Comparison of marginal adaptation, internal fitness and microleakage of Zolid, Zirconia and Empress 2 all-ceramic crown materials (An in vitro study)

Abstract

The purposes of this in vitro study were to compare the marginal adaptation,
internal fitness and the microleakage of three CAD-CAM all ceramic crowns
materials: Zolid, Zircon, and Empress 2. This study also evaluated the correlation of
microleakage of these ceramic crowns materials to the marginal fitness.
Forty-five maxillary first premolar teeth were prepared with 2-mm occlusal
reduction and 1-mm all around shoulder finish line, teeth were randomly divided into
three main groups according to the type of ceramic material that was used (n=15).
Group 1: received a CAD-CAM Ceramill Zolid® unilayered transparent zircon Group
2: received a CAD-CAM Ceramill ZI units (Zirconium oxide) Group 3: received a
CAD-CAM Ceramill wax units that would subsequently invested and heat pressed to
fabricate a hot-press ceramic crowns.
The results showed statistical significant difference in marginal fitness, internal
fitness and microleakage between Zolid group and other groups (P>0.0001). There
was highly significant correlation of the marginal and internal fitness, whilst there was
no significant correlation marginal fitness and microleakage.
,