title: Orthodontic-surgical treatment: neuromuscular evaluation in open and deep skeletal bite patients.
abstract: BACKGROUND
  The aim of this study was to compare electromyographic data of two groups of patients (open and deep skeletal bite) before and after surgical orthodontic treatment.
  
  
  METHODS
  All patients who underwent orthognathic surgery at the Department of Orthodontics (University of Milan) were subjected to periodic electromyographic evaluation of the masticatory muscles (masseter and anterior temporal muscles) and to electrokinesiographic evaluation of mandibular movements. The sample comprised 72 patients (35 open skeletal bite patients and 37 deep skeletal bite patients) at the end of craniofacial growth. The electromyographic instruments used in the study included a Freely and a K6-I electromyograph. Statistical evaluation was carried out with Student's t tests for independent samples.
  
  
  RESULTS
  Lots of differences between open and deep skeletal bite patients have been underlined by the analysis of the electromyographic data obtained. These results have been obtained with both electromyographic systems. Muscular activity in microvolts is higher in deep skeletal bite patients at the beginning of the treatment than in open bite ones, but during the following phases of the treatment, the two values became similar.
  
  
  CONCLUSIONS
  Morphologic differences between open and deep bite patients can also be demonstrated by instrumental examinations, and their correction after surgical treatment is observable on electromyographic and electrognatographic exams.
authors: Fondazione IRCCS Cà Granda, Department of Orthodontics, University of Milan, 20100 Milan Italy. giampietro.farronato@unimi.it.
authors: Giampietro
authors: G
authors: Farronato
authors: Lucia
authors: L
authors: Giannini
authors: Guido
authors: G
authors: Galbiati
authors: Santo Andrea
authors: SA
authors: Stabilini
authors: Cinzia
authors: C
authors: Maspero
mesh_terms: D004568:Electrodiagnosis / Q000379:methods; D004576:Electromyography / Q000379:methods*; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D018953:Kinesiology, Applied / Q000379:methods; D008297:Male; D008334:Mandible / Q000503:physiopathology; D008406:Masseter Muscle / Q000503:physiopathology; D009469:Neuromuscular Junction / Q000502:physiology; D024343:Open Bite / Q000503:physiopathology / Q000601:surgery*; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D057887:Overbite / Q000503:physiopathology / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology; D013703:Temporal Muscle / Q000503:physiopathology