This is a novel and comprehensive mandible reduction procedure and is much more complete and more extensive than mandible angle resection. The range of this procedure will be from the mandible angle posterior to the mandible body, which connects with the chinbone (mandibular symphysis). Besides vertical resection of the protrusive mandible angle, Dr. Chuang uses a high-speed electric sawing system with a sagittal saw to longitudinally cut and remove the entire outer cortex of the mandible body (cortical osteotomy) and then performs the adjusting bone shaving procedure on the parts close to both sides of the chinbone. Thus, the maximum amount of the hypertrophic mandible bone and angle can be removed. This extensive surgery will not only remove the mandible angle to soften the jawline but also substantially reduce the width of the lower face in the front view by resecting approximately 3–5 cm of the outer cortex of the mandible body. With simultaneous masseter atrophy, the face width will be reduced by a maximum of 1.0–1.5 cm in total. Moreover, the original jawline can be effectively changed to a more “V-shaped” curve. This procedure can also be performed as part of an extensive V-line facial bone reduction involving chin reduction or genioplasty, which is an optimal solution to slim the face.

The advantages of this surgery are softening of the facial contour in the side view, similar to the single mandible angle resection, and reduction of width of the lower face, resulting in a “V-shaped” or pointed face. According to patients’ requirements, Dr. Chuang can simultaneously perform other procedures, such as chin implants or reduction genioplasty, to adjust the ratio of the lower face for making the entire face almost perfectly oval; thus, the procedure is highly personalized. Because the removal of the outer cortical bone only slightly impacts the entire strength of the mandible, this surgery will not lead to future potential sequelae such as osteoporosis or bone mass loss.。