Open Reduction Effects of Digitally Treating Zygomaticomaxillary Complex Fractures With Bio-Resorbable Materials

The application of bio-resorbable plates in craniomaxillofacial surgery is increasing because of the advantage of avoiding secondary surgery. This study aimed to evaluate the effects of osteosynthesis with prebent bio-resorbable plates for treating zygomaticomaxillary complex (ZMC) fractures. We implemented a prospective case series composed of patients with ZMC fractures who underwent treatment at the School of Stomatology at China Medical University. Bio-resorbable plates were used for fracture fixation. The fractures were stabilized with bio-resorbable plates prebent on a 3-dimensionally printed skull model with the fractures reduced using virtual simulation. The primary outcome variable was the stability rate of reduced bone segments. Other study variables were mouth opening, occlusion, paresthesia or anesthesia in the infraorbital nerve region (PAIN), and diplopia. Outcome variables were determined by calculating stability rates of reduced bone segments, resolution rates of postoperative restricted mouth opening, malocclusion, PAIN, and diplopia. The sample was composed of 11 patients recruited between November 2016 and September 2018. All surgical procedures were successful, with no severe complications. The stability rate of reduced bone segments from different mechanical buttress regions was 100%. Satisfactory postoperative stability of bio-resorbable plates was obtained in all cases. The resolution rates of postoperative restricted mouth opening and malocclusion were 75 and 100%, respectively. PAIN and diplopia symptoms resolved in 50 and 100% of cases, respectively. The results suggest that osteosynthesis with bio-resorbable plates prebent on a 3-dimensionally printed skull model, designed by virtual simulation, works well for patients with ZMC fractures. Future studies should focus on the broader applications of these findings in the practice of oral and maxillofacial surgery.