Long term clinical evaluation of conical crown retained dentures.

The conical crown was introduced by K.H. Körber more than twenty years ago, as a development of the well known telescopic crown. In combination with a removable denture, the conical crown has become widely used in Germany and Sweden, since the system enable modifications with maintained function if abutments are lost. All 78 patients treated with conical crown retained dentures, at the School of Dentistry, Dept. Prosthetic Dentistry, Lund University, 1983-1988, were included in a 40 month follow up study using the CDA quality evaluation system. More than 80% of the removable dentures and abutments were in function at the time of examination. Forty-four percent of the conical crown retained dentures were considered having acceptable quality while 56% were not acceptable, mainly due to caries at the abutments margins.