[OSS 3O]’s patient-specific mandibular titanium bone plate is a device designed specifically to be used for patients who need treatment with mandibulectomy and reconstructive surgery. The implant is made of titanium alloy produced via additive manufacturing (Laser Powder Bed Fusion). [OSS 3O]’s patient-specific mandibular titanium bone plate is designed to incorporate a custom-made surgical assisting kit to help surgeons perform the surgery as planned. The preoperative plan is a corporation of surgeons and [OSS 3O]’s engineer. The surgeon approves the design of the implant and surgical assisting kit prior to fabrication of the devices.