Mandibular overdenture retained with precision balls and bar attachment

Abstract

Introduction. Milled precision bar with the lateral additions of two precision attachments could significantly contribute to the primary and secondary retention of partial denture and overdenture. This clinical case demonstrates stability of mandibular overdenture using milled precision bar and two coronally positioned precision attachments. Case report. A sixty-five years old male patient had two preserved canine roots in lower jaw. Semicircular metal-ceramic (PFM) bridge was previously fabricated for upper teeth. Decision for fabrication of milled bar and metal framework of overdenture was established due to the presence of PFM bridge in the upper jaw. The root canals of the two remaining mandibular canines were prepared for posts. After final mandibular impression using A-silicone in a custom tray, master cast with prepared canals of roots of canines was provided. Two posts connected with milled precision bar were designed. Coronal attachments-patrixs were positioned onto the tip of each coronal part of the construction with axial direction of precision attachments towards root canals. The construction was invested and casted. Metal framework of overdenture was designed and casted. After interocclusal record, the artificial anatomic teeth were selected and waxed model of overdenture with matrixes was provided for try-in clinical phase. Finally, the overdenture was flasked and polished. Metal construction of two posts and milled bar were cemented simultaneously with overdenture, using self-adhesive resin cement. Conclusion. Milled bar improves retention and stability of metal framework of overdenture. Coronally positioned patrix of attachment provides redirection of occlusal and other functional forces towards apical root parts.