Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-05-25T14:55:38Z No. of bitstreams: 1 TES_JULIANA_DONCATTO_BETTINELLI_COMPLETO.pdf: 2435463 bytes, checksum: 80f6606ba1ecc5861b22ef0b6b9e87de (MD5) / Made available in DSpace on 2017-05-25T14:55:38Z (GMT). No. of bitstreams: 1 TES_JULIANA_DONCATTO_BETTINELLI_COMPLETO.pdf: 2435463 bytes, checksum: 80f6606ba1ecc5861b22ef0b6b9e87de (MD5) Previous issue date: 2017-01-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Since the 1970s, the application of the CAD / CAM technique has been suggested in the dental clinic with the aim of simplifying, automating and guaranteeing quality levels with micrometric adaptations of our dental prostheses4,5. The objective of this study was to evaluate the viability of the diode laser as an alternative to hydrofluoric acid and aluminum oxide blasting compared to the machining process in the surface treatment of the following restorative materials: hybrid ceramics, nanoceramic resin, reinforced lithium silicate ceramics by zirconia, feldspathic ceramics, vitreous ceramics with crystalline structure of lithium disilicate, vitreous ceramics with crystalline structure of leucite. A specimen was prepared for each of the seven CAD / CAM restorative materials; And, this was divided into four parts. The dimensions of the specimens were 1cm in length and 1cm in width, in the thickness of 1mm, color A2. The surface area of the specimen was subdivided into quadrants; (A) was applied to the diode laser, (B) received the blasting of aluminum oxide, (C) received the application of hydrofluoric acid (5 or 10%) or cleaning with isopropyl alcohol (10%); As indicated by the manufacturer, (D) no conditioning was applied and the surface passed through the machining process only. Images were taken at a 15,000- fold increase (SEM). For the surface roughness test, ten measurements were taken, with cut-off 0.25. Statistical data were submitted to ANOVA and Tukey's test. Knowing the need to seek new alternatives of a conditioning protocol on the surface of restorative materials in CAD / CAM, it was highly effective, fast, simplified and mainly safe. It can be stated that the use of the diode laser seems to be feasible for the surface treatment of ceramic with crystalline structure of lecithin Empress CAD and ceramic feldspathic Cerec Blocs CAD / CAM, as it produced changes in the surface of these ceramics studied. / Desde a d?cada de setenta, a aplica??o da t?cnica CAD/CAM vem sendo sugerida na cl?nica odontol?gica com o objetivo de simplificar, automatizar e garantir n?veis de qualidade com adapta??es microm?tricas das nossas pr?teses dent?rias4,5. O objetivo deste estudo foi avaliar a viabilidade do laser de diodo, como alternativa ao ?cido fluor?drico e jateamento com ?xido de alum?nio em compara??o ao processo de usinagem no tratamento superficial dos seguintes materiais restauradores: cer?mica h?brida, resina nanocer?mica, cer?mica de silicato de l?tio refor?ada por zirc?nia, cer?mica feldsp?tica, cer?mica v?trea com estrutura cristalina de dissilicato de l?tio, cer?mica v?trea com estrutura cristalina de leucita. Foi confeccionado um corpo de prova para cada um dos sete materiais restauradores em CAD/CAM; e, este foi dividido em quatro partes. As dimens?es dos corpos de prova foram de 1 cm de comprimento por 1cm de largura, na espessura de 1mm, cor A2. A ?rea de superf?cie do corpo-de-prova foi subdivida em quadrantes; de forma que em (A) foi aplicado o laser de diodo, (B) recebeu o jateamento de ?xido de alum?nio, (C) recebeu a aplica??o de ?cido fluor?drico (5 ou 10%) ou limpeza com ?lcool isoprop?lico (10%); conforme indica??o do fabricante, (D) n?o foi aplicado condicionamento e a superf?cie passou apenas pelo processo de usinagem. Foram realizadas imagens no aumento de 15.000 vezes (MEV). Para o teste de rugosidade superficial, foram tomadas dez medidas, com cut-off (valor de corte) 0,25. Os dados estat?sticos obtidos foram submetidos ? ANOVA e ao teste de Tukey. Sabendo-se da necessidade de buscar novas alternativas de um protocolo de condicionamento na superf?cie dos materiais restauradores em CAD/CAM, que fosse altamente eficaz, r?pido, simplificado e principalmente seguro. Pode-se afirmar que a utiliza??o do laser de diodo parece ser vi?vel para o tratamento superficial da cer?mica v?trea com estrutura cristalina de leucita Empress CAD e cer?mica feldsp?tica Cerec Blocs CAD/CAM, pois produziu altera??es na superf?cie destas cer?micas estudadas.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T19:01:21Z No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-28T21:34:07Z (GMT) No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) / Made available in DSpace on 2016-01-28T21:34:07Z (GMT). No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) Previous issue date: 2015-01-09 / O presente trabalho teve como objetivo analisar a resposta biol?gica em superf?cies de tit?nio modificadas por plasma de Ar+N2+H2. Discos de tit?nio grau II receberam diferentes tratamentos de superf?cie com plasma de Ar+N2+H2, constituindo sete grupos experimentais incluindo amostras apenas polidas utilizadas como padr?o. Antes e ap?s o tratamento as amostras foram caracterizadas quanto ? topografia, estrutura cristalina e molhabilidade, usando microscopia de for?a at?mica, difra??o de raios-X, espectroscopia Raman e ensaio da gota s?ssil, respectivamente. Plasma sangu?neo rico em plaquetas (PRP) foi aplicado sobre as superf?cies modificadas em placas de cultivo. Imagens obtidas por microscopia eletr?nica das plaquetas aderidas foram analisadas a fim de verificar o comportamento das plaquetas nas diferentes condi??es experimentais. Verificou-se que a adi??o de H2 na atmosfera do plasma resultou em superf?cies mais rugosas, com picos arredondados. Essas superf?cies, ao contr?rio daquelas tratadas com atmosfera de alta concentra??o de N2, s?o menos propensas ? agrega??o plaquet?ria e, consequentemente, ? forma??o de trombos quando aplicadas em dispositivos biom?dicos. / This study aimed to analyze the biological response of titanium surfaces modified by plasma Ar + N2 + H2. Titanium disks grade II received different surface treatments Ar + N2 + H2 plasma, constituting seven groups including only polished samples used as standard. Before and after treatment the samples were evaluated in terms of topography, crystal structure and wettability, using atomic force microscopy, X-ray diffraction, Raman spectroscopy and testing of the sessile drop, respectively. Rich plasma (PRP) was applied to the surfaces modified in culture plates. Images obtained by scanning electron microscopy of the adhered platelets were analyzed to verify the behavior of platelets in the different experimental conditions. We verified that the adition of H2 on plasma atmosphere resulted in more rough surfaces, with round tops. These surfaces, in contrast to that surfaces treated with high concentration of N2, are less propense to platelet aggregation and, consequently, to the formation of thrombus when applied in biomedical devices.