title: Comparative study using video analysis and an ultrasonic measurement system to quantify mandibular movement.
abstract: OBJECTIVE
  This study provides a direct comparison between two registration systems used in quantifying mandibular opening movements: two-dimensional videography and electronic axiography, which is used as a reference.
  
  
  METHODS
  A total of 32 volunteers (age: 27.2 ± 6.8 - gender: 17 F - 15 M) participated in the study and repeated a characteristic movement, the frontal Posselt, used in the clinical evaluation of the temporomandibular joint.
  
  
  RESULTS
  Frontal Posselt diagrams were reconstructed with the data gathered from both systems, which yielded acceptably similar data. Three commonly assessed parameters were obtained from each diagram and compared. These parameters were: maximum opening, right laterotrusion and left laterotrusion. Both descriptive statistics and the ANOVA test suggested that there was no significant difference between the estimated maximum opening parameter and the reference system (p = 0.217, 95% confidence). Laterotrusion values, on the other hand, appear to be overestimated by videography system and to show greater variability.
  
  
  CONCLUSIONS
  Two-dimensional videography appears to be a suitable tool with resolution that is adequate for tracing mandibular movements - and opening values, in particular - for screening purposes, long-term observation, and as a quick check for dysfunction as far as frontal plane trajectories are concerned.
  
  
  CONCLUSIONS
  Reliability and acceptable quality of 2D videography data, acquired in this work, show that it has clear advantages for its wide application in the dental office due to simplicity and low cost for maximum opening measurement given the usefulness of this parameter in the detection of temporomandibular disorders.
authors.affiliation: a Faculty of Engineering, Biomechanics Laboratory , National University of Entre Ríos , Oro Verde , Argentina.
authors.forename: M
authors.initials: M
authors.lastname: Frisoli
authors.affiliation: b Department of Prosthetic Dentistry , Göttingen Medical School, Universitätsmedizin Göttingen , Göttingen , Germany.
authors.forename: J M
authors.initials: JM
authors.lastname: Edelhoff
authors.affiliation: b Department of Prosthetic Dentistry , Göttingen Medical School, Universitätsmedizin Göttingen , Göttingen , Germany.
authors.forename: N
authors.initials: N
authors.lastname: Gersdorff
authors.affiliation: a Faculty of Engineering, Biomechanics Laboratory , National University of Entre Ríos , Oro Verde , Argentina.
authors.forename: J
authors.initials: J
authors.lastname: Nicolet
authors.affiliation: a Faculty of Engineering, Biomechanics Laboratory , National University of Entre Ríos , Oro Verde , Argentina.
authors.forename: A
authors.initials: A
authors.lastname: Braidot
authors.affiliation: b Department of Prosthetic Dentistry , Göttingen Medical School, Universitätsmedizin Göttingen , Göttingen , Germany.
authors.forename: W
authors.initials: W
authors.lastname: Engelke
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007574:Jaw Relation Record / Q000379:methods; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D009068:Movement / Q000502:physiology; D016059:Range of Motion, Articular; D012016:Reference Values; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging / Q000503:physiopathology; D014465:Ultrasonics / Q000295:instrumentation / Q000379:methods*; D014741:Video Recording / Q000295:instrumentation / Q000379:methods*
keywords: 2D Videography; Jaw movement; Kavo ARCUSdigma®; Maximum opening; Temporomandibular joint