title: The effect of early physiotherapy on the recovery of mandibular function after orthognathic surgery for class III correction. Part II: electromyographic activity of masticatory muscles.
abstract: The study was conducted to evaluate the effect of early physical rehabilitation by comparing the differences of surface electromyographic (sEMG) activity in the masseter and anterior temporalis muscles after surgical correction of skeletal class III malocclusion. The prospective study included 63 patients; the experimental groups contained 31 patients who received early systematic physical rehabilitation; the control group (32 patients) did not receive physiotherapy. The amplitude of sEMG in the masticatory muscles reached 72.6-121.3% and 37.5-64.6% of pre-surgical values in the experimental and control groups respectively at 6 weeks after orthognathic surgery (OGS). At 6 months after OGS, the sEMG reached 135.1-233.4% and 89.6-122.5% of pre-surgical values in the experimental and control groups respectively. Most variables in the sEMG examination indicated that recovery of the masticatory muscles in the experimental group was better than the control group as estimated in the early phase (T1 to T2) and the total phase (T1 to T3); there were no significant differences between the mean recovery percentages in the later phase (T2 to T3). Early physical rehabilitative therapy is helpful for early recovery of muscle activity in masticatory muscles after OGS. After termination of physical therapy, no significant difference in recovery was indicated in patients with or without early physiotherapy.
authors.affiliation: Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan; Department of Craniofacial Orthodontics (Director: E.W.-C. Ko), Chang Gung Memorial Hospital, Taipei, Taiwan; Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan. Electronic address: ellenko.wc@msa.hinet.net.
authors.forename: Ellen Wen-Ching
authors.initials: EW
authors.lastname: Ko
authors.affiliation: Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan; Department of Dentistry, Taoyuan Armed Forces General Hospital, Taiwan.
authors.forename: Terry Te-Yi
authors.initials: TT
authors.lastname: Teng
authors.affiliation: Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan; Department of Craniofacial Orthodontics (Director: E.W.-C. Ko), Chang Gung Memorial Hospital, Taipei, Taiwan; Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan.
authors.forename: Chiung Shing
authors.initials: CS
authors.lastname: Huang
authors.affiliation: Graduate Institute of Craniofacial and Oral Science, Chang Gung University, Taoyuan, Taiwan; Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan; Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan.
authors.forename: Yu-Ray
authors.initials: YR
authors.lastname: Chen
mesh_terms: D000328:Adult; D002508:Cephalometry / Q000379:methods; D004032:Diet; D004576:Electromyography / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery*; D008334:Mandible / Q000503:physiopathology* / Q000601:surgery; D008406:Masseter Muscle / Q000503:physiopathology*; D008437:Maxilla / Q000601:surgery; D009119:Muscle Contraction / Q000502:physiology; D009129:Muscle Tonus / Q000502:physiology; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D019340:Osteotomy, Le Fort / Q000379:methods; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods; D026741:Physical Therapy Modalities; D011446:Prospective Studies; D020127:Recovery of Function / Q000502:physiology*; D013703:Temporal Muscle / Q000503:physiopathology*; D055815:Young Adult
keywords: Electromyography; Orthognathic surgery; Physical rehabilitation; Skeletal class III malocclusion