Clinical examination of leucite-reinforced glass-ceramic crowns (Empress) in general practice: a retrospective study

Publikation: Forskning - peer-reviewTidskriftsartikel

Göran Sjögren ; Rolf Lantto ; A. Granberg ; BO Sundström ; Anders Tillberg

    • Umeå University, Department of Dental Materials Science
    • Umeå university
    • Umeå University, Department of Prosthetic Dentistry
    PURPOSE: The purpose of this study was to retrospectively evaluate leucite
          reinforced-glass ceramic crowns (Empress) placed in patients who regularly
          visit general practices. MATERIALS AND METHODS: One hundred ten Empress
          crowns, placed in 29 patients who visited a general practice on a regular
          basis, were evaluated according to the California Dental Association's
          (CDA) quality evaluation system. In addition, the occurrence of plaque and
          certain gingival conditions was evaluated. All crowns were luted with
          resin composite cement. The mean and median years in function for the
          crowns were 3.6 and 3.9 years, respectively. RESULTS: Based on the CDA
          criteria, 92% of the 110 crowns were rated "satisfactory." Eighty-six
          percent were given the CDA rating "excellent" for margin integrity.
          Fracture was registered in 6% of the 110 crowns. Of the remaining 103
          crowns, the CDA rating excellent was given to 74% for anatomic form, 86%
          for color, and 90% for surface. No significant differences (P > 0.05) were
          observed regarding fracture rates between anterior and posterior crowns.
          With regard to the occurrence of plaque and bleeding on probing, no
          significant differences (P > 0.05) were observed between the Empress
          crowns and the controls. CONCLUSION: Most of the fractured crowns had been
          placed on molars or premolars. Although the difference between anterior
          and posterior teeth was not statistically significant with respect to the
          fracture rates obtained, the number of fractured crowns placed on
          posterior teeth exceeded that of those placed on anterior teeth. The
          difference between the fracture rates may have clinical significance, and
          the risk of fracture has to be taken into consideration when placing
          crowns on teeth that are likely to be subjected to high stress levels.
    TidskriftInternational Journal of Prosthodontics
    Sidor (från-till)122-28
    StatusPublicerad - 1999