In the last years, the increase in the need of higher accuracy in science, research and technology in precision engineering created an obligation to produce a new torque standard machine for precise measurement of torque. This thesis deals with the design and implementation of a Counter Torque Device which will be used in a new Torque Standard Machine based on moving mass developed in the faculty of precision engineering at the TU Ilmenau. This new Torque Standard Machine must have a measuring range from 1 mNm to 1 Nm and a lower relative uncertainty Ur :S 1x1O-5 (k = 2). In order to achieve this aim, the fundamentals and the state of the art are shown at the beginning of the thesis. After the specific requirements are compiled in a requirements list, then based on physical and technical principles different possible solutions are developed and evaluated, from this evaluation optimal solution is founded, implemented and tested. / Tesis

Orientador: Fábio Mícolis de Azevedo / Banca: Ruben de Faria Negrão Filho / Banca: Fernando Amancio Aragão / Resumo: A Dor Femoropatelar (DFP) acomete com maior frequência mulheres e é exacerbada ao executar atividades com suporte de peso associada a flexão do joelho, tais como subida de escada. Apesar da etiologia permanecer indefinida, diversos fatores são atribuídos ao desenvolvimento da DFP, dentre os quais destaca-se a diminuição do torque dos músculos do joelho e quadril. Entretanto, os tratamentos que visam o fortalecimento dessa musculatura nem sempre apresentam resultados eficazes a longo prazo. Dessa forma, outros importantes aspectos da função muscular podem estar sendo negligenciados e necessitam ser investigados, tais como a estabilidade do torque e a taxa de desenvolvimento do torque (potência muscular). Diante disso, os objetivos gerais desta dissertação foram investigar a estabilidade do torque, taxa de desenvolvimento do torque e torque máximo dos músculos extensores de joelho e abdutores de quadril em mulheres com DFP, além de determinar a influência do torque muscular do quadril e da cinemática do retropé no padrão de movimento durante atividade funcional de subida de escada. A mensuração das variáveis de torque foi realizada através de dinamômetro isocinético. Já a análise cinemática foi realizada durante subida de escada em um set up experimental composto por 9 câmeras infravermelho para captação de ângulos articulares do quadril e retropé. Observou-se que mulheres com DFP apresentam diminuição da estabilidade do torque, taxa de desenvolvimento do torque e torque máximo... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Patellofemoral pain is more likely to affect women. Pain is exacerbated by activities that load the patellofemoral joint during weight bearing on a flexed knee, such as stair ascent. Despite the source of pain remains unclear, multiple factors have been proposed to explain the development of PFP, especially the impairment in knee and hip maximal strength. However, unfavorable recovery has been reported even after treatments focused on quadriceps and hip strengthening. Thus, other aspects of muscular function are possibly being neglected and should be better explored in PFP, such as force steadiness and rate of force development (muscle power). Therefore, the aims of this dissertation were to compare force steadiness, rate of force development and maximal strength of the knee extensors and hip abductors between women with PFP and pain-free controls and to investigate the influence of hip muscle strength and rearfoot kinematics on the movement pattern during stair ascent in women with PFP. Strength parameters were assessed using an isokinetic dynamometer. Kinematic analysis was performed during stair ascent tasks in an experimental set up composed by 9 cameras for acquisition of hip and rearfoot eversion joint angles. Women with PFP presented deficits in force steadiness, rate of force development and maximal strength of knee extensors and hip abductors compared with pain-free controls. Also, hip abductor strength explained significantly the variance of peak hip internal rotati... (Complete abstract click electronic access below) / Mestre

In this dissertation harmonic current, harmonic torque originated at the load and harmonic torque originated at the motor, where modeled and treated via closed loop control. The dissertation propose a remedy for cancelling harmonic current by placing the proposed adaptive feedforward controller (AFC) in parallel with the FOC current control. Similarly, harmonic torque load was cancelled by proposing an AFC in parallel with the speed control loop. Harmonic torque originated in the motor mainly due to harmonic flux where cancelled through the estimation of harmonic flux, which was achieved by a novel Minimal Parameter Harmonic Flux Estimator (MPHFE). The latter is formulated such that the inductance, resistance, and stator current and its derivative are not necessary for the estimation of the harmonic eflux. This was achieved by forcing the harmonic current induced by the harmonic flux component to zero through the combined action of a Field-Oriented Controller (FOC) and a feed-forward controller. Subsequently, the harmonic flux can be obtained directly from the estimated harmonic back-EMF without the involvement of other motor parameters. Finally, the estimated flux is used in conjunction with a comprehensive analysis of the motor harmonic torque to determine the stator current compensation to eliminate the torque harmonic. A systematic approach to assign the parameter of the AFC controller were developed in this dissertation. Furthermore, multiple experiments were conducted to demonstrate the efficacy of the proposed control schemes harmonics.

