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 2000 to March 2001.
The following results were obtained :
(1) The total number of crowns and fixed partial dentures produced were 1033; among them, crowns totaled 826 (80.0%) and fixed partial dentures, 207 (20.0%).
(2) Most of the crowns were full cast crowns (398, 48.2%); the second most commonly produced was resin-faced cast crowns (190, 23.0%); the third was porcelain-fused-to-metal crowns (187, 22.6%).
(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 58.5%; the antero-posterior region were 21.2%; the anterior region were 20.3%.
(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 71.1%; the fixed partial dentures were 64.3%.
(7) Concerning the abutment teeth of the crowns, non-vital teeth were 84.5%, implant abutments were 5.0%; non-vital teeth of the fixed partial dentures were 69.65%; implant abutments were 0.4%.
