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The aim of this study is to compare to different protocols to treat Class II malocclusion in growing subjects using the twin block appliance
Patients will be clinically and radio-graphically examined for eligibility
Eligible patients will be randomly assigned to one of two groups:
Records will be taken and impressions will be made and poured. In the control group, bite registration will be made with maximum mandibular advancement. In the intervention group, bite registration is made to habitual bite to make a modified twin block.
Patients will be recalled every 6 weeks for 8 months for monitoring and reactivation of the appliance.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Maximum Bite Advancement | Active Comparator |
| |
| Incremental Bite Advancement | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Modified Twin Block | Device | a modified twin block design including jack screws to facilitate incemental advancement |
|
| Measure | Description | Time Frame |
|---|---|---|
| To asses Skeletal and dentoalveolar changes in Mandible | Cone Beam CT will be taken before and after active treatment, 3D Cephalometric analysis will be conducted on the Cone Beam to asses Skeletal and Dentoalvoelar changes in mandible. - changes that will be assesed include ( mandibular base length / mandibular antero posterior position in relation to cranial base/ Condylar position / lower incisor inclination to mandibular plane) | 8 Months |
| To asses patient compliance | patient will answer a questionnaire at end of treatment | 8 months |
| Measure | Description | Time Frame |
|---|---|---|
| To asses Skeletal and dentoalveolar changes in Maxilla |
|
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Inclusion Criteria:
Exclusion Criteria:
biological growing female
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Khaled M. Hussein, B.D.S | Contact | +201558332038 | Khaled.ali@dentistry.edu.eg | |
| Sahar Taher, PhD | Contact | Staher@yahoo.com |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Faculty of Dentistry, Cairo University | Cairo | Egypt |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 2773861 | Background | DeVincenzo JP, Winn MW. Orthopedic and orthodontic effects resulting from the use of a functional appliance with different amounts of protrusive activation. Am J Orthod Dentofacial Orthop. 1989 Sep;96(3):181-90. doi: 10.1016/0889-5406(89)90454-x. | |
| 15520691 | Background | Banks P, Wright J, O'Brien K. Incremental versus maximum bite advancement during twin-block therapy: a randomized controlled clinical trial. Am J Orthod Dentofacial Orthop. 2004 Nov;126(5):583-8. doi: 10.1016/j.ajodo.2004.03.024. |
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no plan to share data
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| ID | Term |
|---|---|
| D008844 | Micrognathism |
| ID | Term |
|---|---|
| D007569 | Jaw Abnormalities |
| D007571 | Jaw Diseases |
| D009140 | Musculoskeletal Diseases |
| D019767 | Maxillofacial Abnormalities |
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Type: Two arm, parallel, randomized clinical trial. allocation ratio 1:1 framework: superiority
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Assessor will carry out measurements blindly on pre-operative and post-operative radio-graphs
| Twin Block Appliance set to maximum bite | Device | a traditional twin block set to maximum bite advancement at start of treatment |
|
| 8 months |
| D019465 |
| Craniofacial Abnormalities |
| D009139 | Musculoskeletal Abnormalities |
| D009057 | Stomatognathic Diseases |
| D018640 | Stomatognathic System Abnormalities |
| D000013 | Congenital Abnormalities |
| D009358 | Congenital, Hereditary, and Neonatal Diseases and Abnormalities |