Premium
Fracture resistance of all‐ceramic crowns placed on a preparation with a slice‐formed finishing line
Author(s) -
ÅKESSON J.,
SUNDH A.,
SJÖGREN G.
Publication year - 2009
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.2009.01962.x
Subject(s) - materials science , cubic zirconia , ceramic , composite material , yttrium , fracture (geology) , core (optical fiber) , oxide , metallurgy
Summary The purpose of this study was to determine the fracture resistance of all‐ceramic crowns with a core of a zirconia ceramic, using various stabilizing oxides and luted on a preparation with a slice‐formed finishing line. Ten cores made of HIPed yttrium‐oxide partially stabilized zirconia (HIPed Y‐TZP) and five cores of densely‐sintered magnesia partially stabilized zirconia (Mg‐PSZ) were made. The Mg‐PSZ cores and five of the HIPed Y‐TZP cores were made with a thickness of 0·2 mm. A further five cores 0·1‐mm thick were made of HIPed Y‐TZP. All 15 cores were then veneered with a feldspar ceramic and luted onto a stylized steel master die model with a slice‐formed finishing line. The specimens were then loaded until fracture occurred. The HIPed Y‐TZP specimens with the 0·2 mm core exhibited significantly higher fracture resistance than the Mg‐PSZ specimens ( P = 0·004) and the HIPed Y‐TZP specimens with the 0·1 mm core ( P = 0·001). The fracture resistance of the Mg‐PSZ specimens was significantly ( P = 0·015) higher than that of the HIPed Y‐TZP specimens with the 0·1 mm core. The fracture resistance determined was equal or superior to reported values for bite forces and all‐ceramic crowns. Thus, it seems likely that the type of restorations evaluated have the potential for successful use on a slice‐formed preparation. However, long‐term studies are essential in order to assess the performance of this ceramic system in a clinical context.