title: [Influence of different types of posts and cores on color of IPS-Empress 2 crown].
abstract: OBJECTIVE
  To evaluate the influence of different types of posts and cores on the final color of the IPS-Emperss 2 crown.
  
  
  METHODS
  Five types of posts and cores (Cerapost with Empress cosmo, Cerapost with composite resin, gilded Ni-Cr alloy, gold alloy and Ni-Cr alloy) were made. The shifts in color of three points of IPS-Empress 2 crown surface (cervical, middle and incisal) with different posts and cores was measured with a spectroradiometer (PR-650).
  
  
  RESULTS
  The L* a* b* values of zirconium oxide and gilded Ni-Cr alloy posts and cores with ceramic crown were the highest. The L* a* values of zirconium oxide posts composite cores were higher while the b* values were lower. The L* a* b* values of Ni-Cr alloy were lower than that of gold alloy and were the lowest.
  
  
  CONCLUSIONS
  In combination with IPS-Empress 2 crown, zirconium oxide posts are suitable for routine use in the anterior dentition, and gilded Ni-Cr alloy and gold alloy posts and cores can be recommended for clinical practice. Ni-Cr alloy posts and cores can not be recommended for clinical practice.
authors: Key Laboratory of Oral Biomedical Engineering of Ministry of Education, Sichuan University, Chengdu, China.
authors: Dong-fang
authors: DF
authors: Li
authors: Jing-yuan
authors: JY
authors: Yang
authors: Xing-mei
authors: XM
authors: Yang
authors: Liu
authors: L
authors: Yang
authors: Qiang
authors: Q
authors: Xu
authors: Hong-yu
authors: HY
authors: Guan
authors: Qian-bing
authors: QB
authors: Wan
mesh_terms: D003116:Color; D003188:Composite Resins; D003442:Crowns; D003776:Dental Porcelain; D006801:Humans; D018020:Lithium Compounds; D011176:Post and Core Technique; D015040:Zirconium
chemical_list: D003188:Composite Resins; C118557:Empress 2; D018020:Lithium Compounds; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide