Anchorage is a critical issue in orthodontics. The struggle to control anchorage can be one of the most challenging factors for an orthodontist during the course of treatment. Anchorage, if inadequate, can be the most limiting factor of therapy, no matter which technique or philosophy the clinician follows.The aim of this study was to evaluate the thickness and density of cortical bone of alveolar ridge.To evaluate the thickness and density of hard palate bone.To compare the thickness and density of cortical bone of alveolar ridge in different age group and to compare the thickness and density of hard palate bone in different age group