Hypoesthesia associated with mandibular movement after sagittal split ramus osteotomy

• Published in: Oral and maxillofacial surgery Vol. 21; no. 3; pp. 313 - 319
• Main Authors: Yamamoto, Toru, Fujii-Abe, Keiko, Fukayama, Haruhisa, Kawahara, Hiroshi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2017; Springer Nature B.V
• Subjects: Adult; Dentistry; Female; Follow-Up Studies; Humans; Hypesthesia - etiology; Japan; Lip - innervation; Male; Mandible - innervation; Mandible - surgery; Medicine; Medicine & Public Health; Movement - physiology; Oral and Maxillofacial Surgery; Original Article; Osteotomy, Sagittal Split Ramus - adverse effects; Postoperative Complications - etiology; Remission, Spontaneous; Retrospective Studies; Sensory Thresholds - physiology; Visual Analog Scale; Japan; Orthognathic surgery; Neurosensory disturbance; Hypoesthesia; Sagittal split osteotomy
• ISSN: 1865-1550; 1865-1569
• DOI: 10.1007/s10006-017-0633-2

Purpose This retrospective study investigated the relationship between the degree of neurosensory disturbance (NSD) and mandibular movement distance after sagittal split ramus osteotomy (SSRO) and assessed sensory recovery. Methods Lower lip hypoesthesia was evaluated at 1 week, 1 month, and 2 months after SSRO in 38 patients categorized according to the distance of mandibular movement: S group (0–7 mm; n  = 17, 4 males and 13 females) and L group (7–14 mm; n  = 21, 7 males, 14 females). Symptoms were evaluated by visual analog scale (VAS), tactile-threshold (SW) test, static 2-point discrimination (s-2PD) test, and current perception threshold (CPT) test. Results The two groups did not differ significantly in gender and age. The Aβ fiber results of the CPT test differed significantly between the groups at 1 week and 1 month postsurgery ( P  < 0.05). There were no significant differences between the groups throughout the period in terms of VAS, SW, s-2PD, Aδ fiber, and C fiber of CPT. Conclusions Post-SSRO, the incidence of NSD in terms of tactile sensation may be greater in the L group early postoperatively. This may assist surgeons in explaining postoperative hypoesthesia to patients preoperatively.