Comparison of Split Box and Split Bone Block Techniques in Horizontal Ridge Augmentation

Horizontal alveolar ridge deficiencies may prevent the placement of dental implants and often require bone augmentation procedures before implant treatment. Two techniques commonly used for horizontal ridge augmentation are the Split Box Technique and the Split Bone Block Technique. This retrospective study included patients treated at Marmara University Faculty of Dentistry between January 2014 and January 2026. Radiographic records were reviewed to evaluate bone gain after augmentation and the stability of the augmented bone during long-term follow-up. Implant survival after prosthetic rehabilitation was also assessed. The purpose of this study was to compare the long-term outcomes of the Split Box Technique and the Split Bone Block Technique in terms of bone gain, bone stability, and implant survival.

Inclusion Criteria: * Age ≥18 years. * Patients with horizontal alveolar ridge deficiency requiring horizontal ridge augmentation before implant placement. * Patients treated with either the Split Box Technique (SBT) or Split Bone Block Technique (SBBT) at Marmara University Faculty of Dentistry between January 2014 and January 2026. * Availability of complete radiographic records, including CBCT scans obtained preoperatively (T0), 6 months after augmentation (T1), and during long-term follow-up after prosthetic loading (T2). * Availability of complete clinical records and follow-up data. Exclusion Criteria: * Incomplete clinical or radiographic records. * Patients lost to follow-up. * Presence of uncontrolled systemic diseases or conditions known to adversely affect bone healing. * Use of medications known to interfere with bone metabolism or healing. * Active infection at the augmentation site or complications that altered the planned treatment protocol.