5 research outputs found

    Avalia??o da for?a de uni?o de diferentes t?cnicas de soldagem para uso em ortodontia

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    Submitted by Caroline Xavier ([email protected]) on 2017-06-30T18:49:20Z No. of bitstreams: 1 DIS_FERNANDA_DE_SOUZA_HENKIN_PARCIAL.pdf: 153660 bytes, checksum: cc61f5fcacec40f72a7ba7bfb17c4045 (MD5)Approved for entry into archive by Caroline Xavier ([email protected]) on 2017-06-30T18:49:25Z (GMT) No. of bitstreams: 1 DIS_FERNANDA_DE_SOUZA_HENKIN_PARCIAL.pdf: 153660 bytes, checksum: cc61f5fcacec40f72a7ba7bfb17c4045 (MD5)Made available in DSpace on 2017-06-30T18:49:32Z (GMT). No. of bitstreams: 1 DIS_FERNANDA_DE_SOUZA_HENKIN_PARCIAL.pdf: 153660 bytes, checksum: cc61f5fcacec40f72a7ba7bfb17c4045 (MD5) Previous issue date: 2017-01-19Introduction: During orthodontic treatment, the use of appliances and devices that require welding procedures is often needed. Besides conventional silver soldering, different joining methods ? with potentially higher biocompatibility ? can be used. The mechanical strength of the welded areas is critical for their success, and must be evaluated. Objective: To review the joining methods for orthodontic purpose and evaluate the strength ? by tensile strength measurements ? of Silver Soldering, Spot, laser and TIG welding. Materials and Methods: 40 stainless steel wire segments with 0.8 mm diameter (Morelli, Sorocaba/SP, Brasil) were joined by means of silver soldering, spot, laser and TIG welding. For each joining method, 10 specimens were produced. Tensile strength test was performed 24 hours after welding by means of a universal testing machine (Instron Corporation, Canton, USA) using a cell load of 1000 N with a crosshead speed of 10 mm/minute. Results: The highest tensile strenght mean values was obtained by silver soldering (532.1N), followed by laser (419.8N), spot (301.1N) and TIG (216,3N) welding. Statistically significant diferences were observed between the groups, and the Dunn post-hoc test revealed difference between laser and spot welding (p=0046), laser and tig (p=0.016), spot and silver (p=2.5e-05) and silver and TIG (p=4.6e-06). Conclusions: The strenght of the laser joints are comparable to the Silver soldering joints, and represent a favorable alternative for orthodontic use. The spot and TIG welding methods presented comparable and significantly lower strenghts in relation do laser and silver soldering methods.Introdu??o: Durante o tratamento ortod?ntico, frequentemente s?o utilizados dispositivos e aparelhos auxiliares que requerem soldagem para a sua confec??o. Al?m do processo de soldagem convencional ? prata, diferentes m?todos ? potencialmente mais biocompat?veis - podem ser utilizados. A resist?ncia mec?nica destas soldas ? fundamental para seu sucesso e deve ser avaliada. Objetivo: Revisar os m?todos de soldagem dispon?veis para uso em Ortodontia e avaliar a for?a de uni?o das soldas ? tra??o em soldas ponto, prata, laser e TIG. Materiais e M?todos: 40 segmentos de fio de a?o inoxid?vel de 0,8mm (Morelli, Sorocaba/SP, Brasil) foram soldados entre si atrav?s das t?cnicas de soldagem el?trica, ? prata, a laser e TIG, sendo realizadas 10 soldagens para cada t?cnica. Foi realizado ensaio de tra??o por meio de uma m?quina de ensaios universal (Emic DL- 2000), utilizando c?lula de carga de 1000 N e velocidade de 10 mm/min. Resultados: O grupo de soldagem ? prata apresentou a maior m?dia de resist?ncia ? tra??o (532,1N), seguido pelos grupos laser (419,8N), ponto (301,1N) e TIG (216,3N) respectivamente. Houve diferen?a significativa entre os grupos, e partir do teste post-hoc de Dunn identificou-se que esta diferen?a ocorreu entre os grupos laser e ponto (p=0,046), laser e TIG (p=0,016), ponto e prata (p=2,5e-05) e prata e tig (p=4,6e-06). Conclus?es: A for?a de uni?o de soldagens a laser pode ser compar?vel com ? de soldagens ? prata e apresenta-se como boa alternativa para uso em Ortodontia. As t?cnicas de soldagem a ponto e a TIG apresentaram for?a de uni?o compar?veis e significativamente inferiores aos das soldagens a laser e ? prata

