The postoperative trismus, nerve injury and secondary angle formation after partial masseter muscle resection combined with mandibular angle reduction: a case report

Abstract

A patient, who underwent partial masseter muscle resection and mandibular angle reduction at a plastic surgery clinic, visited this hospital with major complaints of trismus and dysesthesia. A secondary angle formation due to a wrong surgical method was observed via clinical and radiological examinations, and the patient complained of trismus due to the postoperative scars and muscular atrophy caused by the masseter muscle resection. The need for a masseter muscle resection in square jaw patients must be approached with caution. In addition, surgical techniques must be carefully selected in order to prevent complications, and obtain effective and satisfactory surgery results.

Unusual Case of Masseter Muscle Hypertrophy in Adolescence—Case Report and Literature Overview

“…Surgery was then performed using an extraoral approach with intradermal sutures for a better cosmetic appearance. Surgery may pose some risks such as facial or mandibular nerve injuries, masseter artery injury and bleeding, bone lesions, infections, postoperative trismus, mouth opening limitation, and sequelae from general anesthesia [ 25 , 38 ]. Our patient developed a postoperative hematoma, which was resorbed after 10 days of conservative treatment, and the long-term follow-up showed favorable results.…”

Relationship Between Masticatory Muscle Size and Bone Regeneration After Mandibular Angle Osteotomy

“…At present, to prevent bone regeneration and reduce the facial soft tissue width, many surgeons choose mandibular angle osteotomy with outer cortex reduction and masseter muscle partial excision simultaneously 21 . However, this procedure resulted in increased hemorrhage 22 and risks of nerve injury, 23 prolonged operation time, and improper excision, thereby resulting in facial soft tissue contour deformities. In our opinion, by avoiding eating hard food after surgery and treating masseter muscle hypertrophy with injection of botulinum toxin type A, the long-term stability of postoperative outcomes will be increased.…”

Effect of the masseter muscle injection of botulinum toxin A on the mandibular bone growth of developmental rats

“…In functional matrix theory, craniofacial growth could be regulated by the surrounding soft tissue and muscle function [ 10 ]. In human studies, masticatory muscle size and activity are especially correlated with facial bone structure [ 11 , 12 ]. Masticatory muscle hyperactivity increases the loading of the jaw, leading to increased skeletal bone growth and size [ 9 ].…”