Crowding clinical trials
The registry lists 88 studies for Crowding across more than 10 countries. 22 are recruiting or about to start. 62 of them are mainly about Crowding (how this is decided). Per ClinicalTrials.gov, last updated 2026-11-10.
Get an email when these change. Save the Crowding studies recruiting or about to start — once a week, free: studies that open, close, add sites or post results.
See an example email
Example · made-up studies
Breast cancer · Recruiting: 2 came in, 3 changed
What changed in your saved searches, Oct 31 – Nov 6:
A study of drug A after surgery for early breast cancer
Came in · now Recruiting
Drug B with hormone therapy in advanced breast cancer
Changed
· Sites: 4 added, including Seoul and Busan
· Enrollment: 300 → 450 participants
Exercise during chemotherapy
Now Active, not recruiting
One email a week for all your saved searches. Stop any time.
Status
Who runs them
Damascus University (19) · University of Baghdad (5) · Cairo University (5) · Future University in Egypt (4) · Al-Azhar University (3) · Ain Shams University (2) · Foundation University Islamabad (2) · Izmir Katip Celebi University (1)
Coming up
Studies recruiting or running, from their records. “Main data collection” ends at the primary completion date, the sponsor’s own estimate, which often moves.
The 10 nearest
- Nov 2026Treatment Outcome of Elastomeric and Nickel-Titanium Separators in Tooth Separation · 3D-Aligners
- Dec 2026A Comparative Study Between Modified Miniscrew-Assisted Rapid Palatal Expander And Modified Rapid Palatal Expander in Molar Distalization Using Cone- Beam Computed Tomography · Al-Azhar University
- Jan 2027Accuracy and Time Efficiency of AI Versus Manual Segmentation in Adult Crowding Using Aligner Software · Dina ahmed
- Jan 2027Interceptive Maxillary Expansion to Relief Anterior Crowding in the Mixed Dentition · Region Örebro County
- Feb 2027Validity of Ashley Howe's Analysis for the Prediction of the Extraction Treatment Decision in Orthodontic Patients at the Permanent Dentition Stage · Cairo University
- Mar 2027Treatment of the Mandibular Dental Crowding With and Without Corticotomy Surgery · Ardentis Cliniques Dentaires
- Mar 2027Exploration of the Utility of Dental-dedicated MRI for Dentistry · University of Minnesota
- Apr 2027The Predictability of Directly Printed Versus Thermoformed Clear Aligners · University of Baghdad
- May 2027Evaluating the Efficacy of Micro-Osteoperforations Technique on the Orthodontic Tooth Movement Acceleration in Moderate Mandibular Anterior Crowding Cases Treated With Clear Aligners · Hama University
- Jul 2027Evaluation of Intraoral Scanning vs Conventional Impression in Assessing Dental Crowding · Cairo University
Who these studies take
Of the 11 Crowding studies recruiting now, 5 (45%) set no upper age limit and 6 (55%) stop at 75 or younger. 6 (55%) take children under 18. 0 (0%) are for women only and 0 (0%) for men only; 5 (45%) take healthy volunteers.
| Age | Women | Men |
|---|---|---|
| 10 | 2 (18%) | 2 (18%) |
| 18 | 9 (82%) | 9 (82%) |
| 30 | 8 (73%) | 8 (73%) |
| 40 | 6 (55%) | 6 (55%) |
| 50 | 6 (55%) | 6 (55%) |
| 65 | 5 (45%) | 5 (45%) |
| 75 | 5 (45%) | 5 (45%) |
| 85 | 5 (45%) | 5 (45%) |
Across all 88 studies, recruiting or not: 74% stop at 75 or younger and 73% at 65; 58% take children; 2% are for women only and 0% for men only; 38% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.
How long Crowding studies take
Of 52 interventional studies with no phase under Crowding, half reached primary completion within 17 months of starting, counting those still running.
| Start to primary completion | Every sponsor | Industry | Non-industry |
|---|---|---|---|
| Interventional, no phase | 17 mo11–28 · 52 studies | — | 17 mo11–28 · 50 studies |
Each figure is the month by which half the studies had reached primary completion, with the range in which the middle half did. Studies still running count until their last registry update; studies that stopped early are left out. Phase 1 includes early phase 1; observational means prospective or not stated, as retrospective and cross-sectional studies date a window of data rather than a study. How these figures are worked out
What changed recently
From the registry's own updates since Oct 11, 2026.
