Journal of the Korean Association of Oral and Maxillofacial Surgeons

The Korean Association of Oral and Maxillofacial Surgeons (대한구강악안면외과학회)
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Correction of post-traumatic anterior open bite by injection of botulinum toxin type A into the anterior belly of the digastric muscle: case report

  • Seok, Hyun (Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Yong-Tae (Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung-Wonju National University) ;
  • Kim, Seong-Gon (Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Young-Wook (Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung-Wonju National University)
  • Received : 2013.06.04
  • Accepted : 2013.07.25
  • Published : 2013.08.30
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Abstract

Post-traumatic anterior open bite can occur as a result of broken balance among the masticatory muscles. The superior hyoid muscle group retracts the mandible downward and contributes to the anterior open bite. Denervation of the digastric muscle by injection of botulinum toxin type A (BTX-A) can reduce the power of the digastric muscle and help to resolve the post-traumatic anterior open bite. A patient with a bilateral angle fracture had an anterior open bite even after undergoing three operations under general anesthesia and rubber traction. Although the open bite showed some improvement by the repeated operation, the occlusion was still unstable six weeks after the initial treatment. To eliminate the residual anterior open bite, BTX-A was injected into the anterior belly of the digastric muscle. Following injection of BTX-A, the anterior open bite showed immediate improvement. Complication and relapse were not observed during follow-up. Long-standing post-traumatic open bite could be successfully corrected by injection of BTX-A into the anterior belly of the digastric muscle without complication.

Keywords

References

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