Evaluation of Accuracy of Computer Guided Versus Conventional Segmental Sandwich Osteotomy With Immediate Implant Placement in Vertically Deficient Anterior Maxilla

Inclusion Criteria: * Patients with vertically deficient anterior maxillary ridge a minimum 10 mm. height of alveolar bone. * Patients with medical history that did not hinder implant placement (uncontrolled diabetes) and adequate proper oral hygiene. * Patients of adequate alveolar bone width. * Both genders males and females will be included. Exclusion Criteria: * General contraindications to implant surgery. * Subjected to irradiation in the head and neck area less than 1 year before implantation. * Untreated periodontitis. * Poor oral hygiene and motivation. * Uncontrolled diabetes. * Pregnant or nursing. * Substance abuse. * Psychiatric problems or unrealistic expectations. * Severe bruxism or clenching. * Immunosuppressed or immunocompromised. * Treated or under treatment with intravenous amino-bisphosphonates. * Lack of opposite occluding dentition/prosthesis in the area intended for implant placement. * Active infection or severe inflammation in the area intended for implant placement. * Need of bone augmentation procedures at implant placement. * Unable to open mouth sufficiently to accommodate the surgical tooling. * Patients participating in other studies, if the present protocol could not be properly followed. * Referred only for implant placement or unable to attend a 5-year follow-up. * Requiring only single implant-supported crowns.