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

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 10mm/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 5mm 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.

Submental skin: morphohistological study of interest to liposuction.

Skin study of the submental region in cadavers made possible the evaluation of its regional characteristics. Sex or race were not reported, but the age group most appropriate to liposuction was considered. In this way, the authors believed that through standards established at the time, results, as to the skin retraction in liposuction, will be able to be analyzed in a comparative form in the future.