Abstract
Introduction:Mandibular coronoid process hyperplasia is an uncommon congenital or developmental temporomandibular joint disorder, characterized by elongation of the coronoid process, which may cause limited mandibular movement as a consequence of interference between the hyperplastic coronoid process and the medial surface of the zygomatic arch.Methods:Mandibular coronoid process hyperplasia commonly affects males in the second decade of life and the exact aetiology and pathogenesis is unknown. The condition can be uni- or bilateral. Progressive painless reduction in mouth opening is the main clinical finding and computed tomography is the most reliable imaging modality for confirming the diagnosis.Results:Surgical intervention involving coronoidectomy and long-term intensive postoperative physiotherapy is the treatment of choice for mandibular coronoid process hyperplasia with impingement on the zygomatic bone and limited mouth opening. However, surgically induced fibrosis and the tendency for mandibular coronoid process regrowth may cause relapse and renewed limited mouth opening. Vigorous physical therapy should therefore be initiated shortly after surgery.Conclusion:The purpose of this case report is to present the clinical and radiographic features of elongated mandibular coronoid process in an 18-year-old male with limited mouth opening, and to discuss the various surgical treatment modalities.
Highlights
Mandibular coronoid process hyperplasia is an uncommon congenital or developmental temporomandibular joint disorder, characterized by elongation of the coronoid process, which may cause limited mandibular movement as a consequence of interference between the hyperplastic coronoid process and the medial surface of the zygomatic arch
We present an 18-years old male with Mandibular coronoid process hyperplasia (MCPH) and limited mouth opening and summarize the current knowledge about this uncommon congenital or developmental temporomandibular joint disorder
MCPH usually affects males in the second decade of life and the main clinical finding is a progressive painless reduction in mouth opening owing to the interference between the elongated coronoid process and the medial surface of the zygomatic bone [1]
Summary
Mandibular coronoid process hyperplasia is an uncommon congenital or developmental temporomandibular joint disorder, characterized by elongation of the coronoid process, which may cause limited mandibular movement as a consequence of interference between the hyperplastic coronoid process and the medial surface of the zygomatic arch. Mandibular coronoid process hyperplasia (MCPH) is classified as a congenital or developmental temporomandibular joint disorder and defined as an abnormal elongation of the coronoid process consisting of histologically normal bone [1 - 3]. MCPH is a rare condition which may enlarge the coronoid processes to such an extent that they can impinge upon the medial surfaces of the zygomatic arches and causes mouth opening limitation [1, 3]. MCPH was first described by Langenbeck in 1853 and the first case of mandibular hypomobility by coronoid process enlargement was reported in 1899 [4, 5]. The unilateral form is often seen in females, whereas the bilateral
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