Finite Element Evaluation of Stable Fixation in Combined Mandibular Fractures.

Purpose: The fixation of combined mandibular fractures, especially symphyseal-condylar fractures, although occurring commonly and having a higher complication rate in the clinic, is rarely investigated regarding predictable therapeutic approaches. Thus this study's aim was to assess different forms of condylar fixation when combined with symphyseal fracture fixation.

Materials And Methods: Using finite element models, we analyzed the stress distribution that occurs when a condylar fracture is fixed with 1 miniplate, 2 miniplates, or a trapezoidal condylar miniplate and when a symphyseal fracture is fixed with 2 parallel plates, 2 perpendicular plates, or 2 lag screws.

Mechanical evaluation of different techniques for symphysis fracture fixation--an in vitro polyurethane mandible study.

Purpose: The aim of this study was to make a comparative evaluation of the mechanical behavior of 4 different internal fixation systems for mandibular symphysis fractures.

Materials And Methods: Forty polyurethane mandible replicas (Nacional, Jaú, SP, Brazil) were used. These were divided into 4 groups of different fixation methods: group 1P, 1 2.

Effect of light curing modes and ethanol immersion media on the susceptibility of a microhybrid composite resin to staining.

The aim of this in vitro study was to evaluate the susceptibility of a hybrid composite resin (Filtek Z250 - 3M ESPE) to staining, when light cured in four different modes and immersed in two different media. Composite resin specimens were randomly prepared and polymerized according to the experimental groups (conventional -50 mW/cm(2) / 30 seconds; soft start -300 mW/cm(2) / 10 seconds + 550 mW/cm(2) / 20 seconds; high intensity -1060 mW/cm(2)--10 seconds; pulse delay -550 mW/cm(2)--1 seconds + 60 seconds of waiting time + 550 mW/cm(2)--20 seconds) and immersed in one of two media (distilled water or absolute ethanol) for 24 h. Next, the specimens were immersed in a 2% methylene blue solution for 12 hours.