Newly registered4
- Evaluation of Intraoral Scanning vs Conventional Impression in Assessing Dental CrowdingNov 10, 2026NCT07928869
- Accuracy and Time Efficiency of AI Versus Manual Segmentation in Adult Crowding Using Aligner SoftwareNov 5, 2026NCT07919652
- Timing, Trajectories and Prediction in Severe Dental Crowding: The Create SPACE (cSPACE)Nov 2, 2026NCT07911176
- Self-ligating vs Conventional Brackets and Labial Bone Thickness During Crowding Correction in AdultsOct 16, 2026NCT07878234
Studies
Recruiting first, then most recently updated. Showing 50 of 88. Browse all 88 → or search them.
- Evaluation of Intraoral Scanning vs Conventional Impression in Assessing Dental CrowdingNot yet recruitingNCT07928869
- Timing, Trajectories and Prediction in Severe Dental Crowding: The Create SPACE (cSPACE)Not yet recruitingNCT07911176Not applicable
- Bracketless Orthodontic Treatment (3D-BOT) Versus Conventional Fixed Braces for Mild-to-Moderate Lower Front Tooth Crowding in AdultsNot yet recruitingNCT07897864Not applicable1 country
- Evaluating the Efficacy of Micro-Osteoperforations Technique on the Orthodontic Tooth Movement Acceleration in Moderate Mandibular Anterior Crowding Cases Treated With Clear AlignersRecruitingNCT05492773Not applicable1 country
- Exploration of the Utility of Dental-dedicated MRI for DentistryRecruitingNCT069481621 country
- Efficiency, Efficacy, Periodontal & Occlusal Outcomes for Aligners Versus Fixed Orthodontic Appliances in Crowded Incisor TreatmentEnrolling by invitationNCT06731465Not applicable1 country
- Effect of Different Adhesive Systems on White Spot Lesions During Fixed Orthodontic TreatmentNot yet recruitingNCT07753512Not applicable1 country
- Digital Anticipatory Protocols at Triage to Improve ED Flow.RecruitingNCT077261081 country
- Orthodontic Treatment Outcomes of Self Ligating System Compared to Clear Aligner SystemNot yet recruitingNCT07638397Not applicable1 country
- Validity of Ashley Howe's Analysis for the Prediction of the Extraction Treatment Decision in Orthodontic Patients at the Permanent Dentition StageRecruitingNCT076601461 country
- Clinical Performance of Direct-Printed Versus Thermoformed AlignersRecruitingNCT07637227Not applicable1 country
- Treatment Outcome of Elastomeric and Nickel-Titanium Separators in Tooth SeparationNot yet recruitingNCT07591454Not applicable
- Clinical Performance of the I-arch System During the Initial Stage of Orthodontic TreatmentRecruitingNCT07264127Not applicable1 country
- The Predictability of Directly Printed Versus Thermoformed Clear AlignersEnrolling by invitationNCT07350343Not applicable1 country
- Evaluation of Accuracy of 3D Printed Aligners in Comparison to Thermoformed Aligners in Orthodontic PatientsNot yet recruitingNCT07496892Not applicable1 country
- Accuracy and Periodontal Outcomes of Three Interproximal Enamel Reduction Techniques During Clear Aligner TherapyNot yet recruitingNCT07377825Not applicable1 country
- Evaluating the Clinical Efficacy of Collagen Scaffold (Ossix VOLUMAX) With Piezo-Surgical Decortication in Enhancing Orthodontic Treatment Outcomes: A Randomized Controlled TrialRecruitingNCT07097714Not applicable1 country
- Interceptive Maxillary Expansion to Relief Anterior Crowding in the Mixed DentitionRecruitingNCT06187337Not applicable2 countries
- Evaluation of DPA for Treatment of Upper Anterior CrowdingNot yet recruitingNCT06625658Not applicable1 country
- Hyrax Vs. Invisalign Palatal Expander Clinical StudyRecruitingNCT06662279Not applicable1 country
- Acutelines: a Large Data-/Biobank of Acute and Emergency MedicineRecruitingNCT046150651 country
- Clinical Effectiveness of Damon Ultima Vs Conventional Brackets Trial)RecruitingNCT05978817Not applicable1 country
- Accuracy and Time Efficiency of AI Versus Manual Segmentation in Adult Crowding Using Aligner SoftwareActive, not recruitingNCT079196521 country
