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目的:观察和探讨瓷边缘对消除金属烤瓷冠颈缘灰线、提高美观的效果和方法。方法:采用瓷边缘技术制作50件镍铬合金金瓷冠,同期制作50件普通型镍铬合金金瓷冠,2年后临床观察两组颈缘灰线出现情况。结果:瓷边缘金属烤瓷冠无1件出现颈缘灰线,而普通金属烤瓷冠有8件出现颈缘灰线,两者差异有统计学意义(P<0.01)。结论:瓷边缘能有效消除镍铬合金金属烤瓷冠的颈缘灰线,提高美观效果。
OBJECTIVE: To observe and explore the effect and method of porcelain edge on eliminating the gray line on the margin of metal porcelain crown. Methods: Fifty nickel-chromium alloy porcelain crowns were made by porcelain edge technique. Fifty common nickel-chromium alloy porcelain crowns were made during the same period. Two years later, the occurrence of gray line on the cervical margin was observed. Results: None of the porcelain edge porcelain crowns showed a gray margin on the edge of the neck, while eight of the common porcelain crowns showed a gray margin on the edge of the neck. The difference was statistically significant (P <0.01). Conclusion: The edge of porcelain can effectively eliminate the gray line on the rim of Ni-Cr alloy metal porcelain crown and improve the aesthetic appearance.