الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Aim: The purpose of this prospective clinical trial was to investigate the skeletal, dental, and soft tissues changes associated with the use of skeletally anchored Nickel-Titanium (Ni-Ti) extrusion arch in the treatment of anterior open bite (AOB). Materials and Methods: A total of twenty female patients with the mean age 16.5±1.5 years and a mean dentoalveolar AOB of 2.38±0.7 mm just before extrusion arch was placed were participated in this study. All patients were treated by upper 0.017×0.025-inch Ni-Ti extrusion arch with the aids of mini-screws that were inserted between upper second premolars and upper first molars bilaterally to act as indirect anchorage. Three- dimensional digital study models and lateral cephalograms were taken just before insertion of the extrusion arch (T0) and after a follow up period of 10 months (T1). Finally, data were collected and analyzed using paired-samples t-tests to evaluate the changes after treatment (T1-T0). A significance level of P < 0.05 was used. Results: AOB was successfully closed in all patients with 4.35 ± 0.61 mm increase in the overbite. Maxillary incisors were extruded significantly by 2.52 ± 1.02 mm. Also, maxillary incisors were significantly retroclined by 5.78±0.77° with resultant decrease in the overjet by 1.58± 0.5mm and increase in the interincisal angle by 9.94±1.09°. There was significant intrusion of maxillary first molars with no change in their inclination. Significant reduction in the upper arch length and upper arch perimeter by 2.09 ± 0.76mm and 1.9 ±0.87mm respectively. Significant tendency toward retraction of the upper lip relative to the E-plane with significant increase in the nasolabial angle. Conclusion: The skeletally anchored Ni-Ti extrusion arch was an effective technique in treating AOB with no adverse effects on the molars.