Int J Stomatol

Inter J Stomatol ›› 2011, Vol. 38 ›› Issue (3): 274-276.doi: 10.3969/j.issn.1673-5749.2011.03.007

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Evaluate color change of discolored tooth after restored with IPS-EMPRESS Ⅱ ceramics

QIAN Hai-xin, ZHANG Xiu-yin, YANG Dan-ling.   

  1. Dept. of Prosthodontics, The Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China; Shanghai Key Laboratory of Stomatology, Shanghai 200011, China
  • Received:2010-05-25 Revised:2011-03-14 Online:2011-05-20 Published:2011-05-20

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Abstract:

Objective The objective of this study was to evaluate the color change of discolored tooth after restored with IPS-EMPRESS Ⅱ ceramics. Methods 30 anterior tetracycline teeth were veneered and 30 anterior discolored teeth after root canal treatment were restored with full crowns. The ShadeEye-NCC color system was used to analyze the change in L, a and b. Then the chromatism[（ΔEab=（ΔL2+Δa2+Δb2）1/2）] as well as the value of Lab （ Lab=L）, Cab[（Cab=（a2+b2）1/2）] and Hab[（Hab=arctan（b/a）] were calculated. Results After veneered and crowned the teeth’s color had obviously changed. Additionally, there were some color changes of 60 teeth between before and after bonding. The average chromatism of the veneered teeth reached 2.37, and the Lab, Cab and Hab had statistical differences（P<0.05）. The average chromatism of the crowned teeth reached 1.36, and the Hab had statistical differences（P<0.05）. Conclusion The IPS-EMPRESS Ⅱ ceramics can effectively improve the color of discolored tooth. An appropriate bonding agent should be chosen to perfect the final results of the veneered tooth.

Key words: IPS-EMPRESS Ⅱ, porcelain veneer, all-ceramic crown, discolored tooth


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