Introduction:The success of any orthodontic treatment depends on the anchorage control.The palatal area of maxilla with less anatomical structures, serves as an ideal site for the placement of the miniscrew. Aim:The purpose of this study is to compare the palatal bone thickness in different arch forms. Materials and Methods: CBCT scans of 84 subjects was selected and divided into late mixed(n=42) and permanent dentition(n=42) groups and further into square(n=14),ovoid(n=14) and tapered(n=14) arch forms. The measurements of palatal bone thickness were made at 24 sites using CareStream 3D Imaging software. Results: Bone thickness was higher in the anterior region than in the middle and posterior regions.Square arch forms had thicker bone than ovoid and tapered arch forms.Conclusion: Thus, determination of palatal bone thickness is considered to be a key factor which helps in the selection of implants and assessment of placement site for the successful orthodontic treatment.