Zirconia all-ceramic crown and porcelain fused to metal crown for dental defects: an 8-month follow-up of periodontal conditions

Hu Fang

doi:10.3969/j.issn.2095-4344.2015.30.008

Abstract：BACKGROUND:Zirconia al-ceramic crown restoration has good biocompatibility and corrosion resistance, and has little irritation to the human periodontal tissue. OBJECTIVE:To compare the clinical curative effects of zirconia al-ceramic and porcelain fused to metal crowns in the repair of dental defects. METHODS: Twenty patients (120 teeth) scheduled for crown lengthening+crown repair were enroled, including 7 males and 13 females, aged 19-60 years, and then randomly divided into observation group and control group. In the observation group, zirconia al-ceramic crown was used; and in the control group, porcelain fused to metal crown was used. Periodontal conditions, coordination of gingival margin height, and crown edge concealment were compared between the two groups at 8 months after restoration. RESULTS AND CONCLUSION: At 8 months after restoration, the observation group had better periodontal conditions and crown edge concealment than the control group (P < 0.05), and the time of wearing a temporary crown and recovery time were also shorter in the observation group than the control group (P < 0.05). There was no significant difference in the gingival margin height between the two groups at 1, 3 and 8 months after restoration. These findings indicate that after crown lengthening, the zirconia al-ceramic restoration for dental defect repair has better therapeutic effects than the porcelain fused to metal restoration, which can have better marginal adaptation, improve crown edge concealment, reduce gingivitis, decrease plaque adhesion ability, and preferably maintain the periodontal health.