2000 Volume 20 Issue 1 Pages 52-61
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 nonvital abutment teeth, for example) that were placed in outpatients in the Department of Fixed Prosthodontics at Showa University Dental Hospital from April 1997 to March 1998.
The following results were obtained :
(1) The total number of crowns and fixed partial dentures produced were 1,019; among them, crowns totaled 826 (81.1%) and fixed partial dentures 193 (18.9%).
(2) Most crowns were full-cast (421, 51.0%); the second most commonly produced was resin-faced cast (196, 23.7%); the third was porcelain-fused-to-metal (131, 15.9%).
(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; and full-cast crowns for the molar teeth.
(4) Fixed partial dentures in the posterior region were 61.1%; in the antero-posterior region 23.8%; in the anterior region 15.0%.
(5) With regard to the relationship between missing teeth and 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 73.2%; the fixed partial dentures covered were 73.6%.
(7) Concerning the abutment teeth of the crowns, nonvital teeth were 83.7%; implant abutments 6.4%; nonvital teeth of the fixed partial dentures 74.4%; and implant abutments 0.6%.
