Submitted by Aline Serrado de Pinho Barcellos null (alinebarcellosodonto@hotmail.com) on 2016-12-18T12:01:55Z No. of bitstreams: 1 dissertaçãoImpressão.pdf: 3771981 bytes, checksum: 5f352cb7c8b67d15d25214beae5fe249 (MD5) / Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-12-20T17:14:58Z (GMT) No. of bitstreams: 1 barcellos_asp_me_sjc.pdf: 3771981 bytes, checksum: 5f352cb7c8b67d15d25214beae5fe249 (MD5) / Made available in DSpace on 2016-12-20T17:14:58Z (GMT). No. of bitstreams: 1 barcellos_asp_me_sjc.pdf: 3771981 bytes, checksum: 5f352cb7c8b67d15d25214beae5fe249 (MD5) Previous issue date: 2016-11-04 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo do estudo foi avaliar o comportamento mecânico de uma cerâmica, à base de dissilicato de lítio, em ensaio de flexão com as extremidades fixas. Este estudo particular tem similaridade com caso real de aplicação de prótese em pacientes, o que melhora a avaliação do material quando comparado a ensaios convecionais como o ensaio de flexão em três pontos, com viga simplesmente apoiada. Para isso os corpos de prova foram submetidos à três tipos de envelhecimento: ciclagem mecânica, ciclagem termomecânica, ambas de acordo com os protocolos utilizados na literatura, e ciclagem intrabucal. A ciclagem intrabucal foi realizada por meio da utilização de um dispositivo intrabucal semelhante a uma placa oclusal, na qual foram instalados os corpos de prova, por meio de um dispositivo metálico próprio. Estas placas foram utilizadas em dez voluntários por oito horas, durante o período noturno. As amostras foram posteriormente submetidas ao ensaio mecânico de flexão de três pontos com as extremidades engastadas, para avaliação da resistência residual. Os resultados de resistência residual foram submetidos à análise estatística descritiva (média e desvio padrão) e inferencial, mediante o teste paramétrico de análise de variância (ANOVA) um fator e o teste de Tukey ( = 0,05). As amostras representativas de cada grupo foram observadas em microscópio eletrônico de varredura para análise fractográfica. O tipo de ciclagem influenciou no comportamento mecânico da cerâmica, apresentando significância estatística (p = 0,000) e o grupo de ciclagem intrabucal mostrou a menor resistência à flexão. A origem da fratura foi na zona de tração, porém observou-se uma origem secundária localizada em zona de torção. Pode-se concluir que os tipos de ciclagens influenciaram no comportamento mecânico da cerâmica de dissilicato de lítio. As ciclagens mecânica, termomecânica e intrabucal reduziram a resistência à flexão do material. A ciclagem intrabucal foi a que mais reduziu a resistência residual em flexão deste tipo de cerâmica. / This study aimed to evaluate the behavior of lithium disilicate ceramic in similar condition to a partial fixed prosthesis of three elements by subjecting to three types of aging (n=10): mechanical cycling, thermomechanical cycling, both according to the protocols used in the literature, and intraoral cycling. The intraoral cycling was accomplished by using an intraoral device, which is similar to an occlusal splint. They were installed with the samples (CP) by means of a metallic device that was fixed in balanced contact condition with the remainder of the occlusal surface of the plate. These plates were used in ten volunteers for eight hours during the evening. After fatigue, the samples were subjected to three-point bending tests with clamped ends to evaluate the residual strength. The residual strength results were submitted to descriptive statistics (mean and standard deviation) and inferential by the parametric analysis of variance (ANOVA), with one factor and Tukey test ( = 0.05). In addition, representative samples of each group were observed in a scanning electron microscope (SEM) for fractographic analysis. The cycling condition influenced the mechanical behavior of ceramic with statistical significance of (p = 0,000), and the intraoral cycling group showed the lowest residual flexural strength. In fractographic analysis, they showed that the origin of fracture was in the tensile zone, but there was a secondary fracture origin represented by a twisted zone. Therefore, all types of cycling influenced the flexural strength of the material.

Syfte Syftet med föreliggande studie är att genom en systematisk översikt identifiera skillnaderna i de kemiska och mekaniska egenskaperna hos materialen PEEK och PEKK och till vilka dentala applikationer materialen kan användas.  Material och metod Materialens kemiska och mekaniska egenskaper identifierades genom litteratursökning med PRISMA och PICO-systemet. Databaserna som användes var PubMed, Scopus samt Web of Science. Granskning gjordes på titel-, abstrakt- och fulltextnivå, baserat på inklusions- och exklusionskriterier. Resultat Sökningen resulterade i totalt 226 artiklar varav 210 artiklar i PubMed, nio artiklar i Scopus och sju artiklar i Web of Science. Efter kontroll av dubbletter och bedömning utifrån inklusions- och exklusionskriterier var det totalt sju artiklar som analyserades på fulltextnivå. Av dessa sju artiklarna utvärderades olika materialegenskaper där de använda materialtesterna skiljde sig åt. I fem artiklar utvärderades bindningsstyrkan mellan fasadmaterial och PEEK och/eller PEKK. En artikel undersökte ytan hos materialen beroende på ytbehandling och en artikel testade tryckhållfasthet på tre-ledsbroar av PEEK och PEKK. Båda materialen uppvisade liknande mekaniska och kemiska egenskaper vid jämförelse mot varandra.  Slutsats PEEK och PEKKs mekaniska och kemiska egenskaper skiljer sig inte åt. Mer forskning och kliniska data behövs om materialens dentala applikationer. Nyckelord: Avtagbar protetik, fast protetik, högpresterande polymer, PAEK, tandvård / Purpose The purpose of the present study is to carry out a systematic review to identify the differences in mechanical and chemical properties of the materials PEEK and PEKK, as well as which  dental applications the materials can be used for.  Material and method The materials’ mechanical and chemical properties were identified using PRISMA and PICO system through a literature search. The databases used were PubMed, Scopus and Web of Science. Screening and assessing were done at title, abstract and full text level, based on the inclusion and exclusion criteria. Results The search resulted in a total of 226 articles, whereon 210 articles in PubMed, nine articles in Scopus and seven articles in Web of Science. After removal of duplicates and assessment of the studies according to the inclusion and exclusion criteria, the total amount of studies reviewed was seven. In these seven articles, different properties were evaluated, and the tests used differed. In five articles, the shear bond strength between veneering materials and PEEK and/or PEKK was tested. In one article the surface roughness depending on surface treatment was tested and in another, the strength of three-unit fixed dental prostheses made of PEEK and PEKK was tested. PEEK and PEKK showed similar mechanical and chemical properties in comparison to each other.  Conclusion The mechanical and chemical properties of PEEK and PEKK do not differ. More research and clinical data are needed on the dental applications of the materials.Keywords: Dentistry, fixed dental prosthesis, high-performance polymer, removable dental prothesis, PAEK.