title: Evaluation of malocclusion in MPDS.
abstract: BACKGROUND
  Myofascial pain dysfunction syndrome (MPDS) is a disorder which is characterized by facial pain and limited mandibular function because of the complex nature of this disease. Malocclusion was never evaluated in MPDS patients to know its role. Electromyographic silent period durations of masseter were used for objective assessment of MPDS patients.
  
  
  OBJECTIVE
  To evaluation of role of malocclusion in MPDS patients and also to study the EMG masseteric silent period pattern in MPDS patients in different malocclusions.
  
  
  METHODS
  Two groups, groups I and II of 75 subjects each, were included in this study. Groups I and II constituted the normal subjects and MPDS patients respectively. All these subjects in both the groups were again subdivided based on Angle's class I, II and III malocclusion. Electromyographic (EMG) silent period of masseteric muscle on both sides was measured for all the subjects in both the groups to know whether it differs according to the type of malocclusion.
  
  
  RESULTS
  The silent period was more in group II (MPDS patients). There was no signifcant difference in the silent periods in Angle's class I, II and III malocclusion in group I, whereas in group II, there was a signifcant difference in the silent period in Angle's class II compared to Angle's class I and III. There was no signifcant difference between males and females.
  
  
  CONCLUSIONS
  MPDS patients are more in Angle's class I malocclusion. Silent period is more in Angle's class II malocclusion of MPDS group. CLINICAL SIGNIFCANCE: The EMG masseter silent period duration can be advantageously utilized as an adjunct to clinical examination for diagnosis of myofascial pain dysfunction syndrome. It is enough if one side masseter muscle is measured for silent period duration.
authors.affiliation: Reader, Department of Orthodontics and Dentofacial Orthopaedics Hitech Dental College, Bhubaneswar, Odisha, India.
authors.forename: Kvv Pratap
authors.initials: KP
authors.lastname: Varma
authors.affiliation: Professor and Head, Department of Oral Medicine and Radiology Kalinga Institute of Dental Sciences, Patia, Bhubaneshwar, Odisha India, e-mail: rajabaskharreddy@gmail.com.
authors.forename: Raja Bhaskar
authors.initials: RB
authors.lastname: Reddy
authors.affiliation: Professor, Department of Orthodontics and Dentofacial Orthopaedics Maitri College of Dental Sciences, Durg, Chattisgarh, India.
authors.forename: S Nanda
authors.initials: SN
authors.lastname: Kishore Reddy
authors.affiliation: Professor, Department of Orthodontics and Dentofacial Orthopaedics Lenora Dental College, Rajahmundry, Andhra Pradesh, India.
authors.forename: Sita Rama
authors.initials: SR
authors.lastname: Rao
authors.affiliation: Reader, Department of Orthodontics and Dentofacial Orthopaedics Kamineni Institute of Dental Sciences, Narketpally, Andhra Pradesh India.
authors.forename: Praveen Kumar
authors.initials: PK
authors.lastname: Neela
authors.affiliation: Professor, Department of Orthodontics and Dentofacial Orthopaedics Purvanchal Institute of Dental Sciences, Gorakhpur, Uttar Pradesh India.
authors.forename: Naresh
authors.initials: N
authors.lastname: V
mesh_terms: D000293:Adolescent; D000328:Adult; D003768:Dental Occlusion, Centric; D004576:Electromyography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000150:complications* / Q000503:physiopathology; D008311:Malocclusion, Angle Class I / Q000150:complications / Q000503:physiopathology; D008312:Malocclusion, Angle Class II / Q000150:complications / Q000503:physiopathology; D008313:Malocclusion, Angle Class III / Q000150:complications / Q000503:physiopathology; D008406:Masseter Muscle / Q000503:physiopathology; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D012032:Refractory Period, Electrophysiological / Q000502:physiology; D013706:Temporomandibular Joint Dysfunction Syndrome / Q000150:complications* / Q000503:physiopathology; D055815:Young Adult