Abstract:

BACKGROUND: In recent years, porcelain materials applied in clinical practice are mainly complete crown, different kinds of porcelain substrate materials exhibiting adverse effect on the periodontium of abutment teeth has been attracting more and more attention, some periodontal inflammation problems such as gingival swelling and bleeding are becoming a focus.
OBJECTIVE: To evaluate the effect of three kinds of porcelain fused to metal crowns, including Ni-Cr alloy, precious metal and galvanized forming crowns/bridges, on periodontal health.
METHODS: According to the aspiration of the patient, 254 teeth from 78 patients were respectively restored by Ni-Cr alloy, precious metal and galvanized forming crowns/bridges. Follow-up visits were performed at one year postoperation, to compare the gingival color, sulcus bleeding index, plaque index and the change of periodontal probing depth.
RESULTS AND CONCLUSION: After 1 year, 21 teeth restored by Ni-Cr alloy porcelain fused to metal crowns showed the change of gingival color, but the effect of precious metal porcelain fused to metal crowns and galvanized forming crowns/bridges was little or no on gingival color. Cases restored by Ni-Cr alloy porcelain fused to metal crowns/bridges and precious metal crowns/bridges showed significant difference in sulcus bleeding index between pre- and post-restoration, while galvanized forming crowns showed no significant difference. There are no significant difference in three groups of the plaque index and periodontal probing depth between pre- and post-restoration. Results demonstrated that galvanized forming crowns/bridges have minimal effect on the health of periodontal tissue, then precious metal crowns/bridges, and Ni-Cr alloy porcelain fused to metal crowns/bridges maximal.