This prospective clinical trial aims to investigate the change of alveolar ridge width after immediate implantation using tow deferent techniques in expanding the alveolar ridge. In this study, 12 patients (9 female,3 male) with narrow alveolar ridges in the maxilla were treated. 20 dental implants were immediately installed after the expansion procedures of the selected narrow ridges , 10 implants with Bone Spreader technique , and 10 implants with Bone Splitting technique .