Made available in DSpace on 2016-02-05T18:30:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-10-02. Added 1 bitstream(s) on 2016-02-05T18:33:59Z : No. of bitstreams: 1 000857444.pdf: 2079715 bytes, checksum: 40ce0ce70baba1071330eeb4eb0637ed (MD5) / Abstract The purpose of this study was to compare kinematic and neuromuscular parameters of roundhouse (RK) kick in athletes of two different standards. 7 elite and 7 sub-elite black belt taekwondo athletes performed eighteen RK, directed to two randomized height (9 to the head and 9 to the chest), with their dominant lower limb, combining maximum impact and speed, in a selective reaction time design. Angular and linear velocities of dominant leg and pelvis were recorded through 3D kinemetry. Ground reaction force parameters (GRF) were evaluated by force platform and surface electromyographic (sEMG) signals were recorded through wireless system from the Vastus Lateralis (VL), Biceps Femoris (BF), Rectus Femoris (RF), Tensor Fasciae Lata (TFL), Adductor Magnum (AM), Gluteus Maximum (GM), Gluteus Medium (Gmed) and Gastrocnemius Lateralis (GL) muscles of the kicking leg. EMGs data were rectified, filtered and normalized to the maximal value obtained for each muscle over all trials; cocontraction (CI) indexes of antagonist vs. overall (agonist and antagonist) activity were computed for hip abduction and hip and knee in flexion and extension. Premotor time of each muscle, reaction time and kicking time was assessed as well. Timing parameters and sEMG cocontraction index were significantly lower in elite group, while peak of linear (toe, ankle and knee), angular velocities (knee and hip), and GRF were significantly higher in elite than in sub-elite group. We conclude that reaction time, cocontraction, duration and velocity of kick could be useful in selecting top level taekwondo athletes and monitoring their training status

Made available in DSpace on 2015-05-14T16:52:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-02-05Bitstream added on 2015-05-14T16:59:43Z : No. of bitstreams: 1 000823519.pdf: 1163650 bytes, checksum: 6a6b282537180871c220d3444fdfb808 (MD5) / Objetivo: Avaliar os valores de torque reverso RT(%) de parafusos protéticos de liga de titânio recobertos com um filme de carbono amorfo tipo diamante (DLC) e filme dopado com partículas de diamante(CD-DLC) comparando-os com parafusos sem tratamento (controle). Método: Foram utilizados 60 implantes de plataforma regular, divididos de acordo com o tipo de conexão (hexágono externo e hexágono interno) e o tratamento do parafuso protético (n=10): Grupo A1: hexágono externo/parafuso controle; Grupo A2: hexágono externo/parafuso com DLC; Grupo A3: hexágono externo/parafuso com CD-DLC; Grupo B1: hexágono interno/parafuso controle; Grupo B2: hexágono interno/parafuso com DLC; Grupo B3: hexágono interno/parafuso com CD-DLC. Os filmes de DLC e CD-DLC foram depositados pelo processo conhecido como PECVD (Plasma Enhanced Chemical Vapour Deposition). Os implantes foram inseridos em blocos de poliuretano e as coroas protéticas cimentadas sobre os pilares que foram parafusados aos implantes. O torque reverso foi mensurado após ciclagem mecânica (1.106 ciclos). A análise estatística foi realizada pelo teste Anova 1 fator e Teste de Tukey e Teste t-student com nível de significância de 5%. Resultados: A análise dos resultados mostraram que após a ciclagem