Comparative Study Between Autogenous Bone Block and Tent Pole Technique for Augmentation of Atrophic Anterior Maxilla

The goal of this clinical trial is to compare in patients with atrophied anterior maxilla, bone augmentation techniques ( gold standard bone block and tent pole technique). The main question it aims to answer is : Does screw tent pole technique provides better bone gain than autogenous bone block in atrophied anterior maxilla? * primary objective to assess amount of bone gain * secondary objective assess bone quality Participants will be randomly divided into two groups study group ( tent pole technique) and control group ( bone block) - each group will be followed up monthly for soft tissue dehiscence and after 6 month to assess bone gain and bone quality and then implant placement.