An interventional study of photographs in Dentofacial Deformities, Orthognathic Surgery and Social Perception, sponsored by Centre Hospitalier Universitaire, Amiens. Recruiting at 1 site in France. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-08.
Sponsored by Centre Hospitalier Universitaire, Amiens · Not applicable, Interventional, and Other
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.
40 studies on the registry are indexed under Dentofacial Deformities; 16 are open to participants now.
This study's planned enrollment of 60 is above the median of 40 across 25 interventional studies indexed under Dentofacial Deformities.
Browse Dentofacial Deformities studies →Centre Hospitalier Universitaire, Amiens is the lead sponsor of 586 studies on the registry; 185 are open to participants now.
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Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
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You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Standardized photographs presenting 10 control subjects (class I) and patients with dentofacial deformities (10 class II and 10 class III) before and after surgery - from the front and from the side - will be used to form an approximately 10 min video sequence using the Tobii Pro Lab® software (Tobii Pro AB, Danderyd, Sweden). The naive participants will look at the percept during which the faces of the controls and the patients will alternate, with the only instruction being free visual exploration of the percept. The fixation duration in the defined areas of interest (eyes, nose, mouth, chin) will be recorded with a Tobii® Pro X3-120 eye-tracking device and the results will be processed with the Tobii Pro Lab® software.
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
Time frame: one day
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
Time frame: 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
Time frame: 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
Time frame: 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
Time frame: 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
Time frame: one day
Plan to share: No
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