الفهرس 
COVEROnly 14 pages are availabe for public view
 |  | from | 270 |  |  |
| | | from | 270 | | |
Abstract
This prospective randomized clinical trial study was carried out to clinically evaluate and compare the intrusion effectiveness and efficiency of mini-screw implants versus conventional CIA intrusion arches on the maxillary incisors and other skeletal, dentoalveolar and soft tissue structures from cephalometric measurements in an attempt to highlighten their ideal clinical implication.
In addition to the main aim, this study was also sought to assess and evaluate the amount of root resorption caused by the two different intrusion modalities and investigate the correlation between duration of maxillary incisors intrusion and root resorption via the aid of 3D cone beam computed tomography. Furthermore, the changes in the vertical and horizontal position of maxillary incisors were assessed by 3D models superimposition of the pre-intrusion and post-intrusion CBCT.
The sample in this study consisted of twenty Egyptian females each exhibiting an anterior deep overbite with either Class I or Class II malocclusions.
The subjects were equally and randomly divided into two groups; Group A (Mini-screw implants group) whose mean age was 20.9 ± 2.6 years, and Group B (Connecticut intrusion arch CIA) whose mean age 21.2 ± 2.2 years.For each subject a standard full set of orthodontic records were taken,in addition to a3D CBCT pre-intrusion (T1) and post-intrusion (T2).
After completion of leveling and satisfactory alignment of the arches, the maxillary arch was divided into three stabilizing segments. The bilateral posterior segments extended from the premolars to the first permanent molars, while the anterior segment involving the four incisors.
A two point of force application distal to the lateral incisors was applied, so that the force vector would pass through the center of resistance of the four incisors which is located distal and apical to the roots of lateral incisors in an attemptto achieve a pure intrusion of the anterior segment.
All subjects were recalled every three weeks for follow up and intrusive force reactivation.Evident improvements in deep overbite were obvious after an average of four months of intrusion with mini-screw implants and six months with CIA intrusion arches.
The obtained data were tabulated and statistically analyzed using the SpSS program “statistical package for social sciences”.