Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-04-07T12:52:15Z No. of bitstreams: 1 2014 - Carlos Henrique Rocha Gon?alves.pdf: 2447515 bytes, checksum: bcb566dd037e0d15e3e3ab74112d585e (MD5) / Made available in DSpace on 2017-04-07T12:52:15Z (GMT). No. of bitstreams: 1 2014 - Carlos Henrique Rocha Gon?alves.pdf: 2447515 bytes, checksum: bcb566dd037e0d15e3e3ab74112d585e (MD5) Previous issue date: 2014-02-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This work aimed to realize oxidative reactions using ozone in aqueous middle to simulate the aging aspect in Corymbia citriodora K.D. Hill & L.A.S. Johnson wood samples. Ozone that is a very reactive gas, was produced by the ozonizer by the corona effect. In order to evaluate the transformations occurred in the samples submitted to the treatment in different times and pHs (neutral, basic and acid) those samples were analyzed by various tests (color mensuration in the CIELAB colorimetric space; contact angle between water and wood by the goniometer; XPS spectroscopy and Pyrolysis ? GC/MS). The samples were obtained from a Corymbia citriodora tree log harvested in the UFRRJ campus in Serop?dica. Those samples were treated mechanically in order to adequate it to the analysis with 10 x 20 x 2 mm dimensions. It was observed that the 6h acid was the one that presented the best natural aging appearance. All the tests done have shown that the wood components had different behaviors in each treatment, especially when we talk about lignin and its G/S (Guaiacyl:Siringyl). The results have shown that the reactions were well succeed, revealing that the ozone had reacted in the majority of the samples, with the lignin, affecting the G/S ratio for all the treatments. XPS data showed the level of oxidation, for example, in the neutral treatment, showing ozone oxidative effect. In this way, the G/S ratio revealed that the ozone attack have occurred, first with the lignins that have predominantly the guaiacyl units, assuming that the reaction affected mainly the cellular region with high guaiacyl units content. It was also detected in the acid treatment, that the ozone as well reached the extractives group, especially the decanoic acids. All the experimentations were sufficient to discolor and give aging appearance to the wood, as the color changing shown by the color tests with the spectrophotometer. The contact angle has proved that the samples in order absorb more water, becoming more hydrophilic, when related to the L:C ratio (lignin:carbohydrate). / Esse trabalho teve por objetivo realizar rea??es oxidativas utilizando oz?nio em meio aquoso para simular o aspecto de envelhecimento em madeiras de Corymbia citriodora K.D. Hill & L.A.S. Johnson. O oz?nio que ? um g?s extremamente reativo foi produzido pelo ozonizador atrav?s da descarga corona. Para avaliar as modifica??es ocorridas nas amostras ap?s serem submetidas ?s rea??es de ozon?lise em diferentes tempos e pHs (neutro, b?sico e ?cido), essas amostras foram posteriormente submetidas a v?rios testes (mensura??o da cor no espa?o colorim?trico CIELAB; do ?ngulo de contato entre a ?gua e a madeira atrav?s do goni?metro; espectroscopia XPS (Espectroscopia Fotoeletr?nica de Raios-X) e pir?lise ? CG/EM (pir?lise analisada por cromatografia gasosa, acoplada ? um detector de massa)). As amostras foram obtidas de tora de madeira de um esp?cime da esp?cie Corymbia citriodora obtida no campus da UFRRJ em Serop?dica. Essas amostras foram tratadas mecanicamente de maneira a adequ?-la para an?lise, ficando com dimens?o de 10 x 20 x 2 mm. Foi constatado que as amostras do tratamento ?cido durante 6h foram as que ficaram com a apar?ncia mais pr?xima de uma madeira naturalmente envelhecida. Os diversos testes feitos mostraram que os componentes da madeira se comportaram de forma diferente em cada um dos tratamentos especialmente no que tange ? lignina na sua raz?o G/S da mesma. Os resultados mostraram que a rea??es foram bem sucedidas, revelando que o oz?nio reagiu na grande maioria das amostras com a lignina afetando a raz?o G/S para todos os tratamentos. Dados do XPS mostram os n?veis de oxida??o por exemplo dos tratamentos neutros, mostrando o efeito oxidativo do oz?nio. Neste sentido, a raz?o Guacila/Siringila revelou que o ataque do oz?nio aconteceu primeiramente com as ligninas que predominam unidades guaiacila, pressupondo que a rea??o afetou direcionadamente a regi?o da parede celular com mais alto teor de unidade Guaiac?la. Foi tamb?m detectado no tratamento ?cido que o oz?nio atingiu tamb?m o grupo dos extrativos especialmente os ?cidos decan?icos. Todos os experimentos foram suficientes para descolorir e dar apar?ncia de madeira envelhecida, como mudan?as de cor mostradas pelos testes de cor com espectrofot?metro. O ?ngulo de contato mostrou que as amostras em ordem absorvem mais ?gua, tornando-as mais hidrof?lica, quando correlacionada ? raz?o C:L (Carboidratos:Lignina).

