Abstract
This study was carried out to determine statistical information concerning the crowns and the fixed partial dentures (total number, type and rate of crowns, number of vital or non-vital abutment teeth, etc.) which were placed in the outpatients in the Department of Fixed Prosthodontics at Showa University Dental Hospital from April 1998 to March 1999.
The following results were obtained;
(1) The total number of crowns and fixed partial dentures produced were 988; among them, crowns totaled 781 (79.0%) and fixed partial dentures, 207 (21.0%).
(2) Most of the crowns were full cast crowns (417, 53.4%); the second most commonly produced was porcelain-fused-to-metal crowns (153, 19.6%); the third was resin-faced cast crowns (152, 19.5%).
(3) Resin-faced cast crowns and porcelain-fused-to-metal crowns were most commonly used for the anterior teeth; full cast crowns and porcelain-fused-to-metal crowns, for the premolar teeth; full cast crowns, for the molar teeth.
(4) Fixed partial dentures located in the posterior region were 52.2%; the antero-posterior region were 25.1%; the anterior region were 22.7%.
(5) With regard to the relationship between the missing teeth and the abutment teeth of the fixed partial denture, three-unit fixed partial dentures (one missing tooth with two abutment teeth) were most frequently treated in all regions.
(6) The crowns covered by the insurance dental service were 74.6%; the fixed partial dentures were 67.1%.
(7) Concerning the abutment teeth of the crowns, non-vital teeth were 87.1% implant abutments were 2.4%; non-vital teeth of the fixed partial dentures were 67.8%; implant abutments were 2.3%.
