RESUMEN
The definite cause of temporomandibular joint (TMJ) ankylosis is still an unknown fact. TMJ ankylosis may result from, infection, trauma or insufficient surgical treatment of the mandibular condyle region. Different techniques have been described so far for the treatment of TMJ ankylosis, but no technique has successfully given uniform results. Relapse causing limited mouth opening, infection, open bite, reankylosis are the complications. Many authors agree that aggressive physiotherapy immediately after the surgical procedure, interpositional graft as spacer and wide bone resection are the basic principles in treating TMJ ankylosis. In this article, we discussed a case of unilateral TMJ ankylosis, in a 9-year-old boy, treated with the intre-positional gap arthroplasty with superficial temporalis fascia flap.