mecânica o torque reverso RT(%) do grupo sem tratamento (A1) foi significativamente maior que a dos grupos DLC (A2) e CD-DLC (A3) (p=0,0001), para os parafusos das conexões HE. Entretanto não houve diferença estatística entre os grupos com e sem tratamento na manutenção do torque para os parafusos dos grupos de conexão HI (p= 0.5476). Conclusão: Nas condições estudadas, concluiu-se que os parafusos revestidos com filmes DLC não foram efetivos na manutenção do torque reverso em relação aos parafusos sem tratamento para ambas... / Objective: To evaluate the values of reverse torque RT ( % ) of prosthetic screws titanium alloy coated with a film of diamond-like carbon (DLC) and DLC film doped with diamond particles (CD- DLC) comparing them with screws without treatment (control). Method: Sixty implants were divided into six groups according to the type of connection (external or internal hex) and type of abutment screw (n = 10 ): Group A1: external hexagon / screw control , Group A2: external hexagon / screw with DLC; group A3: external hexagon / screw with CD- DLC; group B1: internal hex / screw control; group B2: internal hex / screw with DLC; group B3: internal hex / screw with CD- DLC. The DLC films and CD - DLC were deposited by PECVD process (Plasma Enhanced Chemical Vapour Deposition). The implants were inserted into polyurethane resin, and crowns of nickel chrome cast were cimented and the abutments screwed into the implants. The reverse torque was measured after the mechanical cycling (1.106 cycles). Statistical analysis was performed by one factor ANOVA and Tukey's test, with significance level of 5%. Analysis was performed screws through scanning electron microscopy (SEM) before and after loading . Results: The results showed that after mechanical reverse torque RT (%) for the untreated group (A1) was significantly higher than the one of the DLC groups (A2) and CD -DLC (A3) (p = 0.0001). However, there was no statistical difference for the groups with and without coating in maintaining torque for the screws’ internal hex connections (p = 0.5476). Conclusion: After mechanical cycling, the diamond-like carbon with and without doping of diamond on the screws for abutments, showed no improvement in maintaining the torque in external and internal hex connections...

Made available in DSpace on 2015-06-17T19:34:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-08-07. Added 1 bitstream(s) on 2015-06-18T12:48:55Z : No. of bitstreams: 1 000826366.pdf: 2139319 bytes, checksum: 7c1587e5da8c47a208fed4769c228802 (MD5) / O estudo avaliou o efeito da aplicação de dois filmes de Carbono tipo Diamante por plasma no torque reverso dos pilares protéticos submetidos à ciclagem mecânica e analisou a adaptação do pilar e de suas roscas em relação ao implante, bem como a deformação gerada nas roscas dos pilares e nas roscas internas dos implantes. Para tal, foram utilizados 60 conjuntos de implantes de conexão cônica interna (CCI) de 11º e 8º e pilares de corpo único de titânio que foram divididos em seis grupos (n=10): GC-8 (controle) - CCI 8º sem tratamento; DLC-8 - CCI 8º com aplicação de filme de carbono tipo diamante (DLC); AgDLC-8 - CCI 8º com aplicação de filme de carbono tipo diamante dopado com nano partículas de prata (AgDLC); GC-11 (controle) - CCI 11º sem tratamento; DLC-11 - CCI 11º com aplicação de filme de carbono tipo diamante (DLC); AgDLC-11 - CCI 11º com aplicação de filme de carbono tipo diamante dopado com nano partículas de prata (AgDLC). Os filmes foram depositados por meio do processo de Deposição Química a Vapor Assistida por Plasma (PECVD). Os pilares receberam o aperto controlado por um dispositivo de controle de torque digital seguindo as recomendações do fabricante. O teste de fadiga foi conduzido seguindo os parâmetros especificados na norma ISO 14801 com uma carga de 120 Ncm a 2 Hz por 2 x 106 ciclos. Ao final dos ciclos, o valor de destorque dos pilares foi registrado. Análises por Microscopia Eletrônica de Varredura (MEV) foram realizadas em três amostras de cada grupo, antes e após a ciclagem mecânica, para verificar se a adaptação do pilar (corpo e roscas) ao implante foi afetada pela aplicação dos filmes. A caracterização dos filmes foi realizada por meio de análises Tribológicas, bem como por Espectroscopia Raman e Espectrometria de Energia Dispersiva de Raios-X (EDS). Todos os grupos mostraram redução nos valores de torque reverso. O grupo DLC-8 foi o ùnico a apresentar... / This study evaluated the effect of the plasma deposition of two diamondlike carbon thin films (DLC) on the reverse torque and adaptation of prosthetic abutments after mechanical cycling. Sixty sets of 11º e 8º tapper connection implants (TCI) and titanium solid abutments were divided in six groups (n=10): GC-8 (control) - 8º TCI with no film deposition; DLC-8 - 8º TCI with DLC deposition; AgDLC-8 - 8º TCI with silver doped DLC (AgDLC); GC-11 (control) - 11º TCI with no film deposition; DLC-11 - 11º TCI with DLC deposition; AgDLC-11 -11º TCI with silver doped DLC (AgDLC); The films were deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD) process. The abutments were tightened with a controlled torque meter device following the manufacturer's recommendations. Mechanical cycling was carried out with a load of 120 Ncm during 2 x 106 cycles with a frequency of 2 Hz (ISO 14801). Afterwards, detorque was measured. Analyses with Scanning Electron Microscopy (SEM) were conducted on three samples of each group before and after mechanical cycling in order to verify the adaptation of the abutments (body and threads). Tribology analyses, as well as Raman Spectroscopy and Energy-Dispersive X-rays Spectroscopy (SDS) analyses were performed for characterization of the different surface treatments. All groups demonstrated reduction of reverse torque values. DLC-8 was the only group that showed an increase on the average reverse torque values

Orientador : Prof. Dr. Vera Lúcia Israel / Coorientadora : Profa. Dra. Anna Raquel Silveira Gomes / Dissertaçao (mestrado) - Universidade Federal do Paraná, Setor de Ciencias Biológicas, Programa de Pós-Graduação em Educaçao Física. Defesa: Curitiba, 16/03/2012 / Bibliografia: fls. 52-60 / Área de concentraçao: Exercício e esporte / Resumo: Os sintomas osteomusculares em professores do ensino fundamental são frequentes no Brasil. Para reduzir esta incidência a prática de exercício físico é indicada. O objetivo desse estudo foi avaliar o efeito do treinamento de resistência muscular localizada no torque e nos sintomas osteomusculares relacionados ao trabalho de membros inferiores de professoras do ensino público fundamental. Participaram deste estudo 31 professoras (40±9 anos), divididas em dois grupos: Grupo Treinamento de Resistência (n=16) e Grupo Controle (n=15). O