@article{oai:kanazawa-u.repo.nii.ac.jp:00013118,
 author = {Ueki, Koichiro and Nakagawa, Kiyomasa and Marukawa, Kohei and Shimada, Mayumi and Yoshida, Kan and Hashiba, Yukari and Shimizu, Chika and Yamamoto, Etsuhide},
 issue = {2},
 journal = {Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics},
 month = {Feb},
 note = {Purpose: The purpose of this study was to objectively evaluate hypoesthesia of the upper lip following Le Fort I osteotomy in combination with mandibular osteotomy with trigeminal somatosensory evoked potential (TSEP). Subjects and methods: The subjects consisted of 25 patients with mandibular prognathism with maxillary retrognathism mandibular prognathism with or without asymmetry, who underwent Le Fort I osteotomy in combination with sagittal split ramus osteotomy (SSRO) or intraoral vertical ramus osteotomy (IVRO).Trigeminal nerve hypoesthesia at the region of the upper lip was assessed bilaterally by the TSEP method. The electrodes were placed exactly above the highest point of the vermilion border and on the mucosa of the upper lip. An electroencephalograph recording system (Neuropack Sigma; Nihon Koden Corp., Tokyo, Japan) was used to analyze the potentials. Each patient was evaluated preoperatively and then postoperatively at 1 week, 2 weeks, 1 month, 3 months, 6 months, and 1 year. Results: The average measurable period and standard deviation of TSEP of the upper lip was 7.8 ± 10.7 weeks following Le Fort I osteotomy, TSEP of the lower lip was 4.6 ± 9.2 weeks in the patients who underwent SSRO with Le Fort I osteotomy, and 1.2 ± 0.4 weeks in the patients who underwent IVRO with Le Fort I osteotomy. Conclusion: This study objectively proved that hypoesthesia could appear in the upper lips following Le Fort I osteotomy with TSEP. The measurable period for the upper lip following Le Fort I osteotomy tended to be longer than that for the lower lip in the patients who underwent SSRO and IVRO with Le Fort I osteotomy. © 2007 Mosby, Inc. All rights reserved., 金沢大学医学部附属病院歯科口腔外科},
 pages = {169--174},
 title = {Evaluation of upper lip hypoesthesia with a trigeminal somatosensory-evoked potential following Le Fort I osteotomy in combination with mandibular osteotomy},
 volume = {103},
 year = {2007}
}