Bone regeneration does not lead to an increase in facial width after reduction gonioplasty with our technique, and the use of a high-speed rotary cutting bur without a water coolant decreases bone regeneration. The soft tissue response ratio is higher in the anterior mandible, and the outcome of reduction gonioplasty is a sharper lower face with a full cheek. Reduction gonioplasty is an effective and predictable lower face reshaping surgery.

Silicone triangle template technique is an effective method to achieve highly symmetrical mandibular chin-body osteotomy and boost surgeon's confidence.

After reduction gonioplasty, the masseter muscle atrophied (reduced 20.98% ± 8.75%), especially the lower part of the masseter muscle in the long-term follow-up. Most patients with prominent mandibular angles should be treated with reduction gonioplasty without approaching the masseter muscle.

Screw fixation is used for accurate augmentation by porous polyethylene implant in traumatic enophthalmos correction to avoid complications such as migration and protrusion. We report an incident of titanium screw entered into the maxillary sinus during enophthalmos correction with porous polyethylene implant. Such incident could be avoided by standard manipulation. We here present the rare case and offer proposals for the screw fixation of porous polyethylene implant during traumatic enophthalmos correction.