Observations have been recorded since 2006 with restorations milled from Vita II (feldspathic), and e.maxCAD (lithium disilicate). The performance summary for these two materials are noted in the slides below. Observations with monolithic zirconia restorations and a resin-based material, 3M-ESPE Lava Ultimate, are in progress.
Bottom line, the e.maxCAD lithium disilicate (LS2) materials continue to provide outstanding results. Fracture was less than 1%, and overall complications (3.6%). LD2 outperformed the Vita II feldspathic ceramics. Both materials had complications. The critical note was the TYPE of complication between the two materials. The LS2 restorations needed a second cementation more often, while the feldspathic restorations fractured more often.
Molar restorations fabricated from Vita II materials tripled complications (mostly fractures).
Full coverage crowns in either material had twice as many overall complications as partial coverage restorations with either material. Complications included fractured restorations, loss of retention requiring re-cementation, recurrent caries, need for endodontics, and fractured roots.