Marginal Bone Changes in Fixed All-on-Four Mandibular Prosthesis Using OT Bridge Attachment System

Multiunit abutments is considered a gold standard screw retained abutments. Multi-unit abutments are used to correct for varying heights among the implants, to establish a level restorative platform for the prosthesis, as well as to situate the implant connection even with or just below the gingival surface. Also they are used to correct the angulation of implants, helping to keep the screw access holes away from the facial surfaces of the restoration, and facilitate the path of insertion of prosthesis.

"The OT bridge attachment system introduced by (Rhein 83) is a global, well-established system used in the removable prosthetic protocols, the presence of seeger acetal ring placed between the sub-equatorial area of the OT Equator and the cylindrical Extragrade abutment compensates the space between the extragrade abutment and the OT equator attachment correcting the minor misalignments that produced during the prosthetic procedure and resulting in more passive fit."