In vitro mechanical assessment of 2.0-mm system three-dimensional miniplates in anterior mandibular fractures

Abstract

Abstract. This study constituted a comparative assessment of the mechanical resistance of square and rectangular 2.0-mm system three-dimensional miniplates as compared to the standard configuration using two straight miniplates. 90 polyurethane replica mandibles were used for the mechanical trials. Groups 1, 2, and 3 simulated complete symphyseal fractures characterized by linear separation of the central incisors; groups 4, 5, and 6 simulated parasymphyseal fractures with an oblique configuration. Groups 1 and 4 represented the standard method with two straight miniplates set parallel to one another. Square miniplates were used in groups 2 and 5, and rectangular miniplates in groups 3 and 6. A universal testing machine set to a velocity of 10 mm/min and delivering a vertical linear load to the first left molar was used to test each group. Maximum load values and load values with pre-established dislocation of 5 mm were obtained and submitted to statistical analysis using a calculated reliability interval of 95%. The mechanical performances of the devices were similar, except in the case of rectangular plates used in the parasymphyseal fractures. The innovative fixation methods used showed significantly better results in the case of symphyseal fractures.

Herbert Bone Screw Versus Lag Screw in the Treatment of Anterior Mandibular Fracture (Randomized Clinical Trial)

“…Management of anterior mandibular fracture in literature shows variety of options for reduction and fixation, such as lag screws, double miniplates, reconstruction plates and using arch bar with single miniplate or lag screw (11)(12)(13). These are classified to be rigid or functionally stable methods as they allow early function and decreases the intra-fragmentary mobility.…”

Comparitive assessment of bite forces in subjects treated for anterior mandibular fractures with 3-dimensional plates and standard miniplates

“…It is more difficult to get a perfect adaptation with the 3D plates than with the linear ones because they are objects in the form of a plane that need to be adapted to a curved surface and not just an object in the form of a straight line. 11 Therefore, we undertook a study to compare the efficiency of 3 D miniplates and conventional Miniplates in the management of mandibular fractures in the interangular region on the basis of bite force and other clinical parameters.…”

Tridimensional Plates in Mandibular Symphysis Fracture

“…Una limitación en el uso de la placa 3D 2-by-2 esta en que la posición de la placa no siempre puede mantener paralela la barra de la placa con la línea de la fractura, lo que limitaría la eficiencia de su uso. Esta conclusión también fue señalada recientemente por de Oliveira et al (2014), quienes en un trabajo in vitro demostraron menor eficiencia del soporte mecánico del sistema 3D 2-by-2 en el caso de fracturas oblicuas de sínfisis. Esta limitación puede ser disminuida cuando se aumenta la cantidad de tornillos incluidos en la placa 3D como ha sido presentado en algunas series de casos.…”

“…En las consideraciones mecánica de estudios in vitro que analizan los diferentes sistemas (placas de mayor y menor tamaño, tornillos compresivos, placas 3D) en fracturas de sínfisis mandibular no se han observado diferencias importantes en el desplazamiento de la fractura a la carga vertical (Feledy et al, 2004;Vieira e Oliveira & Passeri;de Oliveira et al). Lovald et al (2010), en un estudio con análisis finito, presentó resultados favorables en la distribución de tensiones en los tornillos cuando fueron empleados en placas 3D, utilizando un diseño tipo "X" modificado, mediante sistema con instalación de 8 tornillos.…”