Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (51): 9621-9624.doi: 10.3969/j.issn.1673-8225.2011.51.028

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Effect of different manufacture techniques on the colour of gold alloy-porcelain crown’s incisal ridge

Liu Li1, Gu Wei-ping2   

  1. 1Oral Denture Development Center, Department of Prosthodontics; 2Oral Comprehensive Department, School of Stomatology, Nanjing Medical University, The Research Institute of Stomatology, Nanjing  210029, Jiangsu Province, China
  • Received:2011-06-06 Revised:2011-11-22 Online:2011-12-17 Published:2011-12-17
  • Contact: Gu Wei-ping, Oral Comprehensive Department, School of Stomatology, Nanjing Medical University, The Research Institute of Stomatology, Nanjing 210029, Jiangsu Province, China
  • About author:Liu Li, Technician in charge, Oral Denture Development Center, Department of Prosthodontics, School of Stomatology, Nanjing Medical University, The Research Institute of Stomatology, Nanjing 210029, Jiangsu Province, China

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Abstract:

BACKGROUND: The color, neck edge staining and the edge microleakage of high gold alloy-porcelain crowns is better than that of other alloy-porcelain crowns. However, many factors can influence the color of the restoration, and the manufacture has a greater impact on the aesthetic effect of all-ceramic crown restorations. 
OBJECTIVE: To study the effect of sintering process following body cut-back on the color of anterior gold alloy-porcelain crown’s incisal ridge.
METHODS: Gold alloy-porcelain crowns samples of 2M2 shade were fabricated by the DeguDent porcelain system. After body cut-back, samples of experimental group were sintered first then spread with enamel layer and sintered again, while the control group were directly spread with enamel layer and sintered. Compared with the 2M2 shade guide, the L＊, a＊, b＊ values were measured and color difference (△E) of two groups were obtained. The color changes were analyzed as well.
RESULTS AND CONCLUSION: The L＊ value of experimental group was the highest, and there were no significant difference to compare with shade guide (P > 0.05); The a＊ value of experimental group was higher than that of control group and shade guide obviously (P < 0.05); The b＊ value of shade guide was the highest and there were no significant difference to compare with other two groups (P > 0.05). The color difference between experimental group and shade guide was △E=0.39<1.5 and the color difference between control group and shade guide was △E=3.08>1.5, and the color difference between experimental group and control group was △E=3.88. The fabrication process of sintering following body cut-back can present better color of anterior gold alloy-porcelain crown’s incisal ridge. The color is much more similar to natural teeth.

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