An interventional study of language in Malocclusion, Angle Class II and Malocclusion, Angle Class III, sponsored by Linyu Xu. Enrolling by invitation at 1 site in China. Open to participants aged 18 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-05-22.
Sponsored by Linyu Xu · Not applicable, Interventional, and Diagnostic
Facial aesthetics has always been a complex and subjective concept. The overall facial harmony, along with lip protrusion, which is often a focus for orthodontists, requires evaluation from multiple perspectives. The viewing angle also influences the assessment of facial aesthetics, particularly the judgment of lip protrusion. This study aims to explore the differences in facial fixation patterns and aesthetic evaluations among different populations at specific viewing angles by using digital models to simulate various perspectives.
In the analysis of facial aesthetics, the 45° profile has a unique advantage in evaluating lip protrusion, zygomatic fullness, and contour curve. Compared to the frontal view, this angle provides a more three-dimensional and deeper perspective. In a previous study, the research group found that the shape of the midface area at 45° influences the evaluation of lip protrusion. In this study, a digital model was used to simulate the protrusion of different midface areas in order to explore the differences in facial fixation patterns and aesthetic evaluations among various individuals at 45°. Based on data from individuals who showed significant improvement in frontal and profile beauty before and after clinical treatment, the study added an evaluation of beauty and lip position from the 45° profile. This aims to provide a reference for the subsequent establishment of a 45° profile analysis.
124 studies on the registry are indexed under Malocclusion, Angle Class II; 19 are open to participants now.
This study's planned enrollment of 80 is above the median of 34 across 115 interventional studies indexed under Malocclusion, Angle Class II.
Browse Malocclusion, Angle Class II studies →This is the only study on the registry with Linyu Xu as lead sponsor.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Orthodontist inclusion criteria: ① With dental doctor qualification certificate; ② At least 2 years of professional training in orthodontics.
Inclusion criteria for orthodontic patients: ① Receiving orthodontic treatment for more than 1 year; ② Volunteer to participate in the study; ③ Native language is Chinese, can understand the prompt language and normal communication.
General adult inclusion criteria: ① have not experienced orthodontic treatment or have no need for orthodontic treatment; ② Do not engage in stomatology industry, have not studied stomatology specialty; ③ Native language is Chinese, can understand the prompt language and normal communication.
Exclusion Criteria:
① have visual impairment (such as color blindness, high myopia); ②Have psychological problems (such as autism, schizophrenia); ③ Recent use of alcohol, or long-term fatigue, anxiety; Current use of any medication that may affect cognitive ability; ⑤ Use mascara, contact lenses or small frame height glasses
This phase of the experiment serves as baseline data without language intervention.
In this phase of the experiment, participants are given language cues to intervene in their eye movement.
Behavioral: language
Language cues are used to provide participants with psychological suggestions in order to achieve the goal of shifting their focus in gaze patterns.
Total fixation duration of area of interest
The facial images used as stimulus materials are divided into several regions, with the fixation duration in each area of interest serving as the primary measurement. Changes in fixation duration represent a shift in the focus of attention.
Time frame: The duration of the experiment for each participant does not exceed 10 minutes. A random selection of 10 participants will immediately undergo a repeat experiment after the first round to verify the reliability of the participants.
Eye movement track
The specific patterns of attention shift will be further observed through the changes in eye-tracking trajectories.
Time frame: The duration of the experiment for each participant does not exceed 10 minutes.A random selection of 10 participants will immediately undergo a repeat experiment after the first round to verify the reliability of the participants.
Plan to share: No — There are concerns about excessive patient privacy intrusion, and some patients are unwilling to provide all the requested information, such as unmasked facial data and other sensitive details.
No publications or documents are linked to this record.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
No contact was published for this record. The registry link below has the sponsor’s details.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Malocclusion, Angle Class II →