Aim of the study: The aim of this study was to evaluate bone loss around four immediately loaded implants using two different abutments OT bridge and mutli-unit abutments to support mandibular fixed-detachable prosthesis.
Materials and Methods: Four inter-foraminal mandibular implants, two axial anteriorly and two 30 degree tilted posteriorly, placed in 16 completely edentulous patients to immediately support fixed-detachable prosthesis opposing maxillary complete denture. Group I received OT bridge while group II received multi-unit abutments. Bone loss was evaluated immediately after loading, at 3, 6, and 12 months using CBCT for measurements.
Results: both groups demonstrated peri-implant crestal bone loss within the acceptable range but group I (OT Bridge) showed less bone resorption with significant statistical difference, no significant difference was observed between axial and 30-degree tilted implants. Bone loss was noticed higher from baseline and 3 months, then decreased in all other intervals.
Conclusion: OT Bridge showed great success, less peri-implant crestal bone resorption, Seeger rings gave extra means of retention. Within the limitations of this study, fixed- detachable mandibular all on 4 prosthesis using OT Bridge abutments is highly recommended.