Clinical Evaluation of Posterior Hard Resin Crowns

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  • 臼歯部歯冠用硬質レジンクラウンの臨床評価

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We conducted clinical tests of Hybrid Ceramics (HCC-4S), a newly developed crown material, by observing the clinical course of patients immediately after placement, at one week and at three months.<br>       Forty-seven subjects, 10 males and 37 females, were selected from patients visiting the Fixed Prosthodontics Clinic at Osaka Dental University Hospital. The restoration sites included one anterior tooth, 22 premolars and 24 molars. Three of the patients had spontaneous pain, pain to cold water and pain to percussion in the abutment teeth. Although one had complained of sensitivity to cold water preoperatively, the symptoms disappeared upon restoration of the tooth. Symptoms in the other two cases were attributed to hypersensitivity throughout the oral cavity in one, and to postoperative pain secondary to infected root canal treatment in the other. The condition of the gingival margins generally improved after placement, with very few patients showing a worsening of the condition. Although occlusal wear of the crowns was almost nonexistent, shiny spots were noticed in two cases. Three of the crowns fractured, two during temporary fitting and one after placement. Although there was no attrition macroscopically of the opposing teeth, shiny spots were found in two patients.<br>       We concluded that the Hybrid Ceramic (HCC-4S) is appropriate for the coronal restoration of posterior teeth. It has excellent strength, biocompatibility and esthetic properties.

Journal

  • Shikaigaku

    Shikaigaku 57 (5), 378-402, 1994

    Osaka Odontological Society

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