Retention behavior of double-crown attachments with zirconia primary and secondary crowns.

Objective: To investigate whether adequate retention of zirconia conical crown (CC) attachments can be achieved, and to investigate their long-term retention.

Methods: Sixteen individual zirconia primary crowns were produced with convergence angles of 1° or 2° (eight of each). After determination of the convergence angles of the primary crowns, monolithic zirconia secondary crowns were manufactured.

[Endoscopic balloon dilatation of benign choledochal stenosis].

A 68-year-old woman was admitted because of septicaemia after cardiac valve replacement. Cause of the septicaemia was a proximal filiform common bile duct stenosis with recurrent gallstones and secondary cholangitis. A single pneumatic balloon dilatation widened the common bile duct.