Abstract:

BACKGROUND: As for patients candidate for porcelain complete veneer crown of posterior teeth but are unwilling to grind teeth, full metal edge porcelain crown is a better solution. However, there are many types of porcelain to metal, the performance of each material may affect human body to different degrees. The article aims to compare three kinds of commonly used materials, and to hopefully give clinicians a reference.
OBJECTIVE: To study the clinical application effects of three kinds of full metal edge porcelain to metal based on Ni-Cr alloy, Co-Cr alloy and high gold alloy for the repair of posterior teeth. 　
METHODS: A total of 150 full metal edge porcelain to metal in posterior teeth were prepared and then divided into 3 groups: Ni-Cr alloy group, Co-Cr alloy group and high gold alloy group. There were 50 crowns in each group. Two years later, gingival color and edge compactness were observed.
RESULTS AND CONCLUSION: The gingival color changes were high gold alloy group < Co-Cr alloy group < Ni-Cr alloy group. The edge compactness was the best in high gold alloy group, then Co-Cr alloy group and last Ni-Cr alloy group, but the latter two groups had no statistical significance. The high gold alloy is suggested to apply on full metal edge porcelain to metal, then Co-Cr alloy, and Ni-Cr alloy is not suggested.