials such as rice husk ash are widely used to substitute part of cement, because they react with calcium hydroxide (CH) producing calcium silicate hydrate (C-S-H), which aggregate better physical, chemical and mechanical properties to the cement slurry. The usage of rice husk biomass ash from agribusiness in addition to or partially replacing cement is a noble purpose and a good way of sustainable development which currently is an obsession around the world. The ashes utilized in this study were characterized by: scanning electron microscopy technique (SEM), Fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX) and BET method. The pozzolanic activity of RHA and WRHA in cement slurries was evaluated by: thermal-gravimetric technique and derivative thermogravimetry (TGA/DTG), X-ray diffraction (XRD) and Compressive Strength. The slurries formulated with additions of 10% and 20% of RHA and WRHA were cured for 28 days at 58 ?C. The results of thermal analysis demonstrated that a 20% WRHA addition caused a reduction of approximately 73% of Portlandite (calcium hydroxide ? CH) phase related to standard slurry (STD). The XRD scans also demonstrated the reduction of the Portlandite peaks? intensity for each slurry compared with STD slurry. The RHA and WRHA react chemically with Portlandite producing calcium silicate hydrate (C-S-H), confirming their effect as a pozzolanic agent. The WRHA presented the best results as a pozzolanic material.