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This study investigated treatment effects and stability of anterior open bite cases using extrusion arches
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| AOB adults | Experimental | adult patients over 18 years having an anterior open bite of more than 2 mm, requiring incisors extrusion |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| extrusion arch | Device | A stainless steel pre-formed arch wire custom made by placing V-bends 3-5 mm mesial to the molar tubes, placed into the auxiliary molar tubes after leveling phase and tied over the main arch wire distal to the lateral incisors |
| Measure | Description | Time Frame |
|---|---|---|
| SNA angle | The anteroposterior position of maxillary base to the anterior cranial base. | 18 months |
| SNB angle | The anteroposterior position of mandibular base to the anterior cranial base. | 18 months |
| ANB angle | The anteroposterior position of maxillary base to the mandibular base. | 18 months |
| SN-MP angle | Mandibular plane angle, the angle between the mandibular plane (Go-Me) and anterior cranial base plane (SN). | 18 months |
| PP-MP angle | The angle between palatal plane (ANS-PNS) and mandibular plane. | 18 months |
| AFH | Anterior facial height, the measurement between Nasion (N) and Menton (Me). | 18 months |
| interincisal angle | - The inner angle between the long axis of the maxillary central incisor and long axis of mandibular central incisor. | 18 months |
| L1 to MP in mm | - The perpendicular distance between the most anterior mandibular central incisor and mandibular plane. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| tasneem hammad, BDS | Alexandria University | Principal Investigator |
| hanan ismail, PHD | Alexandria University | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Alexandria faculty of Dentistry | Alexandria | 21589 | Egypt |
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Before and after design
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| 18 months |
| L1 to MP angle | The angle between long axis of the most anterior central incisor and the mandibular plane. | 18 months |
| overbite | Vertical distances between the incisal edges of the maxillary and mandibular central incisors, perpendicular to N-Me. | 18 months |
| U1 to PP angular and linear measurements | -The angle and perpendicular distance between long axis of the most anterior upper central incisor and the Palatal plane (ANS-PNS). | 18 months |
| u6 to pp angle | -The angle between the axis between mesial cusp tip and mesiobuccal root apex of the upper first molar and the palatal plane. | 18 months |
| U6 to PP in mm | -The perpendicular distance between the mesial cusp tip of the upper first maxillary molar and the palatal plane. | 18 months |
| L6 to MP angle | The angle between the axis between mesial cusp tip and mesial root apex of the lower first molar and the mandibular plane. | 18 months |
| L6 to MP in mm | The perpendicular distance between mesial cusp tip of the lower first molar and the mandibular plane. | 18 months |