- Treatment of the Mandibular Dental Crowding With and Without Corticotomy SurgeryActive, not recruitingNCT03967002Not applicable1 country
- Self-ligating vs Conventional Brackets and Labial Bone Thickness During Crowding Correction in AdultsCompletedNCT07878234Not applicable1 country
- A Prospective , Split-mouth, Clinical Study of Orthodontic Titanium Miniscrews With Machined and Acid-etched Surfaces.CompletedNCT07662434Not applicable1 country
- Clear Aligners With Two Different Change Schedules vs Traditional Braces for People With Crowded Lower Front TeethCompletedNCT07821723Not applicable1 country
- Length of Stay in Emergency Department: Impact of Anticipated Blood Sampling (LEIA)CompletedNCT077696451 country
- The Reliability and Validity of Little's Irregularity Index AssessmentCompletedNCT077458551 country
- Bone Level Changes Using Clear Aligners Compared to Fixed Appliances in Non-Extraction Treatment of AdultsCompletedNCT07716007Not applicable1 country
- A Study to Evaluate the Relationship Between Two Bracket System and Their Contribution to Initial Alignment of Maxillary Anteriors - De Crowding, Smile Arc Protection.CompletedNCT07712055Not applicable1 country
- Bracket Positioning Techniques and Quality of Orthodontic FinishingCompletedNCT07708363Not applicable1 country
- To Compare the Effects of Lip Bumper Appliance in Rate of Lower Incisor Alignment After First Premolar ExtractionsCompletedNCT06929754Not applicable1 country
- A New Crowding Indicator in the Emergency DepartmentActive, not recruitingNCT071116241 country
- Telemedicine-Based Emergency Physician Assessment Prior to ED Entry: A Randomized Controlled TrialCompletedNCT07546071Not applicable1 country
- Comparison of Alignment Efficiency, Arch Dimensional Changes, and Passive Extraction Space Closure Between Self-Ligating and Conventional BracketsCompletedNCT07503314Not applicable1 country
- Shape Memory Orthodontic AlignersCompletedNCT07431333Not applicable1 country
- Evaluation of Dentoalveolar Changes of Clear Aligners Versus Fixed Orthodontic Appliances on Skeletal Class I Non-extraction Patients With Dental CrowdingActive, not recruitingNCT07090746Not applicable1 country
- Factors Affecting Attachment Loss in Clear Aligner TreatmentCompletedNCT07352644Not applicable1 country
- Repeated Injections of i-PRF for Decreasing Root Resorption After the Orthodontic Treatment.CompletedNCT07352241Not applicable1 country
- A Comparative Study Between Modified Miniscrew-Assisted Rapid Palatal Expander And Modified Rapid Palatal Expander in Molar Distalization Using Cone- Beam Computed TomographyActive, not recruitingNCT07038902Not applicable1 country
- Effects of Micro-osteoperforations on Lower Anterior Crowding Using Clear AlignersActive, not recruitingNCT07169968Not applicable1 country
- Early Orthodontic Treatment of Dental CrowdingActive, not recruitingNCT04756843Not applicable1 country
- Birth Complications and Intrauterine Constraints in the Etiology of Congenital Muscular Torticollis: A Nationwide Registry StudyCompletedNCT069014141 country
- New Visual Acuity and Crowding Tests for Better Detection of AmblyopiaCompletedNCT03505606Not applicable1 country
- Nicotine as an Adjuvant Analgesic for Third Molar SurgeryCompletedNCT00385216Phase 41 country
- Evaluation of Treatment Outcome of Lower Incisors Crowding Using Clear Aligners With Laser Acceleration .CompletedNCT06526871Not applicable1 country
- Clear Aligner Treatment With and Without Low Level Laser Therapy for Upper Incisor CrowdingCompletedNCT06493721Not applicable1 country
- Comparing Labial and Lingual Orthodontic Appliances on Root Resorption and Bone HeightCompletedNCT06401369Not applicable1 country
- Oral Health-Related Quality of Life Between Two Different Types of Orthodontic AppliancesCompletedNCT06401382Not applicable1 country