West China Journal of Stomatology ›› 2022, Vol. 40 ›› Issue (4): 476-482.doi: 10.7518/hxkq.2022.04.016

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Two cases of bilateral coronoid process hyperplasia causing restricted mouth opening

Zhang Yanyan1(), Liu Fei1, Shen Jiefei1, Li Xiaoqing2()   

  1. 1.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
    2.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Temporomandibular Joint, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2021-09-12 Revised:2022-04-30 Online:2022-07-25 Published:2022-07-27
  • Contact: Li Xiaoqing E-mail:hxkqyanyanzhang@163.com;xuanxqli@163.com
  • Supported by:
    the Grants of the Department of Science and Technology of Sichuan Province(2020YJ0224);China Postdoctoral Science Foundation(2020M683329);Correspondence: Li Xiaoqing, E-mail: xuanxqli@163.com

Abstract:

Coronoid process hyperplasia (CPH) is a rare condition characterized by the increase in the size of the coronoid process, mainly occurring in the second decades of human life. To provide a reference for the diagnosis and treatment of this disease, we reported the clinical manifestations of two cases, X-ray examination, treatment, and prognosis with mandibular movement and restricted mouth opening (RMO) caused by bilateral CPH. The opening degree of the two cases described in the article increased to almost 40 mm immediately after the elongated coronoid process was surgically removed and a case was maintained normal after 2 months. In another case, CPH recurred after 2 years of follow-up. The etiology of CPH is still unclear, which is associated with various factors. RMO caused by CPH is extremely rare in clinical practice, and it is easy for patients to get confused and be misdiagnosed. It should be diagnosed using comprehensive methods of clinical studies and imaging modalities. Currently, surgical coronoidectomy is an accepted treatment of CPH. Long-term effective opening training is crucial in maintaining its therapeutic effect.

Key words: coracoid process hyperplasia, restricted mouth opening, etiology, diagnosis, treatment

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