الفهرس 
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Abstract
Deep bite cases accompanied with gummy smile can be treated by different modalities10. Conventional intrusive arch can be used to treat these cases and can be modified by adding two miniscrews to provide support during intrusion and reduce the resulting side effects. Patients with the eligibility criteria was divided randomly into two groups. group (A) was planned to be treated by conventional intrusion arch and the group (B) to be treated with intrusive arch supported on two miniscrews. CBCT was required for all patients before intrusion and after three months to measure the linear and angular changes in each group and to compare between them by the constructed three planes in the software.
As a result, the amount of intrusion using miniscrews supported intrusion arch was greater than the amount produced by traditional intrusion arch and the amount of produced inclination during intrusion was greater in group (A) than group (B). the amount external apical of root resorption was mild in both group with less values in group (A) than group (B). She selection of the mechanism of intrusion depends on the diagnosis and objectives of treatment. The data were analysed and the differences between groups in linear and angular measurements were statistically insignificant.
Conclusions
from this study results we concluded that:
•Correction of deep bite can be performed by incisor intrusion by intrusion arch.
•The use of miniscrews to support the intrusion arch produced more intrusion and less inclination of the upper incisors.
•The amount of external apical root resorption is very small with light dissipating force.
•The produced external apical root resorption was less than 1 mm in both groups with slightly more in group B than group A.