【Yang Yeh】評論

參考Peterson's Principle of Oral and Maxillofacial SurgeryCh16 Rigid versus Nonrigid Fixation p379The directions of forces that are distributed through the anterior mandible vary with the activity of the mandible. This means that the classic zones of tension on the superior and compression on the inferior surfaces of the mandible are not absolute. Instead, the anterior mandible undergoes shearing and torsional (twisting) forces during functional activities. Application of fixation devices must, therefore, take these factors into consideration. This is why most surgeons advocate two points of fixation in the symphysis: either two bone plates, two lag screws, or possibly one plate or lag screw combined with an arch bar (see Figure 16-1A–H).