The aim of the current work is to estimate the impact of posterior maxillary intrusion on the surrounding bone intensity during correction of anterior open bite (AOB). The sample was 14 patients suffering from mild to moderate (3-5mm) anterior open bite with increased posterior maxillary vertical height. This study sample was allocated into two groups according to the corticotomy the approach. Buccal miniplates and palatal mini screws were used as skeletal anchorage for maxillary molars’ intrusion. The density of the alveolar bone related to right and left maxillary first permanent molars were measured 4.5 months after intrusion commencement. The study revealed that the alveolar bone density of right and left first permanent molars had statistically significant decreases. In the right side, buccal and palatal cortical density had statistically significant decrease, however it was non significant for left both cortical bone. Absolute molar intrusion could be attained by skeletal anchorage miniplates and mini screws in patients with frontal open bite malocclusion. The variation of bone intensity between buccal and palatal sides may account for the variance bone thickness changes after intrusion from the buccal to the palatal sides.

Aim of the study: To evaluate the vertical dimension change through the amount of molar intrusion after using modified vertical holding appliance (VHA) versus miniscrew. Subjects and methods: A sample of thirty six patients (32 females and 4 males) that presented with extruded upper molars and/or anterior open bite with age ranged from 17.6-26.4 years Group (1) VHA with mini screw (VHAMS) 12 patients (11 females and 1 male) , Group (2) molar intrusion with miniscrew only 12 patients (11 females and 1 male) , and Group (3) VHA without miniscrew 12 patients (10 females and 2 males), Lateral cephalometric X-ray view were taken before intrusion (T1), six months after the application of upper molar intrusive mechanics (T2) and six months after comprehensive orthodontic treatment (T3). Results: Significant increase in SNB, overbite in groups 1and 2, while there was a significant decrease in the angle of convexity, SN-MP, FMPA, LAFH, overjet, and open bite in groups 1 and 2, indicating improvement of the open bite and facial profile. Conclusion: Vertical Holding Appliances (VHA) and miniscrew-assisted intrusion can be effective in treating open bites or over-erupted maxillary molars. However, miniscrew-assisted intrusion often offers better control and predictability, leading to superior outcomes, particularly in cases of severe open bites.