1994 Volume 14 Issue 4 Pages 378-386
The purpose of this study was to determine the statistical information concerning the crowns and the fixed partial dentures (total number, types and rate of crowns, number of vital or non-vital abutment teeth, etc.) made by the staff of the First Department of Prosthodontics, School of Dentistry, Showa University from April 1991 to March 1992.
The following results were obtained :
(1) The total number of crowns and fixed partial dentures produced were 1,116 ; among them 903 pieces (81%) were crowns, and the other 213 pieces (19%) were fixed partial dentures.
(2) Most of the crowns were the full cast crowns (553 pieces, 61.2%), secondly were the porcelain fused to metal crowns (253 pieces, 28.0%). However no resin faced cast crown was observed.
(3) Among the crowns for the anterior teeth, the porcelain fused to metal crowns were about three times as many as the jacket crowns. For the premolar teeth, the full cast crowns were about two and a half times as many as the porcelain fused to metal crowns. For the molar teeth, almost crowns were the full cast crowns.
(4) The placement of the fixed partial denture, about 60% restorations were located in the posterior region. Anterior and anterior-posterior region were about 20% to each.
(5) The relationship between the missing teeth and the abutment teeth of the fixed partial denture, the three-unit fixed partial dentures (one missing tooth with two abutment teeth) were most frequently treated
(6) The payment rate of the crowns by the insurance dental service was 68.8% and that of the fixed partial dentures was 68.1%.
(7) Concerning the abutment teeth of the crowns, 88.8% were non-vital teeth. Those rate of the fixed partial dentures were 67.7%.
