This study aimed to evaluate whether the use of alloplastic implants in the mandibular body and angle as an adjunct to orthognathic surgery affects the jaw reflex. 2 patients with severe mandibular asymmetry underwent sagittal split osteotomy combined with Medpor porous polyethylene implants. To examine changes in reflexes, surface electromyographic data were collected from the masseter muscle at multiple time points. The latencies and durations of the silent period were measured. In both patients, no masseter inhibitory reflex response was observed on the Medpor-augmented side during the first month post-surgery. Although the masticatory inhibitory reflex latencies, durations, and patterns were similar between the left and right sides for both patients, no silent period response was recorded on the side with the porous polyethylene implant by the sixth month after surgery. Consequently, the use of porous polyethylene implants may reduce masticatory reflex activity. While these implants appear to be clinically safe, careful evaluation of indications, risks, and potential outcomes is essential before their application.
