Analysis of effectiveness and complications of botulinum toxin A masseter injection and hyaluronic acid chin injection related to lower third of facial contour remodeling

Objective: The present study was aimed to study the effectiveness of botulinum toxin A masseter injection and hyaluronic acid chin injection in pretext of the lower third facial contour remodeling. Methods: 60 Chinese cases that underwent a lower third of facial contour remodeling for the first time were selected. Before surgery, a conventional electromyography was performed. The Root Mean Square (RMS) values were calculated through electromyography and were recorded. Surgery was performed on all the subjects in order to compare satisfaction, muscle strength value of masseter and occurrence rate of complications post-surgery. Scores of surgery satisfaction were administered based on the attitude of medical staff, service quality and facial shape improvement through questionnaires distributed to patients. Results: After one-year of follow-up, there were 38 cases that were very satisfied (63.34%), 20 cases were basically satisfied (33.33%) and 2 were unsatisfied (3.33%). The Root Mean Square (RMS) values were significantly declined after one month of surgery, and it began to increase after 3 months and was back to normal after 12 months. The occurrence rate of complications was high within 3 months after surgery, among which there were 5 muscle atrophy cases (8.33%), 3 facial paralysis cases (5.00%), 4 infection cases (6.67%), 3 anaphylactic reaction cases (5.00%) and 2 toxic reaction cases (3.33%). All cases were back to normal after symptomatic treatment. Conclusion: Botulinum toxin A masseter injection and hyaluronic acid chin injection on lower third of facial contour remodeling are associated with little trauma and high plasticity.