treinamento consistiu em duas séries de 15 repetições de exercícios para quadríceps e isquiotibiais (5 segundos na fase concêntrica e 5 segundos na excêntrica), com intervalo de um minuto entre as séries, 2x/semana, durante sete semanas. Os exercícios foram realizados com 50% de 10 Repetições Máximas (10 RM) da 1a-4a semanas e com 60% de 10 RM da 5a-7a semanas. Os grupos foram avaliados antes e após sete semanas por meio do questionário Nórdico para avaliar os sintomas osteomusculares, da célula de carga para verificar o pico de torque isométrico. O teste de 10 RM foi utilizado para avaliar a força muscular. A análise dos sintomas osteomusculares foi feita por meio do teste Qui-quadrado; comparações entre grupos com o teste Kruskal-Wallis e as correlações entre as variáveis foram feitas por meio do método da correlação de Spearman. A maior incidência de sintomas encontrada foi na região lombar (35±8%) em ambos os grupos. O treinamento de resistência muscular localizada promoveu aumento da força muscular de quadríceps (67%) e de isquiotibiais (53%), entretanto, não influenciou o pico de torque isométrico de quadríceps e isquiotibiais assim como, os sintomas osteomusculares na região lombar e em membros inferiores. Os resultados indicam a necessidade de mais estudos com a finalidade de investigar os efeitos de programas de exercícios de resistência muscular na diminuição dos sintomas osteomusculares relacionados ao trabalho na região lombar e membros inferiores. / Abstract: The musculoskeletal symptoms are recurrent in elementary school teachers in Brazil but the practice of physical exercise could be indicated to reduce them. The objective of this study was to evaluate the effect of localized muscular endurance training in the torque and in the musculoskeletal symptoms of lumbar spine and lower limbs of elementary public school teachers. Thirty-one female teachers (40±9 years-old) were distributed into two groups: Resistance Training Group (n=16) and Control Group (n=15). The Resistance Training Group performed two sets of 15 repetitions of quadriceps and hamstrings (5s concentric and 5s eccentric) resting 1min between the sets, twice a week, during seven consecutive weeks. The exercises were carried out with 50% of 10 repetition maximum (10 RM) from the 1st to 4th week and 60% of 10RM between the 5th and 7th week. The groups were assessed before and after seven weeks with the Nordic questionnaire to evaluate the musculoskeletal symptoms, the load cell to calculate the isometric quadriceps and hamstring peak of torque; The 10 RM test was used to estimate the muscular strength. The musculoskeletal symptoms were compared by Chi-Square, comparisons between groups with the Kruskal-Wallis test and the correlations between the variables were made by Spearman correlation. The highest prevalence of musculoskeletal symptoms was found in the lumbar region (35±8%) in both groups. Localized muscular endurance training promoted increases in quadriceps (67%) and hamstrings (53%) muscular strength, however, these effects did not influence the isometric peak of torque of quadriceps and hamstrings as well as musculoskeletal symptoms of lumbar region and lower limbs. The outcomes indicate the need for further research to investigate the effects of muscular endurance exercises programs in reducing work-related musculoskeletal symptoms of lumbar region and lower limbs.

