Clinical Evaluation of Full Coverage Crowns Ten Years after Placement

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  • Shioyama Tsukasa
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Nagai Shigemi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Fujisawa Masanori
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Ishibashi Kanji
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Furukawa Kazutoshi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Itoh Sozo
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University

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Purpose : The goal of this study was to clarify the frequency and reasons for crown failure, based on the longevity and quality of full coverage crowns evaluated in 226 patients.<br>Materials and Methods : Of a total of 529 patients who received full coverage crowns between 1980 and 1987 at the student clinic, 226 (42.7%) responded to a request to attend a recall examination. The crowns were fabricated and delivered in a uniform way according to the students' clinical manual used in the Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University.<br>Results : The 226 participants (61 men and 165 women with a mean age of 41.6 years) attended a recall examination between 1996 and 1997. Periodontal pocket depth was 2.2±0.1 mm (mean±S.D.) at the initial examination and 2.2±0.8 mm (mean±S.D.) at the recall examination. The gingival index at the initial visit indicated that 90.3% of recall subjects had either slight gingival inflammation or none at all. A 10-16 year follow-up examination on the 388 crowns revealed that 38 crowns (9.8%) were lost or replaced due to periodontal disease, caries, and/or fracture. Of the failed crowns, 19 abutments were extracted, 11 crowns were removed and remade as an abutment of a fixed bridge, and 8 crowns were replaced by new crowns. The survival rates of the crowns at 5, 10 and 16 years after placement were 96.9, 93.3, and 84.9%, respectively.<br>Conclusion : Although the recall rate of this follow-up study was low, it is suggested that the periodontal status at the initial stage of treatment played an important role in achieving a high survival rate of the crown. Following an approved procedural manual together with a fabrication manual and careful checking by a senior instructor were also thought to contribute to the excellent survival rate of the crowns.

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