Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Prognosis in case of nerve disturbance after mandibular implant surgery in relation to computed tomography findings and symptoms

  • Na, Ji Yeon (Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry) ;
  • Han, Sang-Sun (Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry) ;
  • Jeon, KugJin (Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry) ;
  • Choi, Yoon Joo (Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry) ;
  • Choi, Seong Ho (Department of Periodontology, Yonsei University College of Dentistry) ;
  • Lee, Chena (Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry)
  • Received : 2019.01.12
  • Accepted : 2019.03.13
  • Published : 2019.04.30
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Abstract

Purpose: The aim of this study was to evaluate the computed tomography (CT) imaging findings and clinical symptoms of patients who complained of neurosensory disturbances after mandibular implant surgery, and to investigate the relationships of these parameters with the prognosis for recovery. Methods: CT scans were reviewed in 56 patients with nerve disturbance after mandibular implant surgery. Two oral radiologists classified the imaging findings into intrusion, contact, close, and separate groups according to the distance from the inferior border of the implant to the roof of the mandibular canal (MC). The symptoms of 56 patients were classified into 8 groups and the frequency of each group was investigated. Patients were categorized according to symptom improvement into no recovery and recovery groups, and the relationships of recovery with the CT classification and specific symptom groups were analyzed. Results: Thirty-eight of the 56 nerve disturbance cases showed improvement. The close and separate groups in the CT classification had a strong tendency for recovery (90.9% and 81.8%, respectively) (P<0.05). Although the lowest recovery rate was found in the intrusion group, it was non-negligible, at 50%. The 6 patients with a worm crawling feeling all improved, while the 8 cases with a tightening sensation showed the lowest recovery rate, at 12.5%, and the symptom of a tightening sensation occurred only in the intrusion and contact groups. Conclusions: The closer the implant fixture was to the MC on CT images, the less likely the patient was to recover. Regarding paresthesia symptoms, while a worm crawling feeling is thought to be a predictor of recovery, a tightening sensation appeared to be associated with a lower recovery rate.

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