Made available in DSpace on 2016-06-07T17:12:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-12-10. Added 1 bitstream(s) on 2016-06-07T17:17:17Z : No. of bitstreams: 1 000865436.pdf: 1601189 bytes, checksum: c34e3709b85d75f0d4c7ed707ac9c2a8 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Esta pesquisa se propôs verificar a manutenção do torque, após fadiga mecânica, de parafusos de pilares protéticos com recobrimento de carbono tipo diamante (DLC) e com dopagem de diamantes (CD-DLC) submetidos ao retorque, em conexões hexagonais externa (HE) e interna (HI). Implantes HE e HI e diferentes tratamentos do parafuso protético foram alocados em grupos experimentais (n = 5): sem tratamento e não submetidos a fadiga (HE-CON) (HI-CON); sem tratamento fadigados (HECONF) (HI-CONF); com DLC fadigado (HE-DLCF) (HI-DLCF) e com CDDLC fadigados (HE-CD-DLCF) (HI-CD-DLCF). Os recobrimentos de DLC e CD-DLC foram depositados a plasma pelo método PECVD. As amostras (implante + parafusos + coroa metálica), que já haviam sido expostas a 1 milhão de ciclos de fadiga, foram retorqueadas com torquímetro digital, com o torque recomendado pelo fabricante 30 N (HE) e 20 N (HI), e submetidos novamente a 1 milhão de ciclos mecânicos. Ao término da fadiga, os parafusos foram destorqueados para verificar a manutenção do torque. Parafusos de cada grupo experimental foram selecionados para observação em MEV. A análise estatística foi realizada pelo teste Anova 2- Fatores (α = 0,05). Não houve interação entre os fatores em estudo (p = 0,765); o tratamento dos parafusos (p = 0,638) e o tipo de conexão (p = 0,615) não apresentaram diferença estatística. Alterações como danos nas roscas do parafuso e remoção do filme foram observados entre os grupos experimentais. Os grupos com revestimento apresentaram pouco ou nenhum dano nas roscas dos parafusos. O revestimento de DLC e CDDLC parece não ter interferido na adaptação do parafuso ao implante. Parafusos protéticos recobertos com DLC e CD-DLC, após o retorque, não elevaram a manutenção do torque / The study analyzed the torque maintain of the screw abutments, with coating of diamond-like carbon (DLC) and doping of diamond (CD-DLC), submitted the retorque in external hexagonal (EH) and internal (IH) connections; after mechanical fatigue. HE and HI implants and different treatments of the abutments screws were divided into experimental groups (n = 5): untreated and not subjected to fatigue (EH-CON) (IHICON); fatigued untreatment (EH-CONF) (IH-CONF); fatigued with DLC (EH- DLCF) (IH-DLCF) and fatigued with CD-DLC (EH-CD-DLCF) (IH-CD-DLCF). The DLC and CD-DLC coating was deposited by plasma, PECVD method. Samples (Implant + abutment screew + metal crown), which had been exposed to 1 million fatigue cycles were retorquiadas, digital torque wrench, to the torque recommended by the manufacturer 30 N (HE) and 20 N (HI), and submitted again to 1 million cycles mechanics. At the end of fatigue, the screws were destorquiados to check the maintenance of torque. Screws from each experimental group were selected for observation by SEM. Statistical analysis was performed by ANOVA 2 Factors test (α = 0.05). There was no interaction among the factors studied (p = 0.765); the treatment of screws (p = 0.638) and the connection type (p = 0.615) showed no statistical difference. The microscopy images showed damage the threads and covering the presence of HI connections. Changes such as damage on the screws threads and film removal were observed among the experimental groups. The coating groups showed little or no damage on the screws threads. The DLC and CD-DLC coating did not interfere in the screw adaptation on the implant. Abutments screew coating with DLC and CD-DLC, after retorque, no raised torque maintenance

Thesis MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2006 / Reluctance Synchronous Machines (RSM) have, due to their rotor geometry, an inherently high torque ripple. This torque ripple is defined as the deviation of the minimum and maximum torque from the average value. It is unwanted as it indicates uneven pull on the rotor causing deformation of it and hence different air-gaps along the rotor circumference as well as acoustic noise. In applications such as power steering, robotics and radar positioning systems where high precision movement is vital, oscillating torque will lead to the malfunction of these devices and therefore suppressed the use and development of RSMs. Unlike the Induction machine (IM), the RSM has no copper losses in the rotor, which reduces the operating temperature significantly. With the development of electronic drives the quality of the output torque could be improved by means of accurate current- and flux space phasor control methods with much success and made the RSM a possible replacement for the IM. However, reducing torque ripple by means of purely geometrical changes is still a challenge to the machine designer. This thesis will focus on the reduction of torque ripple while leaving the average torque relatively unchanged by changing the rotor geometry. The rotor changes will take place by means of flux barriers and cut-outs while the stator has either semi-closed slots or magnetic wedges. In this work rotor structures with equal harmonic magnitudes but their angles 1800 apart. will be combined to form one machine and identify how torque harmonics respond. The change in average torque and power factor will be evaluated with all geometrical changes made to these machines throughout this work.

