Ghazizadeh Maryam, Sheikhi Mahnaz, Salehi Mohammad Mahdi, Khaleghi Amin
Department of Oral & Maxillofacial Radiology, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Dental Research Center, Department of Oral & Maxillofacial Radiology, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Radiol Case Rep. 2017 Dec 29;13(1):112-117. doi: 10.1016/j.radcr.2017.11.001. eCollection 2018 Feb.
The coronoid process is a beaklike process in the ramus of the mandible. Coronoid process hyperplasia (CPH) is a rare possible cause of reduced mouth opening. An overgrown process interferes with mandibular rotation and lateral excursion and hence leads to restricted mouth opening (RMO). Although some factors are suggested, etiology of CPH is not completely known. Prescription of suitable radiography is necessary for an accurate diagnosis. This article reports a 30-year-old man with bilateral CPH and progressive RMO since childhood. This disorder affected his oral hygiene and quality of life. With the help of different types of radiography, CPH was diagnosed and coronoidectomy was the only treatment option. The patient showed normal jaw movements after the surgery and postoperative physiotherapy. General dentists have an important role in noticing RMO and referring the patients to maxillofacial radiologists. Although it is a rare phenomenon, general dentists need to keep CPH in mind as a possible cause. Panoramic imaging accompanied by computed tomography or cone beam computed tomography is the best imaging option in such cases.
冠状突是下颌骨升支内的一个喙状突起。冠状突增生（CPH）是导致张口受限的罕见原因。增生的冠状突会干扰下颌骨的旋转和侧方运动，进而导致张口受限（RMO）。尽管提出了一些相关因素，但CPH的病因尚不完全清楚。进行适当的影像学检查对于准确诊断是必要的。本文报告了一名30岁男性，自幼患有双侧CPH并逐渐出现张口受限。这种疾病影响了他的口腔卫生和生活质量。借助不同类型的影像学检查，诊断为CPH，而冠突切除术是唯一的治疗选择。术后经过理疗，患者的颌骨运动恢复正常。普通牙医在发现张口受限并将患者转诊至颌面放射科医生方面起着重要作用。尽管这是一种罕见现象，但普通牙医需要将CPH视为可能的病因之一。在这种情况下，全景成像结合计算机断层扫描或锥形束计算机断层扫描是最佳的影像学检查方法。
