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The aim of the current clinical trial was to evaluate the effects of premolar extractions compared with non-extraction orthodontic treatment on the skeletal vertical dimension of the face.
The null-hypothesis is that there is no difference in post-treatment skeletal vertical characteristics of normodivergent and hyperdivergent patients treated orthodontically with first premolar extractions compared with patients treated in non-extraction manner.
The current protocol will be submitted for partial fulfillment of the PhD requirements in Faculty of Dentistry, Cairo University.
The trial will be conducted in the outpatient clinic of the Orthodontic Department, Faculty of Dentistry, Cairo University.
Primary examination and diagnosis of the patients seeking orthodontic treatment will be performed, to select a sample of the trial.
then, final diagnosis and planing of each participant will be performed by a trained orthodontists to be sure that all patients fallen with the inclusion criteria.
Interventions will be conducted with the same orthodontist, under supervision of orthodontic professors in the Orthodontic department, Cairo University.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Extraction orthodontic treatment | Experimental | orthodontic treatment with teeth extraction |
|
| Non-extraction orthodontic treatment | Active Comparator | non-extraction orthodontic treatment |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Extraction orthodontic treatment | Device | orthodontic treatment with teeth extraction |
|
| Measure | Description | Time Frame |
|---|---|---|
| Changes in Vertical Dimension (VD) | Vertical dimension of the face will be assessed by measuring a distances in millimeters between vertical points as ANS-Me (lower facial height), also it will be measured form angles in a degrees as angle SN/MP | after 1year. Changes will be measured before the start of trial and at the end of space closing stage, which anticipated to be within 12 months of intervention |
| Measure | Description | Time Frame |
|---|---|---|
| Changes in Overbite | Distances in millimeters will be measure directly in patient mouth by using caliper it will be measured in millimeters. | 1 year . Changes will be measured before the start of trial and at the end of space closing stage, which anticipated to be within 12 months of intervention |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Hasan A Alrubaie, MSc | Contact | +201124777315 | hasan.naji@dentistry.cu.edu.eg | |
| Amira A Aboulnaga, PhD ortho | Contact | +201000505688 | amira_aboalnaga@dentistry.cu.edu.eg |
| Name | Affiliation | Role |
|---|---|---|
| Hasan A Alrubaie, MSc | Orthodontic department, Faculty of Dentistry, Cairo University | Principal Investigator |
| Amira A Aboulnaga, PhD | Orthodontic department, Faculty of Dentistry, Cairo University | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Hasan Hasan | Recruiting | Cairo | 11559 | Egypt |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 41636882 | Derived | Alrubaie HA, Aboalnaga AA, Alhammadi MS, Eldakroury AE, Aboulfotouh MH. Vertical skeletal dimension and dentoalveolar changes in extraction versus non-extraction orthodontic treatment in class I malocclusion: a non-randomized clinical trial. Clin Oral Investig. 2026 Feb 4;30(2):69. doi: 10.1007/s00784-026-06768-0. |
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it will be shareable for any researcher
within month it will be ready
no special criteria..any orthodontic researcher can access the data
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| ID | Term |
|---|---|
| D008310 | Malocclusion |
| ID | Term |
|---|---|
| D014076 | Tooth Diseases |
| D009057 | Stomatognathic Diseases |
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| ID | Term |
|---|---|
| D001915 | Braces |
| D014081 | Tooth Extraction |
| ID | Term |
|---|---|
| D009989 | Orthotic Devices |
| D009983 | Orthopedic Equipment |
| D013523 | Surgical Equipment |
| D004864 | Equipment and Supplies |
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-Interventions Intervention Group (I) Extraction treatment group. Bonding all cases will be performed by the principal investigator, then premolars extraction will be done, then installing the 1st alignment wire.
Comparator group (C):
Non-extraction group. Same orthodontist will bond all the cases and install the 1st alignment wire.
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the outcome assessor will be masked about the group of the participant during the measuring the outcome ..
| Non-extraction orthodontic treatment | Device | Non-extraction orthodontic treatment |
|
|
| Mai H Aboulfotouh, PhD | Orthodontic department, Faculty of Dentistry, Cairo University | Study Director |
| Amr E El dakroury, Prof. | Orthodontic department, Faculty of Dentistry, Cairo University | Study Chair |
| D019647 |
| Oral Surgical Procedures |
| D013514 | Surgical Procedures, Operative |
| D003813 | Dentistry |