Orientador: Lafayette Nogueira Júnior / Co-orientador: Argemiro Soares da Silva Sobrinho / Banca: Tarcisio José de Arruda Paes Junior / Banca: Paulo Abdalla Saad / Resumo: O estudo avaliou o efeito da aplicação de dois filmes de Carbono tipo Diamante por plasma no torque reverso dos pilares protéticos submetidos à ciclagem mecânica e analisou a adaptação do pilar e de suas roscas em relação ao implante, bem como a deformação gerada nas roscas dos pilares e nas roscas internas dos implantes. Para tal, foram utilizados 60 conjuntos de implantes de conexão cônica interna (CCI) de 11º e 8º e pilares de corpo único de titânio que foram divididos em seis grupos (n=10): GC-8 (controle) - CCI 8º sem tratamento; DLC-8 - CCI 8º com aplicação de filme de carbono tipo diamante (DLC); AgDLC-8 - CCI 8º com aplicação de filme de carbono tipo diamante dopado com nano partículas de prata (AgDLC); GC-11 (controle) - CCI 11º sem tratamento; DLC-11 - CCI 11º com aplicação de filme de carbono tipo diamante (DLC); AgDLC-11 - CCI 11º com aplicação de filme de carbono tipo diamante dopado com nano partículas de prata (AgDLC). Os filmes foram depositados por meio do processo de Deposição Química a Vapor Assistida por Plasma (PECVD). Os pilares receberam o aperto controlado por um dispositivo de controle de torque digital seguindo as recomendações do fabricante. O teste de fadiga foi conduzido seguindo os parâmetros especificados na norma ISO 14801 com uma carga de 120 Ncm a 2 Hz por 2 x 106 ciclos. Ao final dos ciclos, o valor de destorque dos pilares foi registrado. Análises por Microscopia Eletrônica de Varredura (MEV) foram realizadas em três amostras de cada grupo, antes e após a ciclagem mecânica, para verificar se a adaptação do pilar (corpo e roscas) ao implante foi afetada pela aplicação dos filmes. A caracterização dos filmes foi realizada por meio de análises Tribológicas, bem como por Espectroscopia Raman e Espectrometria de Energia Dispersiva de Raios-X (EDS). Todos os grupos mostraram redução nos valores de torque reverso. O grupo DLC-8 foi o ùnico a apresentar... / Abstract: This study evaluated the effect of the plasma deposition of two diamondlike carbon thin films (DLC) on the reverse torque and adaptation of prosthetic abutments after mechanical cycling. Sixty sets of 11º e 8º tapper connection implants (TCI) and titanium solid abutments were divided in six groups (n=10): GC-8 (control) - 8º TCI with no film deposition; DLC-8 - 8º TCI with DLC deposition; AgDLC-8 - 8º TCI with silver doped DLC (AgDLC); GC-11 (control) - 11º TCI with no film deposition; DLC-11 - 11º TCI with DLC deposition; AgDLC-11 -11º TCI with silver doped DLC (AgDLC); The films were deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD) process. The abutments were tightened with a controlled torque meter device following the manufacturer's recommendations. Mechanical cycling was carried out with a load of 120 Ncm during 2 x 106 cycles with a frequency of 2 Hz (ISO 14801). Afterwards, detorque was measured. Analyses with Scanning Electron Microscopy (SEM) were conducted on three samples of each group before and after mechanical cycling in order to verify the adaptation of the abutments (body and threads). Tribology analyses, as well as Raman Spectroscopy and Energy-Dispersive X-rays Spectroscopy (SDS) analyses were performed for characterization of the different surface treatments. All groups demonstrated reduction of reverse torque values. DLC-8 was the only group that showed an increase on the average reverse torque values / Mestre