الفهرس 
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Abstract
The present study was conducted to evaluate the effect of maxillary molar intrusion by miniscrews anchorage on the dento-skeletal structures of the face. In this study, fifteen adult patients (13 female and 2 males) with age ranged from 14-23(mean age of 18.1, ±2.03 SD) years were selected to participate in this prospective clinical trial. Bands were seated on the posterior teeth of the maxillary arch and after leveling and alignment, the bands were connected together with two trans-palatal arches to fabricate the appliance used in intrusion. A self drilling titanium alloy miniscrews (1.8 mm in diameter and 8 mm in length) were inserted into the buccal alveolar bone on each side. By using a memory power chain, 300 gram of force was applied from the appliance to the miniscrews until sufficient intrusion had been achieved. After intrusion, the post intrusion records were taken and analyzed to evaluate the dental and skeletal changes. The data analyzed showed that the maxillary posterior teeth were intruded significantly by about 2.8 mm that in turn caused auto-rotation of the mandible that resulted in open bite correction. So, from the results of the present study, the followings can be concluded:- Anterior open bite was corrected efficiently by mandibular auto-rotation by using segmental technique with buccally placed miniscrews. -True molar intrusion was performed by using miniscrews as skeletal anchorage during intrusion. Miniscrews were effective, minimally invasive, well tolerated by the patients and provided a stable skeletal anchorage throughout the study, so that, it can be considered a good alternative for orthogenetic surgery in borderline cases.