title: Orthodontic-surgical treatment: neuromuscular evaluation in skeletal Class II and Class III patients.
abstract: OBJECTIVE
  The aim of this study was the evaluation of the neuromuscular response to treatment according to diagnostic phases, as a follow-up of patients under surgical orthodontic treatment. The patient sample was subdivided into sub-samples, according to clinical characteristics.
  
  
  METHODS
  All of the patients who underwent orthognathic surgery in 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 the mandibular movements. The patient sample comprised 80 patients (37 males; and 43 females) at the end of growth. The electromyographic instruments used in the study included a Freely and a K6-I electromyography. Statistical evaluation was carried out with the Student's t-tests for independent samples.
  
  
  RESULTS
  There are many differences between the skeletal Class II and skeletal Class III patients that are shown through the analysis of these data obtained. In the beginning phases of the treatment the muscular activities were higher in the Class II patients than in the Class III patients. Nevertheless this difference was reversed at the end of the treatment. A similar difference could be found in the mandibular kinesiology, in fact the maximum mandibular opening movement was greater in the skeletal Class II patients than in the skeletal Class III patients at the beginning of the treatment. At the end of the treatment this difference was lost. At the beginning of the treatment the Class II patients showed a greater protrusive movement of the mandibular than the Class III patients. At the end the treatment however this gap was reduced without being reversed.
  
  
  CONCLUSIONS
  Functional evaluation in patients in surgical orthodontic therapy is an important element in the diagnostic-therapeutic recordings, so as to reduce as much as possible any incorrect neuromuscular activity that can result in relapse.
authors.affiliation: IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Department of Orthodontics, University of Milan, Italy. giampietro.farronato@unimi.it
authors.forename: Giampietro
authors.initials: G
authors.lastname: Farronato
authors.forename: Lucia
authors.initials: L
authors.lastname: Giannini
authors.forename: Guido
authors.initials: G
authors.lastname: Galbiati
authors.forename: Giulia
authors.initials: G
authors.lastname: Sesso
authors.forename: Cinzia
authors.initials: C
authors.lastname: Maspero
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D007734:Kymography; D008297:Male; D008312:Malocclusion, Angle Class II / Q000601:surgery* / Q000628:therapy; D008313:Malocclusion, Angle Class III / Q000601:surgery* / Q000628:therapy; D008334:Mandible / Q000502:physiology*; D008410:Masticatory Muscles / Q000502:physiology*; D009068:Movement; D016059:Range of Motion, Articular; D013704:Temporomandibular Joint / Q000502:physiology*