How Does Orthognathic Surgery Affect Jaw and Neck Motor Function?

Condition(s) studied

Investigational drug(s) / intervention(s)

Orthognathic surgery: Surgical corrections of the maxilla and/or the mandible. Integrated jaw-neck movement patterns, muscle activity, bite force and occlusal contact area will be registered and mapped with quantitative objective functional variables. The state-of-the-art core equipment to evaluate jaw-neck motor function in detail is located in the Movement Lab (Department of Odontology, Umeå University).

Study summary

In a prospective longitudinal study design, details in jaw-neck kinematics and electromyography (EMG) activity changes in patients (women and men) referred for surgical correction of basal relations between the maxilla and mandible over time; pre-operative and during follow-up 8 weeks and 18 months after surgical correction will be evaluated. The results will contribute with novel insights on jaw-neck motor function before, in short- and long-term after the surgical process. We will have blinded evaluation of outcomes.

Eligibility

Primary outcome measure(s)

• Change in Kinematic outcome variables — Preoperatively, postoperatively 8 weeks, 18 months
  Jaw and head movement amplitudes (mm)
• Change in Kinematic outcome variables — Preoperatively, postoperatively 8 weeks, 18 months
  Movement cycle time (s)
• Change in Kinematic outcome variables — Preoperatively, postoperatively 8 weeks, 18 months
  Movement acceleration from start to peak (mm/s2)
• Change in Kinematic outcome variables — Preoperatively, postoperatively 8 weeks, 18 months
  Jaw movement area (mm2)
• Change in Kinematic outcome variables — Preoperatively, postoperatively 8 weeks, 18 months
  Jaw movement volume (mm3)
• Change in Electromyography (EMG) — Preoperatively, postoperatively 8 weeks, 18 months
  Muscle activity in micro-Volt in jaw and neck muscles bilaterally
• Change in Maximum voluntary occlusal bite force (MVOBF) — Preoperatively, postoperatively 8 weeks, 18 months
  Newton (N)
• Change in Occlusal contact area — Preoperatively, postoperatively 8 weeks, 18 months
  mm2

Trial sites (1)

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