title: [Occupational differentiation in dentistry 3. Hypermobility of the temporomandibular joint and condylar position at maximal mouth opening].
abstract: Hypermobility of the temporomandibular joint is only noted when it interferes with smooth mandibular movements. These interferences may result from a condylar dislocation beyond the temporal eminence at maximum mouth opening. Aim of this study was to test whether the condyle of a symptomatically hypermobile temporomandibular joint is positioned more anterosuperiorly to the temporal eminence at maximum mouth opening than a condyle without hypermobility. Nine persons with a hypermobile temporomandibular joint and 9 control persons participated. Diagnostics were based upon opto-electronic mandibular movement recordings. Condylar positions at maximum mouth opening were assessed by magnetic resonance imaging. A small significant difference in condylar position was found between groups. Condyles of persons with a hypermobile temporomandibular joint moved beyond the temporal eminence. However, this was also true for nearly half of the control persons. This suggests that condylar position alone is not a sufficient condition for symptomatic hypermobility of the temporomandibular joint. Maybe, symptoms of hypermobility only become apparent in combination with a particular line of action of the masticatory muscles.
authors.affiliation: Uit de afdeling Orale Functieleer, sectie voor Orale Kinesiologie, van het Academisch Centrum Tandheelkunde Amsterdam.
authors.forename: S I
authors.initials: SI
authors.lastname: Kalaykova
authors.forename: M
authors.initials: M
authors.lastname: Naeije
authors.forename: J J R
authors.initials: JJ
authors.lastname: Huddleston Slater
authors.forename: F
authors.initials: F
authors.lastname: Lobbezoo
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007593:Joint Instability; D008297:Male; D008334:Mandible / Q000033:anatomy & histology / Q000502:physiology; D008335:Mandibular Condyle / Q000033:anatomy & histology* / Q000502:physiology; D008409:Mastication / Q000502:physiology*; D009055:Mouth / Q000502:physiology*; D009068:Movement; D016059:Range of Motion, Articular; D013701:Temporal Bone / Q000033:anatomy & histology* / Q000502:physiology; D013704:Temporomandibular Joint / Q000033:anatomy & histology / Q000502:physiology / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000473:pathology / Q000503:physiopathology*; D014716:Vertical Dimension