ObjectivesPrevious studies that evaluated the torque needed for removing dental implant screws have not considered the manner of transfer of the occlusal loads in clinical settings. Instead, the torque used for removal was applied directly to the screw, and most of them omitted the possibility that the hexagon could limit the action of the occlusal load in the loosening of the screws. The present study proposes a method for evaluating the screw removal torque in an anti-rotational device independent way, creating an unscrewing load transfer to the entire assembly, not only to the screw.Material and methodsTwenty hexagonal abutments without the hexagon in their bases were fixed with a screw to 20 dental implants. They were divided into two groups: Group 1 used titanium screws and Group 2 used titanium screws covered with a solid lubricant. A torque of 32 Ncm was applied to the screw and then a custom-made wrench was used for rotating the abutment counterclockwise, to loosen the screw. A digital torque meter recorded the torque required to loosen the abutment.ResultsThere was a significant difference between the means of Group 1 (38.62±6.43 Ncm) and Group 2 (48.47±5.04 Ncm), with p=0.001.ConclusionThis methodology was effective in comparing unscrewing torque values of the implant-abutment junction even with a limited sample size. It confirmed a previously shown significant difference between two types of screws.
Devido ao avanço da Odontologia digital, a técnica Digital Smile Design (DSD) vem ganhando credibilidade por par te dos profissionais e pacientes. O planejamento de tratamentos restauradores estéticos e funcionais torna-se mais previsível com sua utilização. Este relato de caso apresenta uma paciente com queixa estética do tamanho e forma dos seus dentes anteriores, associada a grande exposição gengival. Fotografias foram auxiliares impor tantes no planejamento da intervenção odontológica. Estas serviram para análises faciais, desenhos de linhas de orientação e de formas dentárias mais adequadas. Utilizou-se um software chamado Keynote, capaz de gerenciar fotos, criar medidas, linhas retas e curvas, facilitando o planejamento de uma nova proporção dental. Ao término deste processo a paciente pode observar, pelo auxílio das fotografias, o novo sorriso que foi construído vir tualmente. Desta forma, tornou-se mais fácil, por par te dela, a aceitação do plano de tratamento, possibilitando que a mesma faça uma prova do seu novo sorriso com a realização do mock-up.
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