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Mouth opening limitation caused by coronoid hyperplasia: a report of four cases.

Kim SM, Lee JH, Kim HJ, Huh JK - J Korean Assoc Oral Maxillofac Surg (2014)

Bottom Line: The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus.However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy.Three were successfully treated with a coronoidectomy and postoperative physical therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Surgery, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea.

ABSTRACT
Coronoid process hyperplasia is a rare condition that causes mouth opening limitation, otherwise known as trismus. The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus. Patients with trismus due to coronoid process hyperplasia do not have any definite symptoms such as temporomandibular joint pain or sounds upon clinical examination, and no significant abnormal signs are observed on panoramic radiographs or magnetic resonance images of the temporomandibular joint. Thus, the diagnosis of trismus is usually very difficult. However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy. This paper describes four cases of patients who visited our clinic for trismus and were subsequently diagnosed with coronoid process hyperplasia. Three were successfully treated with a coronoidectomy and postoperative physical therapy.

No MeSH data available.


Related in: MedlinePlus

A. Preoperative maximum mouth opening distance for case 4. B. Postoperative maximum mouth opening distance for case 4.
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Figure 6: A. Preoperative maximum mouth opening distance for case 4. B. Postoperative maximum mouth opening distance for case 4.

Mentions: An 18-year-old man visited our clinic for mouth opening limitation that had persisted for six months. Attempts to increase mouth opening by manipulation, medication, and a stabilizing splint were not successful. The MIO was 12 mm (Fig. 6. A), and there were no sounds or pain in the TMJ. Due to the lack of improvement in the MIO despite a long period of conservative treatment, CT scans were obtained, and elongation of the right coronoid process was confirmed.(Fig. 7)


Mouth opening limitation caused by coronoid hyperplasia: a report of four cases.

Kim SM, Lee JH, Kim HJ, Huh JK - J Korean Assoc Oral Maxillofac Surg (2014)

A. Preoperative maximum mouth opening distance for case 4. B. Postoperative maximum mouth opening distance for case 4.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4279969&req=5

Figure 6: A. Preoperative maximum mouth opening distance for case 4. B. Postoperative maximum mouth opening distance for case 4.
Mentions: An 18-year-old man visited our clinic for mouth opening limitation that had persisted for six months. Attempts to increase mouth opening by manipulation, medication, and a stabilizing splint were not successful. The MIO was 12 mm (Fig. 6. A), and there were no sounds or pain in the TMJ. Due to the lack of improvement in the MIO despite a long period of conservative treatment, CT scans were obtained, and elongation of the right coronoid process was confirmed.(Fig. 7)

Bottom Line: The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus.However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy.Three were successfully treated with a coronoidectomy and postoperative physical therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Surgery, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea.

ABSTRACT
Coronoid process hyperplasia is a rare condition that causes mouth opening limitation, otherwise known as trismus. The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus. Patients with trismus due to coronoid process hyperplasia do not have any definite symptoms such as temporomandibular joint pain or sounds upon clinical examination, and no significant abnormal signs are observed on panoramic radiographs or magnetic resonance images of the temporomandibular joint. Thus, the diagnosis of trismus is usually very difficult. However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy. This paper describes four cases of patients who visited our clinic for trismus and were subsequently diagnosed with coronoid process hyperplasia. Three were successfully treated with a coronoidectomy and postoperative physical therapy.

No MeSH data available.


Related in: MedlinePlus