This study was carried out to determine 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.) which were placed in the outpatients in the Department of Fixed Prosthodontics at Showa University Dental Hospital from April 1993 to March 1994.
The following results were obtained :
(1) The total number of crowns and fixed partial dentures produced were 1,202; among them, crowns totaled 1,022 (85.1%) and the fixed partial dentures, 180 (14.9%).
(2) Most of the crowns were full cast crowns (572, 56.0%); second were porcelain fused to metal crowns and resin faced cast crowns. The former decreased to 183 (17.9%). The latter steeply increased to 183 (17.9%).
(3) The resin faced cast crowns for the anterior teeth occupied approximately 70%. The full cast crowns for premolar teeth occupied approximately 50%. The full cast crowns for the molar teeth occupied approximately 90%.
(4) Fixed partial dentures located in the posterior region were about 60%; those in the anterior and the antero-posterior regions were about 20% each.
(5) With regard to 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 in the anterior and the posterior regions. The five-unit fixed partial dentures (two missing teeth with three abutment teeth) were treated in the antero-posterior regions.
(6) The crowns covered by the insurance dental service were 74.3% ; the fixed partial dentures ware 76.7%.
(7) Concerning the abutment teeth of the crowns, non-vital teeth were 88.8%, implant abutments were 0.9% ; non-vital teeth of the fixed partial dentures were 75.4%.
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