Outcome measures were : implant success and survival rate , complications , horizontal and vertical alveolar bone dimensional changes measured on Cone Beam computed tomography ( CBCT ) scans at three levels localised 1 , 3 , and 5 mm below the most coronal aspect of the bone crest ( levels A , B , and C ) ; and between the palatal and buccal wall peaks ( level D ) ; and peri-implant marginal bone level changes measured on periapical radiographs .