J Periodontal Implant Sci.  2019 Apr;49(2):127-135. 10.5051/jpis.2019.49.2.127.

Prognosis in case of nerve disturbance after mandibular implant surgery in relation to computed tomography findings and symptoms

• Na JY
• Han SS
• Jeon K
• Choi YJ
• Choi SH
• Lee C

• KMID: 2444224
• DOI: http://doi.org/10.5051/jpis.2019.49.2.127

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.

Keyword

Tomography, X-Ray Computed; Mandibular nerve; Paresthesia

MeSH Terms

Classification
Humans
Mandibular Nerve
Paresthesia
Prognosis*
Sensation
Tomography, X-Ray Computed

Figure

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  Figure 1 Each computed tomography image was classified into 1 of 4 groups according to the distance from the implant fixture to the mandibular canal. (A) Intrusion group, (B) Contact group, (C) Close group, and (D) Separate group.

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