 All patients will be treated with A bonded Hyrax a rapid palatal expander with an acrylic occlusal splint. The planned activation protocol consisted of 2 turns per day 0.25 mm per turn until the resolution of posterior cross bite with 2 to 3 mm overcorrection of expansion then tying off the jackscrew with a ligature wire and placing a smooth composite material over it. The initial CBCT scan T0 will be taken before cementation of the maxillary expander and again immediately after the end of the active expansion T1. First, all CBCT images will be oriented then the craniofacial suturesIntermaxillary Suture, Midpalatal Suture, Transpalatal Suture, Internasal Suture, Frontonasal suture, Zygomaticotemporal suture, Frontomaxillary suture, Zygomaticomaxillary suture, Nasomaxillary sutures, Spheno-occipital synchondrosis will be examined. Where the linear measurements will be carried out directly on the CBCT image using the OnDemand 3D Imaging software program. 