6[2]Spiros OK,Outayas DDS,Matthias Kern.All-ceramic posts and cores:The state of the art,Quintessence International,1999,6(30):383-340.
7[3]Irfan Ahmad.Yttrium-Partially stabilized zirconium dioxide posts:An approach to restoring coronally compromised nonvital teeth,The International Journal of Periodontics & Restorative Dentistry,1998,5(18):455-465.
8[4]Mauro F,Augusto A.Clinical Experience With Empress Crowns.Int.Prosthodont,1997,10:241-247.
9[5]Murat Y,Daniel E,Oliver H.Ceramic abutments-A new era in achieving optima l esthetics in implant dentistry,The International Journal of Periodontics & Restorative Dentistry,2000,1(20):81-91.