Quantitative Evaluation of Attention to Faces After Orthognathic Surgery With Eye-tracking
NCT Number: NCT06494709
Acronym: OCHIRO
Status: RECRUITING
Study Type: INTERVENTIONAL
Phases: NA
Conditions: Dentofacial Deformities|Orthognathic Surgery|Social Perception|Eye Tracking
Interventions: OTHER: photographs
Sponsor: Centre Hospitalier Universitaire, Amiens
Collaborators: Institut Faire Faces
Sex: ALL
Age: ADULT, OLDER_ADULT
Enrollment: 60
Study Design: Allocation: NA|Intervention Model: SINGLE_GROUP|Masking: NONE|Primary Purpose: OTHER
Start Date: 2024-07-02
Completion Date: 2026-08
Locations: Amiens University Hospital, Amiens, Picardie, 80054, France

Summary:
Dentofacial deformities refer to morphological anomalies of the jaws. Their development during growth determines the shape of the lower third of the face and the type of dental occlusion. A maxillo-mandibular dysmorphosis associates morphological modification of the face and anomaly of the occlusion. If these anomalies are most often hereditary, they also depend on acquired factors such as swallowing, breathing, sucking or phonation disorders. Angle's classification defines three classes of dental occlusion: class I, when the ratio between the maxillary and mandibular first molars is normal, class II when the upper molar is too far forward, and class III when it is too far back. Class II and III dysmorphoses can result in an alteration of the masticatory function, pain (TMJ, headaches) or sleep apnea. At the same time, they cause patients to experience a decrease in self-esteem, anxiety and social discomfort. Class II and II usually require orthodontic treatment and orthognathic surgery to correctly align the jaws. This surgery has a positive impact on the dental occlusion and the functions concerned, but also on the facial morphology, all of which often leads to an improvement in the patient's quality of life.

Standardized photographs presenting control subjects (class I) and patients (class II and class III) before and after surgery will be included in an approximately 10 min video sequence. Naive participants will look at this sequence during which the faces of the controls and the patients - before and after surgery - will alternate, with the instruction being free visual exploration of the images. The total fixation durations in defined areas of interest (eyes, nose, mouth, chin) will be recorded with an eye tracking device and the results will be processed using a dedicated software.

Primary Outcome Measures: Total fixation duration in the "lower third of the face (mouth/chin)" area of interest, Total fixation duration in the "lower third of the face (mouth/chin)" area of interest, measured in seconds with eye-tracking technique, one day
Secondary Outcome Measures: Total fixation duration in the "eyes" area of interest, Total fixation duration in the "eyes" area of interest, measured in seconds with eye-tracking technique, one day|Total fixation duration in the "nose"" area of interest, Total fixation duration in the "nose" area of interest, measured in seconds with eye-tracking technique, one day|Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in patients before orthognathic surgery compared to control subjects., Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in patients before orthognathic surgery compared to control subjects.

measured in seconds with eye-tracking technique, one day|Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in patients after orthognathic surgery compared to control subjects., Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in patients after orthognathic surgery compared to control subjects.

measured in seconds with eye-tracking technique, one day|Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in class II patients before orthognathic surgery compared to class III patients., Total fixation duration in the eyes", the "nose" and the "lower third of the face (mouth/chin)" areas of interest in in class II patients before orthognathic surgery compared to class III patients.

measured in seconds with eye-tracking technique, one day