1998 Volume 18 Issue 1 Pages 50-59
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 1995 to March 1996. The following results were obtained :
(1) The total number of crowns and fixed partial dentures produced were 1,135; among them, crowns totaled 922 (81.2%) and the fixed partial dentures, 213 (18.8%).
(2) Most of the crowns were full cast crowns (550, 59.7%); the second most commonly produced was porcelain fused to metal crowns (166, 18.0%), the third was resin faced cast crowns (149, 16.2%).
(3) Porcelain fused to metal crowns and resin faced cast 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 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 abutmentteeth) were most frequently treated in all regions.
(6) The crowns covered by the insurance dental service were 75.7%; the fixed partial dentures were 68.1%.
(7) Concerning the abutment teeth of the crowns, non-vital teeth were 88.5%, implant abutments were 2.2%; non-vital teeth of the fixed partial dentures were 67.3%, implant abutments were used this year for the first time to make the fixed partial dentures; concerning the bridges, implant abutments were 2.3%.
