An observational study in Epidemiological Investigation and Malocclusion, sponsored by Shanghai Jiao Tong University School of Medicine. Not yet recruiting. Open to participants aged 4 Years to 20 Years. Per ClinicalTrials.gov, last updated 2025-05-14.
Sponsored by Shanghai Jiao Tong University School of Medicine · Observational
Malocclusion is a kind of craniomaxillofacial complex deformity caused by heredity, environment, bad habits, trauma, inflammation, tumor and aging. Notably, the last comprehensive national prevalence data on malocclusion in China, which encompassed a significant sample size, dates back over two decades. Given the evolving nature of these epidemiological metrics, such as prevalence rates, it is imperative to update our understanding. Consequently, there is an urgent need for China to undertake a unified, standardized epidemiological survey of malocclusion with a substantial sample size to ensure accurate and timely data collection.
With the improvement of our country's living and cultural level, orthodontic treatment for malocclusion has emerged as a critical need that significantly impacts individuals' physical and mental wellbeing, as well as their social life in contemporary society. To obtain the prevalence rate, demand index and risk factor analysis of malocclusion in China serves as a fundamental prerequisite for effective diagnosis, identifying the optimal treatment window, and devising tailored treatment plans.
The purpose of this study is as follows:
The implementation of this project will not only foster an improvement in the overall oral health of the populace but also establish a scientific foundation for oral medicine research and the development of prevention and treatment strategies.
323 studies on the registry are indexed under Malocclusion; 85 are open to participants now.
This study's planned enrollment of 19,847 is above the median of 63 across 74 observational studies indexed under Malocclusion.
Browse Malocclusion studies →Shanghai Jiao Tong University School of Medicine is the lead sponsor of 374 studies on the registry; 110 are open to participants now.
Counted across the registry records on this site, refreshed daily.
The study included four age groups: students aged 4-6 years (senior grade of kindergarten),9-11 years (fourth grade in primary school),13-15 years (eighth grade),and 17-20 years (freshman in college).
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.
Exclusion Criteria:
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.
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.
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.
This is a non intervention-observation only study.
This is a non intervention-observation only study.
This is a non intervention-observation only study.
This is a non intervention-observation only study.
The Prevalence rate of malocclusion
The Index of Orthodontic Treatment Need and Dental Aesthetic Index were used to record the Malocclusion deformities,The Index of Orthodontic Treatment Need or Dental Aesthetic Index ≥3 is recorded as Malocclusion.The prevalence rate of malocclusion was the number of cases of Malocclusion /the total number of investigated cases during the research investigation.
Time frame: recruitment until December 2026
Dental Aesthetic Index of each age group
Fill in the questionnaire through clinical examination,then calculate Dental Aesthetic Index according to the results of the questionnaire
Time frame: recruitment until December 2026
Index of Orthodontic Treatment Need of each age group
Fill in the questionnaire through clinical examination,then calculate Index of Orthodontic Treatment Need according to the results of the questionnaire
Time frame: recruitment until December 2026
dietary habit
Questionnaire survey
Time frame: recruitment until December 2026
oral hygiene habits
Questionnaire survey
Time frame: recruitment until December 2026
Bad oral habit
Questionnaire survey
Time frame: recruitment until December 2026
No study locations are listed for this record.
Plan to share: No
No publications or documents are linked to this record.
Start is estimated for May 2025; primary completion for Dec 2026, 19 months later.
How these figures are worked out, and which studies are left out of them.
This study is not yet recruiting, as verified in Apr 2025. You cannot join it, but the record below documents what was studied.
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Shanghai Jiao Tong University School of Medicine →