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T00:11:27Z No. of bitstreams: 1 EvelynnCrhistyannMedeirosDuarte_DISSERT.pdf: 1388425 bytes, checksum: 5ce8cc76909bd2c3c96aa372a91fc685 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-16T22:38:23Z (GMT) No. of bitstreams: 1 EvelynnCrhistyannMedeirosDuarte_DISSERT.pdf: 1388425 bytes, checksum: 5ce8cc76909bd2c3c96aa372a91fc685 (MD5) / Made available in DSpace on 2017-10-16T22:38:23Z (GMT). No. of bitstreams: 1 EvelynnCrhistyannMedeirosDuarte_DISSERT.pdf: 1388425 bytes, checksum: 5ce8cc76909bd2c3c96aa372a91fc685 (MD5) Previous issue date: 2017-07-19 / A t?cnica de revasculariza??o pulpar possibilita a reativa??o da forma??o radicular, mas clinicamente observa-se a descolora??o coron?ria. Desta forma, o presente estudo objetivou analisar em qual ou quais etapas desse tratamento ocorre a mudan?a de colora??o. Trata-se de um estudo experimental in vitro, no qual foram utilizados 75 incisivos bovinos (n=15), divididos em 5 grupos: GP- protocolo completo, GA- pasta tripla antibi?tica, GS- sangue, GW- WMTA e GC- soro (controle). A avalia??o da cor foi realizada com o aparelho Easyshade?, atrav?s dos par?metros do CIE-L*a*b*. As leituras foram executadas em triplicata para cada amostra e realizadas antes e ap?s a primeira sess?o, com 24, 48, 72 horas, antes e ap?s a segunda sess?o, com 24, 48, 72 horas, um m?s e tr?s meses ap?s a realiza??o do protocolo. Para a an?lise estat?stica foi utilizado o teste de an?lise de vari?ncia Split-plot, tendo o valor m?dio em todos os grupos sofrido ajustes de Bonferroni, com n?vel de signific?ncia de 95%. Para an?lise intergrupo e intragrupo, foram feitas as compara??es estat?sticas pelo teste ANOVA com o Post Hoc de Tukey. De acordo com a compara??o multivariada, considerando a m?dia total do grau de escurecimento, os grupos sangue e protocolo apresentaram maior grau de escurecimento (p<0,05). Na an?lise intergrupos, o grupo contendo sangue apresentou aumento no grau de escurecimento a partir de 15 dias at? tr?s meses (p<0,05) e o grupo protocolo apresentou descolora??o coron?ria no primeiro e terceiro m?s em rela??o aos demais grupos (p<0,05). Na an?lise intragrupos, os grupos antibi?tico e WMTA apresentaram uma diminui??o no grau de escurecimento com 15 dias em rela??o ao baseline (p<0,05) e posteriormente mantiveram-se est?veis, o grupo contendo sangue ap?s 15 dias teve um aumento (p<0,05) e o grupo protocolo demonstrou uma descolora??o coron?ria ap?s a coloca??o do sangue e do WMTA no conduto, apresentando diferen?a do baseline no terceiro m?s (p<0,01). Assim, concluiu-se que sangue ? o principal causador do escurecimento dent?rio na t?cnica de revasculariza??o pulpar, presente no momento da indu??o do co?gulo. / The pulp revascularization technique allows the reactivation of the root formation, however clinically the coronary discoloration it?s noted. So, the present study aimed to analyze in which stage or stages of this treatment the color change occurs. It is an experimental in vitro study where 75 bovine incisors (n=15), divided in 5 groups: GP- complete protocol, GA- triple antibiotic paste, GS- blood, GW- WMTA, GC- serum (control). The color evaluation was performed with the Easyshade? device, with the CIE-L*a*b* parameters. And the readings were performed in triplicate for each group, before and after the first session, after 24, 48 and 72 hours, one and three months after the protocol exexution. The Statistical analysis was performed using the split-plot analysis of variance test, and the average value in all groups was adjusted by Bonferroni, with a significance level of 95%. For intergroup and intragroup analysis, the statistical comparisons were made through the ANOVA test with the Tukey Post Hoc. According to the multivariate comparison, considering the total average of the degree of darkening, the blood and protocol groups presented more significant darkening (p<0.05). In the intergroup analysis, the group containing blood presented a higher darkening degree from 15 days to three months (p<0,05) and the protocol group presented coronary discoloration on the first and third months in relation to the other groups (p<0,05). In the intragroup analysis, the antibiotic and WMTA groups presented a decrease on the darkening in 15 days compared to the baseline (p<0,05) and then remained stable, the group containing blood had an increase after 15 days (p<0,05) and the protocol group, in 15 days showed coronary discoloration after the introduction of blood on the root canal, showing variation to the baseline on the third month (p<0,01). So, it was concluded that the blood, present on the induction of the clot, is the main cause of dental darkening on the pulp revascularization technique execution.