    Análise in vitro da resistência adesiva e do índice de adesivo remanescente em diferentes tipos de braquetes metálicos

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    Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives: To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods: A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion: Among the evaluated brackets, the one with the lowest mean shear bond strength values was MorelliTM. General evaluation of groups indicated that a greater number of bond failure occurred at the enamel/adhesive interface.Introdução: atualmente, há uma grande diversidade de braquetes ortodônticos no mercado brasileiro, e a avaliação desses é fundamental para que os profissionais conheçam suas propriedades e possam qualificar a sua escolha. Objetivo: avaliar o desempenho de diferentes braquetes metálicos — com diferentes características de base —, por meio da resistência de união e do Índice de Adesivo Remanescente (IAR). Material e Métodos: braquetes de sete marcas distintas foram testados (Morelli®, American Orthodontics®, TP Orthodontics®, Abzil-3M®, Orthometric®, Tecnident® e UNIDEN®). Os braquetes foram colados em incisivos bovinos totalizando 105 corpos de prova. O teste de resistência ao cisalhamento foi realizado 24h após a colagem e, em seguida, foi avaliado o IAR, por meio do uso de um microscópio óptico, em aumento de 10 vezes. Resultados: a média dos valores de resistência de união variou entre 3,845 ± 3,997MPa (Morelli®) e 9,871 ± 5,106MPa (Tecnident®). A maioria dos escores do IAR foi de 0 e 1. Conclusão: entre os braquetes avaliados, o que obteve a menor média de resistência de união foi o Morelli®. A avaliação geral dos grupos indicou maior número de falhas de colagem na interface esmalte/adesivo

    Análise in vitro da resistência adesiva e do índice de adesivo remanescente em diferentes tipos de braquetes metálicos

    No full text
    Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives: To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods: A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion: Among the evaluated brackets, the one with the lowest mean shear bond strength values was MorelliTM. General evaluation of groups indicated that a greater number of bond failure occurred at the enamel/adhesive interface.Introdução: atualmente, há uma grande diversidade de braquetes ortodônticos no mercado brasileiro, e a avaliação desses é fundamental para que os profissionais conheçam suas propriedades e possam qualificar a sua escolha. Objetivo: avaliar o desempenho de diferentes braquetes metálicos — com diferentes características de base —, por meio da resistência de união e do Índice de Adesivo Remanescente (IAR). Material e Métodos: braquetes de sete marcas distintas foram testados (Morelli®, American Orthodontics®, TP Orthodontics®, Abzil-3M®, Orthometric®, Tecnident® e UNIDEN®). Os braquetes foram colados em incisivos bovinos totalizando 105 corpos de prova. O teste de resistência ao cisalhamento foi realizado 24h após a colagem e, em seguida, foi avaliado o IAR, por meio do uso de um microscópio óptico, em aumento de 10 vezes. Resultados: a média dos valores de resistência de união variou entre 3,845 ± 3,997MPa (Morelli®) e 9,871 ± 5,106MPa (Tecnident®). A maioria dos escores do IAR foi de 0 e 1. Conclusão: entre os braquetes avaliados, o que obteve a menor média de resistência de união foi o Morelli®. A avaliação geral dos grupos indicou maior número de falhas de colagem na interface esmalte/adesivo

    In vitro analysis of shear bond strength and adhesive remnant index of different metal brackets

    No full text
    ABSTRACT Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives: To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods: A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion: Among the evaluated brackets, the one with the lowest mean shear bond strength values was MorelliTM. General evaluation of groups indicated that a greater number of bond failure occurred at the enamel/adhesive interface
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